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Confined Crystallization Behaviors of Cross-linked comb-like Copolymers

Chinese Journal of Polymer Science 2016年第8期34卷 1039-1046页

作者： Xian-jing Gong 施德安 Ying-kui Yang Tao Jiang Yan-feng Meng Robert K.Y.Li 蒋世春 School of Materials Science andEngineering Tianjin UniversityTianjin 300072China Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Collaborative Innovation Center for Advanced Origanic Chemical MaterialsFaculty of Materials Science and EngineeringHubei UniversityWuhan 430062China School of Chemistry and Materials Science Ludong UniversityYantai 264025China Department of Physics and Materials Science City University of Hong KongHong KongChina

Cross-linked PEG-based copolymers were obtained via synthesis of polyethylene glycol （PEG） and methoxy polyethylene glycol （MPEG） by the bridging and/or cross-linking agent of 2,4-tolylene diisocyanate （TDI） and/or hexamethylene-l,6-diisocyanate homopolymer （HDI trimer）. The effects on the crystallization behaviors of the samples could be found with the changes in molecular weight of MC-PEG and molecular weight of SC-PEG in certain cross-linked density. It is revealed that the samples appear not to crystallize when the molecular weight of MC-PEG and SC-PEG are 1000 g/mol or less than that. The samples begin to crystallize when the molecular weight of either MC-PEG or SC-PEG reaches 2000 g/mol. The crystallinity of crystallized MC-PEG decreases with the increasing molecular weight of uncrystallized SC-PEG and the crystallinity of crystallized SC-PEG declines with the rise of molecular weight of uncrystallizable MC-PEG. The chains of SC-PEG （M_n = 2000 g/mol） can fold and align easilier than those of MC-PEG （M_n = 2000 g/mol）, when the content of PEG is the same.

关键词： PEG-based copolymers Cross-linking comb-like Confined crystallization behavior.

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Synthesis and Solution Properties of comb-like Acrylamide Copolymers

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Journal of Wuhan University of Technology(Materials Science) 2012年第6期27卷 1105-1109页

作者：罗霄 BAI Lei ZA Kejian LI Dongwen HAN Wei PU Xiaolin School of Petroleum Engineering Southwest Petroleum UniversityChengdu 610500China Research Institute of Petroleum Exploration and Development Xinjiang Oilfield CompanyPetroChinaKaramay 834000China Tarim Oilfield Company Korla 841000China

A comb-like acrylamide copolymer （HCJ-1） was synthesized by using aqueous free radical polymerization of acrylamide （AM） as main monomer and ether carboxylate as functional monomer. The copolymers were characterized with FT-IR and SEM. The SEM results show that the molecular structure of copolymer is extended in salt water. It is proved that the copolymer shows good salt *** solution properties of HCJ-1 were studied and compared with those of partially hydrolyzed polyacrylamide （HPAM）. The experimental results show that the obtained HCJ-1, compared with HPAM, exhibits a dramatic enhancement in the salt-resistant properties. The apparent viscosity retention rate of 1.5 g/L HCJ-1 aqueous solution and salt solution after 180 days at 60 ℃ are 70.6% and 64.5%, respectively, exhibiting good thermal stability. In addition, HCJ-1 solution also displays the excellent shearing resistance. In a word, the experimental results show the HCJ-1 is a promising profiling agent for high salinity reservoir.

关键词： comb-like salt resistance thermal stability sheafing resistance

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