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A study on blends of liquid crystalline copolyesters with polycarbonate. II. Transesterification control
Author(s) -
Wei KungHwa,
Su KoeFu
Publication year - 1996
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/(sici)1097-4628(19960131)59:5<787::aid-app5>3.0.co;2-s
Subject(s) - transesterification , differential scanning calorimetry , polycarbonate , materials science , nuclear chemistry , bisphenol a , poly ethylene , polymer chemistry , diphenyl carbonate , ethylene , catalysis , organic chemistry , chemistry , composite material , physics , thermodynamics , epoxy
The inhibited and catalyzed ester exchange (transesterification) during melt blending of poly(bisphenol‐A carbonate) (PC) and liquid crystalline poly(oxybenzoate‐ co ‐ethylene terephthalate) (POB–PET 40/60; P46) was investigated with differential scanning calorimetry. It was found that the ester exchange between P46 and PC was effectively inhibited for a 20% P46 blend at 240°C, as further confirmed by nuclear magnetic spectroscopy. When the blending temperature and P46 concentration increased, only the transesterification between the PET segment in P46 and PC took place under inhibition. The morphology of the blends was analyzed with scanning electron microscopy and displayed a disconnected interface between P46 and PC under inhibition. Conversely, the transesterification took place between the POB segment in P46 and PC when a catalyst was added. © 1996 John Wiley & Sons, Inc.