环境友好高分子材料聚己二酸丁二酯(PBA)的应用化制备及其多晶结构-球晶形貌-生物降解性的关系及调控机理

项目名称： 环境友好高分子材料聚己二酸丁二酯(PBA)的应用化制备及其多晶结构-球晶形貌-生物降解性的关系及调控机理

项目编号： No.21304070

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 杨进军

作者单位： 天津理工大学

项目金额： 24万元

中文摘要： 聚己二酸丁二酯(PBA)在环境友好材料方面有较大的应用前景。由低至高温，PBA依次生成β、α+β、α晶体。α和β晶体化学结构一样，但两者在尺寸、结晶速率、熔点、热稳定性、生物降解性方面有差异。 PBA多晶的球晶形貌（环带和无环带球晶）与分子量、温度等因素密切相关。α晶体尺寸及结晶度比β晶体大，但其生物降解速率却比β的要快。更有趣的是：呈现环带球晶的α+β混合晶体的生物降解速率比α、β晶体都要慢。上述两个有趣的现象至今还没有合理的解释。对PBA球晶形貌-多晶结构-生物降解性三者关系的阐明有助我们加深和拓宽对高分子材料的微观形态、结构和性能的认识。另外，PBA的机械性能差，难以在实际生产生活中应用。 本项目拟在以下3方面展开研究：（1）PBA复杂的球晶相貌与分子量、温度等的对应关系；（2）PBA多晶结构、球晶形貌和生物降解性的内在联系及调控；（3）高分子量PBA及其复合材料的制备及性能调控。

中文关键词： 聚己二酸丁二酯（PBA）；聚集态结构；晶体形貌；生物降解性；

英文摘要： Poly(butylene adipate) can be potentially applied in environmentally friendly material. PBA β, α+β and α crystal will be formed depending on melt-crystallization temperature. Although shares the same chemical structure, α crystal differs from β-counterpart in crystal size, melt-crystallization temperature, crystallization rate, melting point, thermal stability and biodegradability. β crystal shows lower crystallization temperature than α. After annealing at higher temperature or heating at lower rate, β crystal would transform into α-counterpart, that is to say, phase transition occurs. Therefore, α crystal is thermodynamically stable phase and β one is metastable phase. Spherulite morphologies (ring-band and ringless) of PBA polymorphic crystals change depending on molecular weight, crystallization temperature, and so on. α crystal possesses a larger crystal size and crystallinity than β-counterpart, but it shows a greater biodegradability. It is interesting that, α+β mixed crystal presents the slowest biodegradability. Until now, there is no reasonable explannation for the above two interesting phenomena. PBA has not be utilized in practical uses because of its weak mechanical properties. Elucidation of relationships of spherulite morphology, polymorphic crystalline structure and biodegradability of PBA is

英文关键词： poly(butylene adipate)；aggregation structure；crystal morphology；biodegradation；