New polysiloxanes bearing heterocyclic groups - synthesis and curability

The synthesis of new polysiloxanes bearing thioether and heterocyclic funct ions (epoxy or oxetane) was performed. The reaction is a radical addition b etween a poly(dimethyl - co-methyl mercaptopropyl) siloxane and allyl or vi nyl heterocyclic compounds. The corresponding sulfones were obtained by oxi dation of thioether functions by using,,m-chloroperbenzoic acid. All the pr oducts were characterized by H-1 NMR, SEC and viscosimetry. The cross-linki ng of these products with isophorone diamine was studied at different tempe ratures. Thermal and mechanical properties were examined by dynamical mecha nical and thermogravimetric analysis. (C) 1998 Elsevier Science Ltd. All ri ghts reserved.