Phase Compatibilization through Chemical Exchange Reactions in Blends of Copolyesters with Poly(hydroxyether of bisphenol A) upon Annealing

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• 作者：Chean-Cheng Su ; Shiang-Ching Wang ; Wan-Jing Chen ; Li-Ting Lee
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：September 4, 2013
• 年：2013
• 卷：52
• 期：35
• 页码：12587-12595
• 全文大小：488K
• 年卷期：v.52,no.35(September 4, 2013)
• ISSN：1520-5045

文摘

Miscibility or compatibilization via transreactions in blends of one of two copolyesters, poly(butylene adipate-co-butylene terephthalate) [P(BA-co-BT)] or poly(butylene succinate-co-butylene terephthalate) [P(BS-co-BT)], with poly(hydroxy ether of bisphenol A) (phenoxy) were investigated. The P(BA-co-BT)/phenoxy blend exhibited a homogeneous phase and a composition-dependent glass transition temperature (T_g) without any heat annealing. The copolymer鈥損olymer interaction parameter (蠂₁₂) for the P(BA-co-BT)/phenoxy blend was calculated from the melting-point-depression method to be 鈭?.12. However, variation in the composition and structure of the copolyesters easily causes phase separation in copolyester/phenoxy blends. The P(BS-co-BT)/phenoxy blend had a phase morphology that could be homogenized only following annealing at high temperatures. As-blended P(BS-co-BT)/phenoxy (50/50 composition) exhibited immiscible phases with two distinct T_gs, but the initially phase-separated blends finally merged to form a homogeneous phase with a single T_g upon heating and annealing for 60 min at 280 掳C. Chemical exchange reactions upon heat annealing of the P(BS-co-BT)/phenoxy blend caused phase homogenization.