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Strain-crystallizing poly(methyl(3,3,3-trifluoropropyl)-siloxane) elastomers and methods for making
Strain-crystallizing poly(methyl(3,3,3-trifluoropropyl)-siloxane) elastomers and methods for making
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机译:应变结晶聚(甲基(3,3,3-三氟丙基)-硅氧烷)弹性体及其制备方法
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摘要
Strain-crystallizing poly{methyl(3,3,3-trifluoropropyl)siloxane} elastomers and methods for their making are dislosed. The process comprises the cross-linking of cis stereoregular polymers prepared by reacting isomers of 1,3,5-trimethyl-1,3,5-tris(3',3',3'-trifluoropropyl)cyclotrisiloxane, where at least 30 percent of the isomers are of cis configuration, in the presence of an aprotic polar promoter and a lithium compound. The lithium compound initiates ring opening and polymerization of the isomers without effecting the steric arrangement of the isomers. Elastomers prepared by cross-linking these cis stereoregular polymers have sufficient cis 3,3,3-trifluoropropyl substitution to allow the elastomers to strain crystallize and provide reinforcement to the elastomers at typical use temperatures.
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