文献类型：期刊文献

英文题名：Preparation of Fluorosilicone Random Copolymers with Properties Superior to Those of Fluorosilicone/Silicone Polymer Blends

作者：Xu, Xiang[1];Xu, Zhixin[1];Chen, Pei[1];Zhou, Xiaodong[2];Zheng, Anna[1];Guan, Yong[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：25

期号：5

起止页码：1267

外文期刊名：JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS

收录：;EI(收录号：20152600968287);WOS:【SCI-EXPANDED(收录号:WOS:000359536800029)】；

基金：The research was supported by Shanghai Leading Academic Discipline Project (B502) and Shanghai Key Laboratory Project (08DZ2230500). Support from FSIR Advanced Material Co., Ltd. is also gratefully acknowledged.

语种：英文

外文关键词：Fluorosilicone; Copolymer; Polycondensation; Oil resistant

摘要：Copolymers of poly(dimethylsiloxane-methyltrifluoropropylsiloxane-methylvinylsiloxane) (P(DMS-MTFPS-MVS) or PDFV) were prepared by co-polycondensation of dimethylsiloxanediol, methyltrifluoropropylsiloxanediol and methylvinyldiethoxysilane using potassium silanolate as a catalyst. The characterization results obtained from gel permeation chromatography, H-1 NMR spectroscopy, Si-29 NMR spectroscopy and dynamic mechanical analysis indicated that PDFV copolymers possessed a higher molecular weight and exhibited a more uniform distribution of methyltrifluoropropylsiloxane (MTFPS) units along the polymer chain than the copolymers prepared by ring-opening copolymerization. The solubility parameters (delta) of PDMS, PMTFPS and PDFV were determined by measuring the maximum degree of swelling (Q (max)) in solvents with different delta values. The mechanical property, phase structure and oil resistance of PDFV copolymers and PDMS/PMTFPS blends were compared. The results indicated that the PDMS/PMTFPS blends exhibited serious phase separation, leading to a pronounced drop in the tensile strength. However, the homogeneous PDFV compounds with various amounts of the MTFPS unit exhibited good mechanical properties. In addition, the copolymers exhibited much better oil resistance than the blends did in engine oil and IRM 903 test oil. However, the blends exhibited better fuel resistance than the copolymers when the amount of the MTFPS unit was less than a certain value related to the delta of the fuel.