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Miscibility enhancing agents for improving oil recovery of CO2 flooding in low-permeability reservoirs:A study based on core displacement and nuclear magnetic resonance 认领 引用
1
作者 Chuan-Jie Ren Yong-Liang Yang +1 位作者 Hong-Jun Zhang Dao-Yi Zhu 《Petroleum Science》 SCIE EI CAS CSCD 2026年第6期3710-3720,共11页
CO2 miscible flooding is a key method to improve oil recovery.However,under most petroleum reservoir conditions,CO2 cannot achieve miscibility with crude oil.Therefore,reducing the minimum miscible pressure(MMP)... CO2 miscible flooding is a key method to improve oil recovery.However,under most petroleum reservoir conditions,CO2 cannot achieve miscibility with crude oil.Therefore,reducing the minimum miscible pressure(MMP)between CO2 and crude oil has become a critical objective.This study investigated MMP reduction and CO2 displacement efficiency of miscibility-enhancing agent(MEA)using low-permeability artificial cores and reservoir oil samples from the Xinjiang Oilfield.A core displacement method was established to determine the MMP and,in parallel,to screen four candidate MEAs.Nuclear magnetic resonance(NMR)technology was employed to probe the pore-scale mechanisms by which MEAs reduce the MMP between crude oil and CO2.Results showed that,before adding an MEA,the baseline MMP of CO2-crude oil system was 21.38 MPa.Among the four MEAs,tributyl citrate(TC)exhibited the strongest effect,lowering the MMP by 1.61 MPa.TC concurrently improved CO2 conformance efficiency in both large pores and small pores,improving oil recovery during CO2flooding.These results demonstrated that TC-enabled miscibility tuning offers a practical pathway to reduce MMP and improve CO2 conformance in low-permeability reservoirs.It provided a foundation for pilot-scale conformance control implementation in the Xinjiang Oilfield and analogous CO2 flooding reservoirs. 展开更多
关键词 CO2miscible flooding Miscibility enhancing agent(MEA) Core displacement Nuclear magnetic resonance(NMR) Minimum miscible pressure(MMP)
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Experimental investigation of surfactants and their ethanol blends for CO2–oil miscibility enhancement in CO2-EOR 认领 引用
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作者 Shu-Yang Liu Min-Feng Li +3 位作者 Jia-Yu Chen Ying Teng Peng-Fei Wang Jun-Rong Liu 《Petroleum Science》 SCIE EI CAS CSCD 2025年第10期4271-4281,共11页
As one promising CO2capture,utilization and storage(CCUS)technology,miscible CO2-enhanced oil recovery(CO2-EOR)significantly outperforms immiscible flooding in enhancing oil production and storing CO2.Howe... As one promising CO2capture,utilization and storage(CCUS)technology,miscible CO2-enhanced oil recovery(CO2-EOR)significantly outperforms immiscible flooding in enhancing oil production and storing CO2.However,achieving CO2miscible flooding is often hindered by the high minimum miscibility pressure of CO2-oil system in many reservoirs.To address this issue,this study focuses on the mechanisms for enhancing CO2-oil miscibility using different types of surfactants and their blends with ethanol.The effects of fatty alcohol polyoxyethylene ethers(EO),fatty alcohol polyoxypropylene ethers(PO),tributyl citrate(TC),and glyceryl triacetate(GT)on the CO2-oil miscibility pressure are quantitatively analyzed,as well as their synergy with ethanol.Results demonstrated that all tested surfactant additives reduce the CO2-oil miscibility pressu re.For ethe r-based surfactant additives,an increase in the degree of polymerization(CO2-philic groups)weakens the effectiveness to reduce miscibility pressure.Oxygen atoms in the functional group contribute more significantly to miscibility enhancement than carbon atoms.Among ester surfactants,GT achieved the best reduction effect of miscibility pressure(11.82%at 3.0 wt%),attributed to its symmetrical short side-chain structure and ester groups.Furthermore,ethanol exhibited a significant improvement for surfactants in enhancing miscibility.Notably,the reduction of CO2-oil miscibility pressure increases to 27.9%by 3.0 wt%GT blended with 5.0 wt%ethanol.These findings demonstrate that blending surfactants with ethanol is a feasible and effective strategy to facilitate miscible CO2flooding.This study provides valuable insights and practical guidance for the field implementation of miscible CO2-EOR. 展开更多
关键词 Carbon capture Utilization and storage(CCUS) CO2-EOR Miscibility pressure Surfactants Ethanol
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STUDY ON THE MISCIBILITY OF DYNAMICALLY VULCANIZED EPDM/PP BLEND BY POSITRON ANNIHILATION SPECTROSCOPY 认领 引用 被引量：4
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作者 Tao Jiang Xue-iang Jiang +3 位作者 Shi-yuan Cheng Yi-qun Dai Shao-jie Wang Bo Wang 《Chinese Journal of Polymer Science》 SCIE EI CAS 2000年第2期123-128,共6页
Positron annihilation spectroscopy(PAS)was utilized to investigate the relationship between the free-volume hole properties and miscibility of dynamically vulcanized EPDM/PP blend.The results showed that the noncrysta... Positron annihilation spectroscopy(PAS)was utilized to investigate the relationship between the free-volume hole properties and miscibility of dynamically vulcanized EPDM/PP blend.The results showed that the noncrystalline region of PP and EPDM in the blend was partially miscible and the miscibility of the blend became worse when the weight percent of EPDM was<50%.This was also demonstrated by DMTA and mechanical properties of the blends with various compositions. 展开更多
关键词 EPDM PP dynamic vulcanization miscibility PAS
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An improved correlation to determine minimum miscibility pressure of CO2–oil system 认领 引用 被引量：3
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作者 Guangying Chen Hongxia Gao +3 位作者 Kaiyun Fu Haiyan Zhang Zhiwu Liang Paitoon Tontiwachwuthikul 《Green Energy & Environment》 SCIE EI CAS CSCD 2020年第1期97-104,共8页
An accurate and reliable estimation of minimum miscibility pressure(MMP) of CO2-oil system is a critical task for the design and implementation of CO2 miscible displacement process.In this study,an improved CO2-oil MM... An accurate and reliable estimation of minimum miscibility pressure(MMP) of CO2-oil system is a critical task for the design and implementation of CO2 miscible displacement process.In this study,an improved CO2-oil MMP correlation was developed to predict the MMP values for both pure and impure CO2 injection cases based on ten influential factors,i.e.reservoir temperature(TR),molecular weight of C7+oil components(MWC7+),mole fraction of volatile oil components(xvol),mole fraction of C2-C4 oil components(xC2-C4),mole fraction of C5-C6 oil components(xCs-5-C6),and the gas stream mole fractions of CO2(yCO2),H2S(yH2S),C1(yC1),hydrocarbons(yHC)and N2(yN2).The accuracy of the improved correlation was evaluated against experimental data reported in literature concurrently with those estimated by several renowned correlations.It was found that the improved correlation provided higher prediction accuracy and consistency with literature experimental data than other literature correlations.In addition,the predictive capability of the improved correlation was further validated by predicting an experimentally measured CO2-Oil MMP data,and it showed an accurate result with the absolute deviation of 4.15%.Besides,the differential analysis of the improved correlation was analyzed to estimate the impact of parameters uncertainty in the original MMP data on the calculated results.Also,sensitivity analysis was performed to analyze the influence of each parameter on MMP qualitatively and quantitatively.The results revealed that the increase of xC2-C4,xC5-C6 and yH2 S lead to the decrease of MMP,while the increase of TR,MWC7+,xvol,yCO2,YC1,yHC and yN2 tend to increase the MMP.Overall,the relevance of each parameter with MMP follows the order of TR> xC5-C6> MWC7+> xvol> yH2 S> yHC> yCO2>yC1>yN2>xC2-C4. 展开更多
关键词 Minimum miscibility pressure Correlation CO2 miscible flooding Enhanced oil recovery
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Microstructure Evolution in a Rapidly Solidified Cu85Fe15 Alloy Undercooled into the Metastable Miscibility Gap 认领 引用 被引量：4
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作者 Jie HE Jiuzhou ZHAO 《Journal of Materials Science & Technology》 SCIE EI CAS 2005年第5期759-762,共4页
A model has been developed to describe the microstructure evolution in the atomized droplets of Cu-Fe alloy during cooling through the metastable miscibility gap.Calculations have been performed for Cu85Fe15 alloy to ... A model has been developed to describe the microstructure evolution in the atomized droplets of Cu-Fe alloy during cooling through the metastable miscibility gap.Calculations have been performed for Cu85Fe15 alloy to investigate the process of liquid-liquid phase transformation.The numerical results indicate that the minority phase droplets are nucleated in a temperature region around the peak of the supersaturation.The average radius of the Fe-rlch droplets decreases and the number density of the minority phase droplets increases with decreasing the atomized droplet size.The simulated results were compared with the experimental ones.The kinetic process of the liquid-liquid phase transformation was discussed in detail. 展开更多
关键词 Cu-Fe alloy Metastable miscibility gap Liquid-liquid phase transformation Microstructure evolution Modeling
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Impact of regio-isomeric monochlorinated end groups on packing mode,miscibility,and photovoltaic performance of asymmetric selenophene-fused M-series acceptors 认领 引用 被引量：1
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作者 Ruochuan Liao Changquan Tang +1 位作者 Yunlong Ma Qingdong Zheng 《Chinese Chemical Letters》 SCIE CAS CSCD 2023年第12期251-256,共6页
Optimal bulk-heterojunction(BHJ)morphology is crucial for efficient charge transport and good photovoltaic performance in organic solar cells(OSCs).Yet,the correlation between chemical structures of nonfullerene accep... Optimal bulk-heterojunction(BHJ)morphology is crucial for efficient charge transport and good photovoltaic performance in organic solar cells(OSCs).Yet,the correlation between chemical structures of nonfullerene acceptors(NFAs)and molecular interaction in the BHJ blends remains opaque.Herein,we study three isomeric NFAs referred to as MQ1-x(x=β,y,or 8)that shared an asymmetric selenophene-fused heteroheptacene backbone end-capped by two monochlorinated end groups.Remarkably,miscibility between the polymer donor of PM6 and MQ1-x successively elevates as the chlorine atoms move fromβ-,to y-,to 8-position of terminals.Combined with the varied molecular crystallinity of these NFAs,diverse BHJ morphologies are observed in their blend films.As a result,the MQ1-8-based devices present the highest PCE of 12.08%owing to the efficient charge dissociation and transport induced by the compact molecular packing and optimal BHJ morphology.Our investigation provides a new insight in the material design that has a good balance in molecular packing and film morphology for high-performance OSCs. 展开更多
关键词 Organic solar cells Miscibility Noncovalent interaction Chlorinated isomers Molecular packing
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Miscibility and Isothermal Crystallization of Poly(L-lactide) and Poly(trimethylene carbonate) Blends 认领 引用 被引量：1
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作者 赵丽芬 Jun Cheng +1 位作者 Xiu-juan Tian Ru-liang Zhang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2015年第3期499-507,共9页
Miscibility, isothermal crystallization kinetics, and morphology of poly（L-lactide）/poly（trimethylene carbonate） （PLLA/PTMC） crystalline/amorphous blends were studied by differential scanning calorimetry （DSC）... Miscibility, isothermal crystallization kinetics, and morphology of poly（L-lactide）/poly（trimethylene carbonate） （PLLA/PTMC） crystalline/amorphous blends were studied by differential scanning calorimetry （DSC） and optical microscopy （OM）. The heterogeneity of OM images and an unchanged glass transition temperature showed that PLLA was immiscible with PTMC. During isothermal crystallization, the crystallization rate of PLLA improved when the PTMC content was low （≤ 20%）. However, when the PTMC content was high （≥ 30%）, the crystallization rate decreased significantly. The reason of these nonlinear changes in crystal kinetics was analyzed according to the nucleation and growth process by virtue of a microscope heating stage. The isothermal crystallization morphologies of the blends were also studied by polarized optical microscopy and the results confirmed the conclusions obtained from crystallization kinetics. 展开更多
关键词 Poly（L-lactide） Poly（trimethylene carbonate） Miscibility Crystal kinetics.
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MISCIBILITY,CRYSTALLIZATION AND MECHANICAL PROPERTIES OF PPC/PBS BLENDS 认领 引用 被引量：14
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作者 Hui-liang Zhang Xiao-hong Sun Qing-yong Chen Min-qiao Ren Zhi-hao Zhang Hong-fang Zhang Zhi-shen Mo 《Chinese Journal of Polymer Science》 SCIE EI CAS 2007年第6期589-597,共9页
In this paper, melt blends of poly（propylene carbonate） （PPC） with poly（butylene succinate） （PBS） were characterized by dynamic mechanical analysis （DMA）, differential scanning calorimetry （DSC）, tensile t... In this paper, melt blends of poly（propylene carbonate） （PPC） with poly（butylene succinate） （PBS） were characterized by dynamic mechanical analysis （DMA）, differential scanning calorimetry （DSC）, tensile testing, wide-angle X-ray diffraction （WAXD）, polarized optical microscopy and thermogravimetric analysis （TGA）. The results indicated that the glass transition temperature of PPC in the 90/10 PPC/PBS blend was decreased by about 11 K comparing with that of pure PPC. The presence of 10% PBS was partially miscible with PPC. The 90/10 PPC/PBS blend had better impact and tensile strength than those of the other PPC/PBS blends. The glass transition temperature of PPC in the 80/20, 70/30, and 60/40 PPC/PBS blends was improved by about 4.9 K, 4.2 K, and 13 K comparing with that of pure PPC, respectively; which indicated the immiscibility between PPC and PBS. The DSC results indicated that the crystallization of PBS became more difficult when the PPC content increased. The matrix of PPC hindered the crystallization process of PBS. While the content of PBS was above 20%, significant crystallization-induced phase separation was observed by polarized optical microscopy. It was found from the WAXD analysis that the crystal structure of PBS did not change, and the degree of crystallinity increased with increasing PBS content in the PPC/PBS blends. 展开更多
关键词 Poly（propylene carbonate） Poly（butylene succinate） Miscibility Crystallization Mechanical properties.
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Miscibility and Crystallization of PHB/PMA Blends 认领 引用 被引量：1
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作者 Yu Xian AN Li Song DONG +2 位作者 Yu Gang ZHUANG Zhi Shen MO Zhi Liu FENG 《Chinese Chemical Letters》 SCIE CAS 1998年第6期587-590,共4页
The miscibility,crystallization behavior and morphological structure of PHB/PMA blends have been studied by the differential scanning calorimeter(DSC)and polarized optical microscopy(POM).The chemical repeat units of ... The miscibility,crystallization behavior and morphological structure of PHB/PMA blends have been studied by the differential scanning calorimeter(DSC)and polarized optical microscopy(POM).The chemical repeat units of the two components of the blend are isomers.The results indicate that PHB and PMA are miscible in the melt.The addition of PMA into PHB results in a depression in the spherulite growth rate of PHB.With increasing PMA content in the blends,the texture of PHB spherulite becomes more open. 展开更多
关键词 poly(beta-hydroxybutyrate) poly(methyl acrylate) isomer,miscibility
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Miscibility, Thermal Stability, Rheological and Mechanical Properties of Blends Derived from Polysulfone Oligomer and Poly (phthalazinone ether sulfone ketone) 认领 引用 被引量：1
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作者 GuimeiWANG XigaoJLAN +1 位作者 GongxiongLIAO LihaoWU 《Journal of Materials Science & Technology》 SCIE EI CAS 2004年第5期609-612,共4页
Poly (phthalazinone ether sulfone ketone) (PPESK) was melt blended with bisphenol-A polysulfone oligomer (O-PSF) to produce a thermoplastic polymer blends. The miscibility, thermal stability, rheological and mechanica... Poly (phthalazinone ether sulfone ketone) (PPESK) was melt blended with bisphenol-A polysulfone oligomer (O-PSF) to produce a thermoplastic polymer blends. The miscibility, thermal stability, rheological and mechanical properties of the blends were investigated by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and capillary rheometry. The blends showed single Tg over the composition range and possess homogeneous microstructure. The addition of O-PSF slightly affected the thermal properties of the blends. PSF oligomer, as a processing aid, could markedly improve the processability of the PPESK. In addition, the mechanical properties of the blends were increased, to some degree, by adding O-PSF. 展开更多
关键词 PPESK O-PSF Miscibility Thermal stability Rheology Mechanical properties
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Miscibility of Semi-flexible Thermotropic Liquid Crystalline Copolyesteramide with Polyamide 66 认领 引用 被引量：7
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作者 XIE Xiao-Lin, TJONG S. C. and LI R. K. Y. (Department of Chemistry, Huazhong University of Science and Technology, Wuhan 430074 Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong P. R. China) 《Chemical Research in Chinese Universities》 SCIE EI CAS 2000年第4期356-362,共7页
Liquid crystalline polymer-polyamide 66 (LCP/PA66) blends were compounded by using a Brabender mixing followed by compression moulding. The LCP employed was a semi-flexible liquid crystalline copolyesteramide based on... Liquid crystalline polymer-polyamide 66 (LCP/PA66) blends were compounded by using a Brabender mixing followed by compression moulding. The LCP employed was a semi-flexible liquid crystalline copolyesteramide based on 30% (molar fraction ) of p-amino benzoic acid (ABA ) and 70% (molar fraction) of poly (ethylene terephthalate) (PET). The LCP/PA66 blends were investigated in terms of the thermal and dynamic mechanical properties. It was found that PA66 and LCP components of the blends are miscible in the molten state, but are partially miscible in the solid state. The inclusion of the semi-flexible LCP into PA66 retards the crystallization rate of PA66. Furthermore, the melting temperature and the degree of crystallinity of PA66 are reduced considerably due to the LCP addition. 展开更多
关键词 Polyamide 66 Semi-flexible copolyesteramide Miscibility
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Study on the Miscibility and Phase Behavior of Polyoxymethylene with Novolak 认领 引用 被引量：2
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作者 Xiaodong WANG, Hangquan LI and Riguang JIN 《Journal of Materials Science & Technology》 SCIE EI CAS 2000年第4期427-430,共4页
The miscibility and phase behavior of the blends of polyoxymethylene (POM)/Novolak were investigated by the cloud point method, which showed that the POM/Novolak blends exhibited a lower critical solution temperature.... The miscibility and phase behavior of the blends of polyoxymethylene (POM)/Novolak were investigated by the cloud point method, which showed that the POM/Novolak blends exhibited a lower critical solution temperature. The melting point of POM decreased when diluted with Novolak. From the melting temperature depression of POM, a negative interaction parameter (x) between POM and Novolak was obtained. The IR spectrum revealed that the miscibility between POM and Novolak was caused by the specific interaction between the OH groups of Novolak and the ether oxygen atoms of POM. The morphology of the blends investigated by polarized light microscopy showed that the size of spherulites of POM was sharply decreased by its mixing with Novolak. This suggests that Novolak be used as a compatibilizer for POM. 展开更多
关键词 POM Study on the Miscibility and Phase Behavior of Polyoxymethylene with Novolak
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Effects of pressure on structure and dynamics of metallic glass-forming liquid with miscibility gap 认领 引用
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作者 Yun Cheng Peng-fei Wang +3 位作者 Chuan-xiao Peng Li jing Jia Yu-yang Wang Li Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2018年第6期666-673,共8页
The metallic liquid with miscibility gap has been widely explored recently because of the increasing plastic deformation ability of phase-separated metallic glass. However, the poor glass-forming ability limits its ap... The metallic liquid with miscibility gap has been widely explored recently because of the increasing plastic deformation ability of phase-separated metallic glass. However, the poor glass-forming ability limits its application as the structural materials due to the positive mixing enthalpy of the two elements. Since high pressure is in favor of the formation of the glass, the effect of pressure on the structural and dynamical heterogeneity of phase-separated CusoAgso liquid is inves- tigated by molecular dynamics simulation in the pressure range of 0-16 GPa. The results clearly show that the pressure promotes the formation of metallic glass by increasing the number of fivefold symmetry cluster W and dynamical relaxation time; meanwhile, the liquid-liquid phase separation is also enhanced, and the homogenous atom pAlrs show stronger interaction than heterogeneous atom pAlrs with increasing pressure. The dynamical heterogeneity is related to the formation of fivefold symmetry clusters. The lower growing rate of W at higher pressure with decreasing temperature corresponds to the slow increase in dynamical heterogeneity. The pressured glass with miscibility gap may act as a candidate glass with improved plastic formation ability. The results explore the structural and dynamical heterogeneity of phase-separated liquid at atomic level. 展开更多
关键词 Glass-forming liquid Miscibility gap High pressure Structural heterogeneity Dynamical heterogeneity Molecular dynamics simulation
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PRELIMINARY INVESTIGATION ON THE MISCIBILITY OF ISOTACTIC POLYPROPYLENE (iPP) AND SYNDIOTACTIC POLYPROPYLENE (sPP) BLENDS 认领 引用
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作者 Chun-xiao Zheng Xiu-qin Zhang +7 位作者 Joerg Rottstegge Xia Dong Ying Zhao Du-jin Wang Shan-nong Zhu Zhi-gang Wang Charles C. Han Duan-fu Xu 《Chinese Journal of Polymer Science》 SCIE EI CAS 2006年第6期569-573,共5页
Experimental miscibility studies were performed on different compositions of iPP/sPP blends, where sPP has a low syndiotacticity （[rrrr] = 81%）. Combining optical microscopy, rheology, and solid state NMR spectrosco... Experimental miscibility studies were performed on different compositions of iPP/sPP blends, where sPP has a low syndiotacticity （[rrrr] = 81%）. Combining optical microscopy, rheology, and solid state NMR spectroscopy, the miscibility of the blends was investigated at different scales in the traditionally thought to be ＂immiscible＂ iPP/sPP blends. For the composition of iPP/sPP （90/10） blend, it shows to be miscible in the melt, and furthermore, the existence of intermolecular chain interactions between sPP and iPP components was detected in the solid state. 展开更多
关键词 iPP/sPP blends Miscibility Optical microscopy Rheology Solid state NMR spectroscopy.
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Size Distribution and Anisotropy of the Minor Phase Droplets in Polypropylene/Ethylene-Octene Copolymer Blends: Effects of Shear and Component Miscibility 认领 引用
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作者 Cheng-zhen Geng Yan-ling Zhu +4 位作者 Guang-hui Yang 傅强 Chao-liang Zhang Ke Wang Tian-nan Zhou 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2014年第1期9-20,共12页
In this work, polypropylene （PP）/octene-ethylene copolymer （POE） blends were injection-molded using the so- called dynamic packing injection technique, which imposed oscillatory shear on the gradually cooling melt... In this work, polypropylene （PP）/octene-ethylene copolymer （POE） blends were injection-molded using the so- called dynamic packing injection technique, which imposed oscillatory shear on the gradually cooling melt during the packing solidification stage. In this way, the effect of shear on the size distribution and anisotropy of the minor phase droplets could be investigated. Besides, by using two kinds of POE with different octene contents, the effect of component miscibility was also studied. The results show that the droplet size is mainly determined by composition and miscibility, and droplet anisotropy is mainly determined by droplet size and shear. Most importantly, under the same processing condition, droplet anisotropy increases with droplet size, and there seems a linear fit between them, disregarding the miscibility factor. These results may provide guidance for preparing polymer blends with desired properties by tailoring their phase morphologies. 展开更多
关键词 Shear Miscibility Size distribution Anisotropy Phase morphology.
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Miscibility on blends of PVA and PFSA by viscometry 认领 引用
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作者 郎万中 许振良 +2 位作者 郭亚军 褚联峰 童蔚 《Journal of Shanghai University(English Edition)》 2009年第3期260-262,共3页
The intrinsic viscosity and viscometric interaction parameters of perfluorosulfonic acid （PFSA） and poly（vinyl alcohol） （PVA） were measured by dilute solution viscometry. The miscibility between PFSA and PVA was... The intrinsic viscosity and viscometric interaction parameters of perfluorosulfonic acid （PFSA） and poly（vinyl alcohol） （PVA） were measured by dilute solution viscometry. The miscibility between PFSA and PVA was estimated by the criteria of AB and μ. The results indicated that PFSA and PVA were completely miscible for any weight fraction in aqueous solution. 展开更多
关键词 miscibility dilute solution viscometry perfluorosulfonic acid （PFSA） poly（vinyl alcohol）（PVA）
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TIME-TEMPERATURE-MISCIBILITY AND MORPHOLOGY OF POLYOLEFIN BLENDS 认领 引用
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作者 RobertA.Shanks GandaraAmarasinghe 《Chinese Journal of Polymer Science》 SCIE EI CAS 2000年第3期263-270,共8页
Miscibility and crystallization have been studied for polypropylene-polyethylene and polyethylene-polyethyleneblends. In the case of the polypropylene blends the composition of interest is 20% polypropylene. At this c... Miscibility and crystallization have been studied for polypropylene-polyethylene and polyethylene-polyethyleneblends. In the case of the polypropylene blends the composition of interest is 20% polypropylene. At this composition thepolypropylene has been found to be soluble in linear low density polyethylene but insoluble in high, low and very lowdensity polyethylenes. The miscibility has been concluded from the crystallization kinetics and polarised optical microscopywith a hot stage. Polyethylene-polyethylene blends have been formed from polymers with similar average branching contentbut where they have different melting temperatures. Important consequences are to introduce long branches into apolyethylene that only has short branches, and to modify the morphology of a polyethylenes so that haze, gloss and strainhardening are improved. Polyethylene blends must be developed after careful consideration of the branch content anddistribution within each of the constituents. It is not sufficient to simply blend polyethylenes, with the desired range ofproperties, without regard to the miscibility of the blend composition. 展开更多
关键词 Polypropylene Polyethylene Blend Miscibility Thermal analysis Morphology Crystallization Melting
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THERMAL PROPERTY, MISCIBILITY AND CRYSTALLIZATION BEHAVIOR OF POLY(3-HYDROXYBUTYRATE-co-3-YDROXYHEXANOATE) AND POLY(BUTYLENE SUCCINATE-ADIPATE) (PHBHHX/PBSA) BLENDS 认领 引用
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作者 WANG Shufang GUO Tianying +3 位作者 TAO Jian ZHENG Chenggang ZHANG Banghua SONG Cunjiang 《Chinese Journal of Reactive Polymers》 2005年第1期1-7,共7页
Blends of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) and poly(butylene succinate-adipate) (PBSA), both biodegradable semicrystalline polyesters, were prepared with the ratio of PHBHHx/PBSA ranging from 80/... Blends of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) and poly(butylene succinate-adipate) (PBSA), both biodegradable semicrystalline polyesters, were prepared with the ratio of PHBHHx/PBSA ranging from 80/20 to 20/80 by melt mixing method. Differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), dynamic mechanical thermal analysis (DMA), polarizing optical microscopy (POM) and wide angle X-ray diffractometer (WAXD) were used to study the miscibility and crystallization behavior of PHBHHx/PBSA blends. Experimental results indicate that PHBHHx is immiscible with PBSA as shown by the almost unchanged glass transition temperature and the biphasic melt. 展开更多
关键词 Poly（3-hydroxybutyrate-co-hydroxyhexanoate）/poly（butylenes succinate-adipate） blends Thermal property Miscibility Crystallization.
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The impacts of gas impurities on the minimum miscibility pressure of injected CO_2-rich gas–crude oil systems and enhanced oil recovery potential 认领 引用 被引量：4
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作者 Abouzar Choubineh Abbas Helalizadeh David A.Wood 《Petroleum Science》 SCIE CAS CSCD 2019年第1期117-126,共10页
An effective parameter in the miscible-CO_2 enhanced oil recovery procedure is the minimum miscibility pressure(MMP)defined as the lowest pressure that the oil in place and the injected gas into reservoir achieve misc... An effective parameter in the miscible-CO_2 enhanced oil recovery procedure is the minimum miscibility pressure(MMP)defined as the lowest pressure that the oil in place and the injected gas into reservoir achieve miscibility at a given temperature. Flue gases released from power plants can provide an available source of CO_2,which would otherwise be emitted to the atmosphere, for injection into a reservoir. However, the costs related to gas extraction from flue gases is potentially high. Hence, greater understanding the role of impurities in miscibility characteristics between CO_2 and reservoir fluids helps to establish which impurities are tolerable and which are not. In this study, we simulate the effects of the impurities nitrogen(N_2), methane(C_1), ethane(C_2) and propane(C_3) on CO_2 MMP. The simulation results reveal that,as an impurity, nitrogen increases CO_2–oil MMP more so than methane. On the other hand, increasing the propane(C_3)content can lead to a significant decrease in CO_2 MMP, whereas varying the concentrations of ethane(C_2) does not have a significant effect on the minimum miscibility pressure of reservoir crude oil and CO_2 gas. The novel relationships established are particularly valuable in circumstances where MMP experimental data are not available. 展开更多
关键词 EOR exploiting impure flue gases CO2–crude oil minimum miscibility pressure(MMP) Impact of gas impurities on MMP
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STUDIES ON MISCIBILITY OF POLY (ε-CAPROLACTONE) AND ALIPHATIC POLYCARBONATE BLENDS AND DETERMINATION OF THEIR INTERACTION PARAMETER 认领 引用 被引量：1
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作者 陈利 黄玉惠 +1 位作者 宋默 丛广民 《Chinese Journal of Polymer Science》 SCIE EI CAS 1992年第4期294-298,共5页
In this paper the miscibility of poly (ε-caprolactone) (PCL) and aliphatic polycarbonate (APC) is studied by using DSC. The results show that PCL and APC are miscible in all ranges of composition. The interaction par... In this paper the miscibility of poly (ε-caprolactone) (PCL) and aliphatic polycarbonate (APC) is studied by using DSC. The results show that PCL and APC are miscible in all ranges of composition. The interaction parameter between the polymers is calculated from the melting point depression data. Using optical microscope, the shapes of the PCL spherulites in the blends are observed. 展开更多
关键词 Blend Miscibility PCL Aliphatic Polycarbonate
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