Asymmetrical formation of isomorphism in the crystalline/crystalline blend of poly(butylene succinate) and poly(butylene fumarate)

结晶 材料科学 差示扫描量热法 聚丁二酸丁二醇酯 衍射仪 傅里叶变换红外光谱 化学工程 结晶学 晶体结构 聚合物 聚酯纤维 Crystal(编程语言) 高分子化学 复合材料 扫描电子显微镜 热力学 化学 程序设计语言 工程类 物理 计算机科学
作者
Xue-Wei Wei,Lulu Yang,Yi Li,Xiaoyu Meng,Li-Hai Cai,Qiong Zhou,Hai‐Mu Ye
出处
期刊:Polymer [Elsevier BV]
卷期号:235: 124282-124282 被引量:9
标识
DOI:10.1016/j.polymer.2021.124282
摘要

Blending is a convenient method to regulate the crystallization behavior and thus the performance of polymer materials, but poor compatibility in crystalline phase for different components remarkably depresses the co-crystallization capability, which poses a great challenge to effective regulation of the properties for crystalline/crystalline blends. In this work, the co-crystallization between two kinds of polyester with similar chain structure, poly(butylene succinate) (PBS) and poly(butylene fumarate) (PBF) is investigated and found to be dependent on the blending ratio and crystallization condition. A new type of co-crystal is only discovered in the PBS-rich blends (i.e., PBS/PBF-6/4 and PBS/PBF-8/2), and, further, it is proved as the isomorphism between PBS and PBF by employing various characterizations of differential scanning calorimeter and Fourier transformation infrared spectrometer and X-ray diffractometer. Both the enhancing cooling rate and the increasing PBS content benefit the growth of isomorphic co-crystal, and, its fraction in the blend of PBS/PBF-8/2 can reach as high as ∼75% during a fast cooling rate of 40 °C/min. In addition, the changes of Gibbs free energy for including butylene fumarate unit into PBS-type crystal and including butylene succinate unit into PBF-type crystal are respectively calculated as −0.96 and 1.94 kJ/mol, revealing the intrinsic thermodynamic driving force for the forming of isomorphism and clarifying why isomorphism only occurs in the PBS-rich blends. Finally, a summary of the crystallization behavior of PBS/PBF blend is reasonably sketched, which will help design the crystalline/crystalline blends with desired structure and performance.
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