2021 Volume 42 Issue 4 Pages 139-150
Organic－inorganic hybrid materials were prepared using a thiol－ene reaction between random-type silsesquioxanes containing a mercapto group and N-allylmaleimide copolymers. First, various copolymers of N-allylmaleimide with different sequence structures and allyl contents were synthesized by ternary radical copolymerization of N-allylmaleimide combined with N-(2-ethylhexyl)maleimide and diisobutene, and binary copolymerization with 2-ethylhexyl acrylate in chloroform at 60℃. Next, the copolymers were thermally cured using thiol-modified silsesquioxanes as the cross-linking agent in the presence of triallyl isocyanurate, and the reactions of the allyl and mercapto groups were monitored by IR spectroscopy. All of the obtained organic－inorganic hybrid polymer materials showed excellent heat resistance and transparency. The effects of the ratio of allyl groups to mercapto groups in feed composition of the thermosetting systems and the content of the allyl groups in the copolymers on the thermal and mechanical properties of the cured products were investigated.
