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dc.contributor.authorWei, KHen_US
dc.contributor.authorHo, JCen_US
dc.date.accessioned2014-12-08T15:01:55Z-
dc.date.available2014-12-08T15:01:55Z-
dc.date.issued1997-03-24en_US
dc.identifier.issn0024-9297en_US
dc.identifier.urihttp://hdl.handle.net/11536/660-
dc.description.abstractTransesterification mechanisms and rate in blends of polycarbonate (PC) and random liquid crystalline polyester copoly(oxybenzoate-p-terephthalate) at molar ratio 40/60 (P46) were studied through a five-component diad analysis and with C-13 and H-1-C-13 nuclear magnetic resonance spectroscopy. It was found that the ester-ester interchange in the two polymers took place within 15 min when the blend was annealed at 260 degrees C in vacuum. In the annealed blend, the Bisphenol A unit in polycarbonate reacted first with the terephthalate unit and then with the oxybenzoate unit in copoly(oxybenzoate-p-terephthalate). As the transesterification in the blend continued for about 1 h, the forming of dad Bisphenol A-oxybenzoate exceeded that of diad Bisphenol A-terephthalate. This large loss (57%) of the diad oxybenzoate-oxybenzoate caused the disappearance of the liquid crystalline phase in the blend. In sharp contrast to the originally immiscible blend of PC and P46 (two distinctive glass transition temperatures), the large loss of the liquid crystalline diad resulted in complete miscibility in the annealed blend, as evidenced by the appearance of a single glass transition temperature in the differential scanning calorimetry measurement.en_US
dc.language.isoen_USen_US
dc.titleThe role of transesterification on the miscibility in blends of polycarbonate and liquid crystalline copolyesteren_US
dc.typeArticleen_US
dc.identifier.journalMACROMOLECULESen_US
dc.citation.volume30en_US
dc.citation.issue6en_US
dc.citation.spage1587en_US
dc.citation.epage1593en_US
dc.contributor.department交大名義發表zh_TW
dc.contributor.department材料科學與工程學系zh_TW
dc.contributor.departmentNational Chiao Tung Universityen_US
dc.contributor.departmentDepartment of Materials Science and Engineeringen_US
dc.identifier.wosnumberWOS:A1997WP90900009-
dc.citation.woscount50-
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