Silicon-containing benzoxazines and their polymers: Copolymerization and copolymer properties

A silicon-containing benzoxazine BATMS-Bz (1,3-bis(3-aminopropyl)tetra-methyldisiloxane-benzoxazine) was used for polybenzoxazine modification by means of formation of benzoxazine copolymers with 3,4-dihydro-3-phenyl-2H-1,3-benzoxazine (Ph-Bz) and 3-furfuryl-3,4-dihydro-2H-1,3-benzoxazine (F-Bz), respectively. Ph-Bz/BATMS-Bz copolymers showed a positive deviation due the presence of intermolecular hydrogen bonding. However, this effect was not observed with F-Bz/BATMS-Bz copolymers. Meanwhile, BATMS-Bz incorporation exhibited significant effect on toughening polybenzoxazines. It is therefore demonstrated that BATMS-Bz is a high performance modifier to simultaneously enhance the T(g) and toughness of polybenzoxazines. (c) 2006 Wiley Periodicals, Inc.