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Improved synthesis and properties of hydroxyl‐terminated liquid fluorosilicone
Author(s) -
Zhang GuoDong,
Hu YingQian,
Wu JiRong,
Li JiaYun,
Lai GuoQiao,
Zhong MingQiang
Publication year - 2016
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.43220
Subject(s) - polymerization , siloxane , polymer chemistry , chemistry , polymer , organic chemistry
The synthesis of hydroxyl‐terminated poly(trifluoropropylmethyl)siloxane (PTFPMS‐OH) by anionic ring‐opening polymerization of 1,3,5‐tris(trifluoropropylmethyl)cyclotrisiloxane (D 3 F) was studied in bulk using potassium hydroxide as an initiator in the presence of several reaction stabilizers. The promoting effect of the reaction stabilizers for the polymerization of D 3 F was investigated by GPC and NMR analyses. Results showed that the selected reaction stabilizers exhibited a significant promoting effect. This new process of polymerization produced well‐defined α,ω‐dihydroxylated polysiloxane in very high yields. The addition of reaction stabilizers could almost completely suppress back‐biting reactions during the polymerization. It was found that there lies an exponential decay relationship between the molecular weight of PTFPMS‐OH and amount of end‐capping agent. Thus, by adjusting the reaction conditions strictly, the molecular weight of the fluorosilicone could be controlled accurately, and meanwhile a broad “terminate window” could be implemented. Thermogravimetic (TG) analysis indicated that PTFPMS‐OH could be used in a wide range of operational temperatures. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43220.