Chemical Exchange Reactions in Blends of Biodegradable Copolyester and Phenoxy

• Main Authors: Hsiang-Ching Wang, 王湘晴
• Other Authors: Chean-Chang Su
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/58716210029977322963

碩士 === 國立高雄大學 === 化學工程及材料工程學系碩士班 === 101 === Miscibility、Thermal behavior and Tranesterification of the Poly(butylene adipate-co-butylene terephthalate)/Phenoxy (P(BA-co-BT)/Phenoxy) blends were investigated by differential scanning calorimetry (DSC)、optical microscopy (OM)、Fourier transform infrared spectroscopy (FT-IR)、scanning electron microscopy (SEM) and atomic force microscopy, (AFM). In order to understand properties of P(BA-co-BT)/Phenoxy blends, miscibility, thermal behavior, and transesterification of the homopolymers blends, Phenoxy/poly(1,4-butylene adipate) (Phenoxy/PBA) and Phenoxy/poly(1,4-butylene terephthalate) (Phenoxy/PBT) blends were also investigated in the study. The result of phase morphology and thermal analysis revealed that the Phenoxy/P(BA-co-BT) and Phenoxy/PBA exhibited a homogeneous phase and a composition-dependent glass transition temperature (Tg), indicating the blends were miscible. In the Phenoxy/P(BA-co-BT) blends, the interaction parameter χ12 was -0.14, and the interaction parameter χ12 was -0.336 in the Phenoxy/PBA blends . The Phenoxy/PBT blends exhibited a heterogeneous phase and composition-independent glass transition temperature (Tg), indicating the blend was immiscible. Moreover, the result of thermal analysis revealed that a homogeneous phase and the glass transition temperature (Tg) increased in the Phenoxy/P(BA-co-BT) 、 Phenoxy/PBA and Phenoxy/PBT blends when it was heated at 260℃. Apparently, there was a chemical interaction in the Phenoxy/P(BA-co-BT)、Phenoxy/PBA and Phenoxy/PBT blends after heat treatment. Also, the result of AFM revealed chemical interaction in the Phenoxy/P(BA-co-BT) blends. The crystallization temperature of the blend subjected to cyclic heating/cooling treatment is influenced by the total annealing time. Some transesterification reactions might occur in the Phenoxy/P(BA-co-BT) blends. Furthermore, the result of FT-IR revealed chemical interaction in the Phenoxy/P(BA-co-BT)、Phenoxy/PBA and Phenoxy/PBT blends. In the study, a special dual transesterification was proved in the Phenoxy/P(BA-co-BT)、Phenoxy/PBA and Phenoxy/PBT blends. Finally, the mechanisms of transesterification in the Phenoxy/P(BA-co-BT)、Phenoxy/PBA and Phenoxy/PBT blends were suggested in the study.