氟硅氧烷-二甲基硅氧烷共聚物低温性能的研究

Study on the Properties of Methyl(3,3,3Trifluoropropyl)Siloxanedimethyl Siloxane Copolymer

研究了三氟丙基甲基硅氧烷／二甲基硅氧烷共聚物的性能，尤其是其低温特性，并与通用氟硅橡胶进行了对比。实验结果表明该共聚物有较好的耐油性能和优异的低温性能。共聚物在－６０℃下的压缩耐寒系数为０．７３，而通用氟硅橡胶仅为０．０３。共聚物在－７０℃下的压缩耐寒系数仍达０．５９。ＤＭＴＡ分析也表明共聚物的损耗模量峰在－８４．４℃，通用氟硅橡胶在－６２．４℃，共聚物比通用氟硅橡胶具有更好的低温性能。

The properties of methyl(3,3,3trifluorpropyl)siloxanedimethyl siloxane copolymer has been investigated in this paperThe coefficient of coldresistance for the copolymer under compression is 073 at -60 and 059 at -70,while fluorosilicone rubber is 012 at -55 and 003 at -60The glass transition temperature( Tg) of the copolymer is 844,while that of fluorosilicone rubber is -624 determined by loss modulus of DMTA