摘要
选择适当分子量的低分子量聚碳硅烷与Al（AcAc）3在自制常压高温合成装置中合成了含铝碳化硅纤维的先驱体——聚铝碳硅烷（polyaluminocarbosilane,PACS）.并对PACS进行了软化点测试、傅立叶红外光谱（FT-IR）分析、凝胶渗透色谱（GPC）测试、元素分析以及可纺性研究.由中等分子量聚碳硅烷为原料合成出的软化点为194.8～220.1,Si-H键含量为0.857,数均分子量为2353,分子量分布呈“双峰”分布的PACS,经熔融纺丝得到了直径为5μm、表面光滑、直径均匀的原丝,表现出了优异的纺丝性能.
As the SiC-based ceramic precursor polymer, polyaluminocarbosilane （PACS） was synthesized via the reaction of low-molecular-weight polycarbosilane （LPCS） with Al（AcAc）3 in the self-made reactor under normal pressure and at high temperature. PACS was characterized by softening point test, Fourier transform-infrared radiation （FT-IR）, gel permeation chromatograms （GPC） and chemical analysis. PACS prepared from the moderate-molecular-weight polycarbosilane, which has a melting-point of 194.8 - 220.1, Si-H content of 0.857, number average molecular weight of 2353 and the molecular-weight distribution with ＂double-peak＂, showed excellent spinnability. The green PACS fibers prepared had smooth surface and homogeneous diameter distribution with the diameter of 5μm.
出处
《高技术通讯》
CAS
CSCD
北大核心
2007年第9期943-947,共5页
Chinese High Technology Letters
基金
国家自然科学基金（50532010）和国防科技重点实验室基金（5148802-0104SH0201）资助项目.
关键词
含铝聚碳硅烷
先驱体
纺丝性
碳化硅纤维
polyaluminocarbosilane, precursor, spinnability, silicon carbide fiber
