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Synthesis, characterization, and UV curing kinetics of hyperbranched polycarbosilane
Author(s) -
Wang ShengJie,
Fan XiaoDong,
Kong Jie,
Liu YuYang
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.27534
Subject(s) - diluent , curing (chemistry) , hydrosilylation , polymer chemistry , materials science , kinetics , fourier transform infrared spectroscopy , polymer , differential scanning calorimetry , branching (polymer chemistry) , gel permeation chromatography , activation energy , chemical engineering , chemistry , composite material , nuclear chemistry , organic chemistry , catalysis , physics , thermodynamics , quantum mechanics , engineering
Hyperbranched polycarbosilane with allyl end groups was synthesized via hydrosilylation of methyldiallyldilane, and characterized by Fourier transform infrared spectroscopy, 1 H, 13 C, 29 Si nuclear magnetic resonance, and size exclusion chromatography/multiangle laser light scattering. The degree of branching and average number of branches of the resulted polymer determined by 29 Si NMR spectroscopy is 0.58 and 0.42, and the exponent α in Mark–Houwink equation is 0.33 based on the relationship between viscosity and molecular weight. UV curing behaviors of the hyperbranched polycarbosilane were investigated using differential scanning photocalorimeter, and the effects of diluent's concentration, light intensity, reaction atmosphere, and temperature on the curing behaviors and kinetics were studied in detail. It was found that curing reaction can be accomplished rapidly under UV irradiation within 40 s both in air and in nitrogen atmosphere if acrylic reactive diluent was employed. The result suggests that it is an effective way to increase the curing reactivity by incorporating acrylic reactive diluents with high UV sensitivity into the polycarbosilane system. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008