Control of structure formation of polycarbosilane synthesized from polydimethylsilane by kumada rearrangement

Jiangxi Chen, Guomei He, Zhinan Liao, Birong Zeng, Jianglei Ye, Lifu Chen, Haiping Xia, Litong Zhang

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The control of structure formation of polycarbosilane (PCS) synthesized from polydimethylsilane (PDMS) was studied. It was found that the molecular structure of PCS was strongly dependent on the reaction time and reaction temperature. Shorter reaction time or lower reaction temperature is preferred to produce higher concentration of HSiC3 group and less SiC4 group in PCS skeleton, which was confirmed by 29Si NMR analysis. Higher reaction temperature or longer reaction time tended to dissociate more Si-Si chains to give PCS with higher molecular weight and broader distribution, as veritied by GPC characterization. By interrupting the structure evolution of PCS from PDMS at low reaction temperature with short reaction time, solid PCS with controllable molecular structure can be obtained after the removal of the low molecular fraction by precipitation with ethanol. A scissor-couple rearrangement model was proposed for the formation of the PCS skeleton.

Original languageEnglish
Pages (from-to)3114-3121
Number of pages8
JournalJournal of Applied Polymer Science
Volume108
Issue number5
DOIs
StatePublished - 5 Jun 2008
Externally publishedYes

Keywords

  • Heteroatom-containing polymers
  • Polysilanes
  • Structure
  • Synthesis

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