Backbiting-minimized synthesis of fluorosilicone copolymers with promoter by anionic ring-opening polymerization

摘要: A back-biting reaction in fluorosilicone synthesis can compromise its precision–manufactured mechanical properties and deteriorate its molecular properties. This phenomenon can potentially disrupt the intricate structure of fluorosilicone, diminishing its durability and altering its properties over time. Cyclosiloxane with methyl and vinyl groups was added to overcome the limited properties of poly[methyl(trifluoropropyl)siloxane] and conventional rubber for harnessing versatile materials, such as vehicles and spacecraft. In this study, dimethyl carbonate, diethyl carbonate, and allyl methyl carbonate were used as promoters to suppress back-biting reactions, and an improved fluoro-vinyl-methyl silicone (FVMQ) was synthesized. 29Si nuclear magnetic resonance (NMR) spectroscopy showed that the cyclic by-products from the back-biting reaction were inhibited by adding carbonate materials. Moreover, the conversion …