STUDY ON THE CHAIN-EXTENDING REACTION OF POLY (ETHYLENE TEREPHTHALATE) WITH 2,2′-BIS (4H-3, 1-BENZOXAZIN-4-ONE)

摘要

2,2′-Bis (4H-3, 1-benzoxazin-4-one) (BBON) has been proved to be an effective chain extender for poly (ethylene terephthalate) (PET). In order to study the reaction mechanism and kinetics of chain-extending reaction, β-bishydroxyethylene terephthalate (BHET) was selected as model compound. The NMR data, IR spectra and number average molecular weight (M_n) of the products obtained from the reaction of BBON and BHET verify that BBON is a hydroxyl-reactive extender. The mechanism was discussed. Kinetics data indicate that extending reaction is a second order reaction, and BBON has high reactivity. The activation energy (E_a) was measured.