论文部分内容阅读
从聚硅烷(PS)与钛酸丁酯(Ti(OBu)_4)出发,不用任何反应促进剂直接合成了含 Ti 的 SiC 纤维的先驱体聚钛碳硅烷(PTC—Ⅲ)。在这一反应中,PS 裂解为含 Si—H 键的低分子聚硅烷(LPS)。LPS 的的 Si—H 键与 Ti(OBu)_4反应并伴随着发生 Si-Si 骨架向 Si—C 骨架的转化。从 PTC—Ⅲ出发已制得了有良好力学性能的含 Ti 的 SiC 纤维。本文研究了 PS 与 Ti(OBu)_4的反应及其对 PTC 特性的影响。
Starting from polysilane (PS) and butyl titanate (Ti (OBu) _4), a precursor polytitanium carbosilane (PTC-Ⅲ) containing Ti and SiC fibers was synthesized without any reaction promoter. In this reaction, PS is cleaved to Si-H bond-containing low-molecular polysilane (LPS). The Si-H bond of LPS reacts with Ti (OBu) 4 and accompanies the conversion of the Si-Si framework to the Si-C framework. Starting from the PTC-Ⅲ have been prepared with good mechanical properties of Ti-containing SiC fibers. In this paper, the reaction of PS with Ti (OBu) 4 and its effect on the PTC characteristics were studied.