苯基硅橡胶的合成及动态黏弹性能

Synthesis and dynamic viscoelasticities of phenyl silicone rubber

以八甲基环四硅氧烷和甲基苯基硅氧烷环体作原料,采用负离子开环聚合法在不同反应温度下制备出5种苯基硅橡胶,通过傅里叶变换红外光谱、差示扫描量热法、核磁共振波谱、热失重及凝胶渗透色谱等对其结构及性能进行了表征测试,并用旋转流变仪研究了其动态黏弹性能。结果表明,制备苯基硅橡胶的最佳反应温度宜为95 ℃,在此温度下得到的苯基硅橡胶具有良好的形状恢复能力及能量吸收能力。此类苯基硅橡胶具有较低的玻璃化转变温度,且热分解温度均在300 ℃以上,耐高低温性能优异,在缓冲减振等领域具有较好的应用价值。

Using octamethylcyclotetrasiloxane and methylphenylsiloxane ring as raw materials, five different phenyl silicone rubbers were prepared by anionic ring-opening polymerization at different temperatures, and their structures and properties were characterized by Fourier transform-infrared spectroscopy, differential scanning calorimetry, proton nu-clear magnetic resonance spectroscopy, thermogravimetric analysis and gel permeation chromatography. The dynamic viscoelastic properties of phenyl silicone rubbers at different test frequencies and amplitudes were characterized by an integrated rheometer. The results showed that the optimum reaction temperature of the phenyl silicone rubber was 95 ℃, and the phenyl silicone rubber obtained at this temperature had excellent shape recovery ability and energy absorption capacity. Such phenyl silicone rubber had a low glass transition temperature and a decomposition temperature of more than 300 ℃. It was excellent in high and low temperature resistance, which was suitable for shock absorption and other related fields in complex environment.