Kazutoshi Yokomachi, M. Seino, Stephen J. Grunzinger
Mar 15, 2008
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0
Influential Citations
12
Citations
Journal
Polymer Journal
Abstract
Hyperbranched polysiloxysilane (HBPS) with terminal vinyl groups P1 was synthesized by self-condensation reaction using platinum-catalyzed hydrosilylation of 1,1,3,5,5-pentamethyl-1,5-divinyltrisiloxane. A number-average molecular weight (Mn) was 5400 with a polydispersity index of 1.49. End-functionalization of the terminal vinyl groups was carried out by epoxidation with 3-chloroperoxybenzoic acid to afford epoxy-terminated HBPS P2. The polymers obtained were characterized by IR, 1H, 13C, 29Si NMR spectroscopy. The degree of branching of HBPS was estimated as 0.57 in comparison of 29Si NMR spectra of P2 and model compounds. The glass transition temperatures (Tg) of P1 and P2 were observed at −97 °C and −77 °C, respectively. The 10% weight loss temperatures (T10) of P1 and P2 were over 440 °C in nitrogen.