화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.492, 172-183, 2008
Synthesis and Characterization of Poly(hydroxyamide-benzoxazole) Multi-Block Copolymers
Poly(hydroxyamide-benzoxazole) multi-block copolymers were prepared from the polymerization of 2,2'-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane (6FAP) and 4,4'-oxydibenzoyl chloride (ODBC). N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) or N,O-bis(trimethylsilyl)acetamide (BSA) was used as a silylation agent to activate amine functional groups. The amine terminated hydroxyamide prepolymers (ATHA) were synthesized by employing the low temperature solution polymerization via the in situ silylation method. p-Toluenesulfonic acid was added into the reaction mixture of ATHA, which in turn followed by cyclodehydration at 150 similar to 190 degrees C 4 for 24hrs to produce amine terminated benzoxazole oligomers (ATBO). Finally, the poly(hydroxyamide-benzoxazole) multi-block copolymers were prepared from the condensation of ATHA, ATBO and ODBC by employing the silylation method at relatively low temperature of 60 degrees C. In the present work, properties of multi-block copolymers have been investigated.