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介电性能研究表明,硅橡胶和以四氟乙烯/丙烯/1,1二氟乙烯三元共聚物为基料的氟橡胶的共混胶中,两相是不溶混的。随着氟橡胶相在共混胶组成物中含量的增加,介电损耗因子在任何温度下都会增加。氟橡胶中1,1二氟乙烯链段的松弛活化能受组成物中硅橡胶的影响,硅橡胶的含量越高,氟橡胶中含氟链段的活化能越高。共混胶中的界面极化与氟橡胶分散在硅橡胶基质中的含量多少有关,氟橡胶分散性越好,极化度越高。当共混胶中的硅橡胶与氟橡胶之比为75/25时,共混胶的介电常数比纯硅橡胶的高,同时亦提高了1,1二氟乙烯链段自由旋转的能障,导致最大的偶极松弛活化能产生。
Dielectric properties studies show that the two phases are immiscible in a blend of silicone rubber and fluororubber based on a tetrafluoroethylene / propylene / vinylidene fluoride terpolymer. As the fluoroelastomer phase increases in the blend composition, the dielectric loss factor increases at any temperature. The relaxation activation energy of the vinylidene fluoride segment in the fluororubber is affected by the silicone rubber in the composition. The higher the content of the silicone rubber, the higher the activation energy of the fluorine-containing segment in the fluororubber. The interfacial polarization in the blends is related to the content of the fluororubber dispersed in the silicone rubber matrix. The better the dispersibility of the fluororubber is, the higher the polarization degree is. When the ratio of silicone rubber to fluororubber in the blend is 75/25, the dielectric constant of the blend is higher than that of pure silicone rubber, and at the same time, the vinylidene fluoride segment is free to rotate , Resulting in the largest dipole relaxation activation energy.