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Research on Preparation and Thermal Properties of High Molecular Weight Fluorosilicone Rubber

Wang Qiongyan;Gan Tengfei;Wu Yinan;Zhang Qinghua;Zhan Xiaoli;Chen Fengqiu;Zhejiang Sucon Silicone Co.,Ltd;Department of Chemical and Biological Engineering, Zhejiang University;  
A series of fluorosilicone rubber with 0.25% vinyl content and different relative molecular mass was prepared with 1,3,5-Tris[(3,3,3-trifluoropropyl)methyl]cyclotrisiloxane(D3F) and 1,3,5-trivinyl-1,3,5-trimethylcyclotrisiloxane(D3Vi) as raw materials, and alkali as catalyzer. D3Vicould bring vinyl group into the copolymer, and the polymerization rate of D3F was very high, the monomer conversion achieved more than 90 percent in ten minutes. The study optimized polymerization conditions, the structure and relative molecular mass of polymers were investigated by FTIR,1H-NMR, GPC, and the thermal performance was studied through DSC and TG. The results suggested that the glass transition temperatures of fluosilicone rubber was-69 ℃, and it did not reveal significant thermal degradation phenomena in the less than 300 ℃, the high-temperature resistance was lower than general methyl vinyl silicone rubber.
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