Synthesis and characterization of hyperbranched polycarbosilazane

Guobin Zhang, Xiaodong Fan, Jie Kong, Shengjie Wang, Yuyang Liu, Qingfa Si

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

In order to enhance the reactivity of the silyl-containing ceramic precursor, a hyperbranched silyl-containing polymer with low viscosity and plenty of terminal vinyl-groups was prepared. A novel AB4 type monomer, bis(N, N-diallylamino)methylsilane, was synthesized first by aminolysis of MeHSiCl2 and then was polymerized via hydrosilylation reaction using H2PtCl6 as the catalyst. The polymerization process was monitored by FT-IR spectroscopy. The polymer product was purified via precipitation using ethyl ether and acetonitrile and was analysed by using 1H-NMR, 29Si-NMR and FT-IR spectroscopy. The results indicated that the polymer was hyperbranched polycarbosilazane, and α-hydrosilylation was the main reaction. The degree of branching (DB) of the hyperbranched polymer was 0.56 calculated from the Si-NMR spectrum, and the average molecular weight (Mw) was 13 580 g/mol determined by light scattering method. It was found that there still existed a lot of functional vinyl end groups, which can be used as promising reaction centers for curing or modification of the polycarbosilazane.

Original languageEnglish
Pages (from-to)173-176
Number of pages4
JournalActa Polymerica Sinica
Issue number1
DOIs
StatePublished - Feb 2006

Keywords

  • Hydrosilylation reaction
  • Hyperbranched polycarbosilazane

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