Study of Preceramic Polymers

✍ Scribed by Ping Peng; Yi Lu; Xiuying Liu; Chunxiang Feng

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 125 KB
• Volume: 53
• Category: Article
• ISSN: 0026-265X
• DOI: 10.1006/mchj.1996.0041

✦ Synopsis

In the synthetic process of a preceramic polymer, polycarbosilane, a partly decomposed polydimethylsilane was used as the starting material. The low-molecular-weight condensates in a reflux condenser were analyzed on-line using GPC, IR, UV, and refractometry. The condensates are generally composed of three structural units:-Si(CH 3 ) 2 -(or PS),-Si(CH 3 ) 2 -Si(CH 3 ) 2 -(CH 2 )-SiH(CH 3 )-Si(CH 3 ) 2 -(or C-PS), and-[Si(CH 3 ) 2 -CH 2 -] 3 -[SiH(CH 3 )-CH 2 ] 2 -(or PC). These units were measured quantitatively. The results show that the content of SiCH 2 Si in condensates increases with the reaction is going on, but the content of Si-H bonds stays constant. The variation of the amounts provides a very useful guide on the synthetic reaction.