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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 ∼ 190°C 4 for 24 hrs 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°C. In the present work, properties of multi-block copolymers have been investigated.