Crystallization behavior and biodegradation of poly(3-hydroxybutyrate) and poly(ethylene glycol) multiblock copolymers
Crystallization behavior and biodegradation of poly(3-hydroxybutyrate) and poly(ethylene glycol) multiblock copolymers
复制标题
聚（3-羟基丁酸酯）和聚（乙二醇）多嵌段共聚物的结晶行为和生物降解
DOI：
10.1016/j.polymdegradstab.2005.09.003
复制
发表时间：
2006
影响因子：
5.9
通讯作者：
Liguang Zhang
中科院分区：
文献类型：
--
作者：
Qiang Zhao;G. Cheng;Cunjiang Song;Yi Zeng;Jian Tao;Liguang Zhang
异氰酸酯嵌段共聚是一种将PHB与聚乙二醇酯进行嵌段共聚的有效方法，因为它能制备出韧性、强度等优良性能的共聚物。在这项研究中，我们采用土壤悬浮系统来评价一系列不同组成和嵌段长度的PHB/PEG多嵌段共聚物的生物降解性。在降解过程中，定期测量其失重、相对分子质量和拉伸强度的变化，以确定其可生物降解性，并用扫描电子显微镜观察其表面形貌。与纯PHB相比，共聚物的失重率相对较低。BHG1000-3-1的拉伸强度和相对分子质量明显下降，分别为初始值的46.7%和77.7%。扫描电子显微镜观察表明，表面覆盖有大量的腐蚀坑。所有这些都表明降解确实发生了，长链分子被水解成了较短的分子。用DSC和WAXD研究了其结晶行为。结果表明，在PHB含量较低(29%~44%)时，聚乙二醇和PHB两种链段都能形成结晶相，当PHB含量大于60%时，只有PHB相可以结晶。
Block copolymerization by using isocyanates is an effective method for incorporating PHB and PEG because it can prepare copolymers with good properties, such as toughness, strength, and so on. In this study, we adopted soil suspension system to estimate the biodegradability of a series of PHB/PEG multiblock copolymers with different compositions and block lengths. In the degradation process, the changes in weight loss, molecular weight, and tensile strength were periodically measured to determine the biodegradability, and the surface morphology was also observed by SEM. In contrast to pure PHB, the weight loss of the copolymer was relatively lower. On the other hand, the tensile strength and molecular weight experienced apparent decrease, and for BHG1000-3-1, they reached 46.7% and 77.7% of the initial value, respectively. SEM observation showed that the surface was covered with numerous erosion pits. All these indicate that the degradation indeed took place and long-chain molecules have been hydrolyzed into shorter ones. The crystallization behavior was also investigated by DSC and WAXD. The results showed that both the segments, PEG and PHB, can form crystalline phases at lower PHB contents ranging from 29% to 44%, and when PHB component was more than 60%, only PHB phase can crystallize.
Y.WANG：“通过来自 Acidovorax sp. TP4 和 Ralstonia pickettii T1 的聚（3-羟基链烷酸酯）解聚酶对化学合成的无规聚（3-羟基丁酸酯）进行酶水解”生物大分子。
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
--