Yang Cheng-Fu, Wang Hsiang-Ching, Su Chean-Cheng
Department of Chemical and Materials Engineering, National University of Kaohsiung, No. 700, Kaohsiung University Rd., Nan-Tzu Dist., Kaohsiung 811, Taiwan.
Materials (Basel). 2017 Jun 23;10(7):692. doi: 10.3390/ma10070692.
This work concerns the enhancement in the compatibility of blends of poly (1,4-butylene adipate) (PBA) with poly (hydroxy ether of bisphenol-A) (phenoxy) via alcoholytic exchange. Results on the thermal behavior and morphology show that the blended PBA/phenoxy system exhibits a homogeneous phase and a composition-dependent glass transition temperature (T). The interaction parameter () of PBA/phenoxy blends was calculated using the melting point depression method and was found to be -0.336. However, the compatibilization of PBA/phenoxy blends can be enhanced by chemical exchange reactions between PBA and phenoxy upon annealing. Annealed PBA/phenoxy blends were found to have a homogeneous phase with a higher T than that of the blended samples, and a smooth surface topography that could be improved by annealing at high temperature. The results of this investigation demonstrate that promotional phase compatibilization in the PBA/phenoxy blend can only be obtained upon thermal annealing, thus causing transreactions to occur between the dangling -OH of the phenoxy and the ester functional groups in PBA. Extensive transreactions cause alcoholytic exchange between the PBA and phenoxy to form a network, thus reducing the mobility of the polymer chain. Finally, the crystallinity of PBA decreased as the degree of transreaction in the blends increased.
本研究工作涉及通过醇解交换提高聚己二酸丁二醇酯（PBA）与双酚A聚醚（苯氧基树脂）共混物的相容性。热行为和形态学结果表明，共混的PBA/苯氧基树脂体系呈现均相，且玻璃化转变温度（T）与组成有关。采用熔点降低法计算了PBA/苯氧基树脂共混物的相互作用参数（），其值为-0.336。然而，退火后PBA与苯氧基树脂之间的化学交换反应可增强PBA/苯氧基树脂共混物的相容性。发现退火后的PBA/苯氧基树脂共混物为均相，其T高于共混样品，且表面形貌光滑，高温退火可改善表面形貌。本研究结果表明，PBA/苯氧基树脂共混物中促进相相容性只能通过热退火获得，从而使苯氧基树脂的悬垂-OH与PBA中的酯官能团之间发生转反应。大量的转反应导致PBA与苯氧基树脂之间发生醇解交换形成网络，从而降低了聚合物链的流动性。最后，随着共混物中转反应程度的增加，PBA的结晶度降低。
