PDMS直接裂解重排合成PCS

Direct Synthesis of PCS from PDMS

聚二甲基硅烷 (PDMS)高温裂解制备的聚碳硅烷 (PCS)是陶瓷材料的良好先驱体。本文在现有液态聚硅烷 (LPS)间接合成PCS工艺的基础上 ,直接由固态PDMS高温裂解重排制备PCS ,利用正交设计的方法研究了不同合成条件对PCS结构、分子量及分子量分布的影响 ,得出了最佳合成条件 ,即反应温度 45 5℃ ,裂解温度 5 40℃ ,保温时间 6h。

Polycarbonsilane (PCS) synthesized from polydimethelsilane (PDMS) is an excellent precursor to ceramic materials. On the base of an indirect way involving intercurrent liquid polysilane (LPS), this paper studied a direct way to synthesis PCS from solid PDMS. By the application of orthogonal design, influence of synthesis conditions on the structure and molecular weight of PCS were studied. And the optimized synthesis condition was obtained as reaction temperature, 455℃, pyrolysis temperature, 540℃ and retaining time, 6 hours.