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Chain extenders for polyesters. VI. Properties of the polyesters chain‐extended by 2,2′‐bis(4H‐3,1‐benzoxazin‐4‐one)
Author(s) -
Inata Hiroo,
Matsumura Shunichi
Publication year - 1987
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1987.070340812
Subject(s) - polyester , hydrolysis , branching (polymer chemistry) , polymer chemistry , polymer , ethylene , chain (unit) , thermal stability , materials science , melting point , condensation polymer , chemistry , organic chemistry , physics , astronomy , catalysis
Some properties of polymers derived by treating poly(ethylene terephthalate) (PET) with such hydroxyl‐addition‐type chain extenders as 2,2′‐bis(4H‐3,1‐benzoxazin‐4‐one) (BNZ) were investigated. Compared with ordinary PET, the chain‐extended PET has a slightly lower melting point and nearly equal molecular size distribution, which indicate that BNZ reacts to form linear chain‐extended polymers without branching. Oxalyl bis(anthranilate) unit copolymerized in the polyester chain showed little influence on thermal and hydrolytic stabilities. In addition, benzoxazinone groups remaining unreacted can act as a heat stabilizer to prevent the decrease in the molecular weight by the chain‐extending reaction in the solid phase. But they showed adverse effect on the hydrolytic stability by promoting hydrolysis of the polymer as much as the carboxyl groups.