部分生物基可生物降解聚（对苯二甲酸乙二醇酯-co-ε-己内酯）共聚酯的合成、微观结构和力学性能。
Synthesis, microstructure and mechanical properties of partially biobased biodegradable poly(ethylene brassylate-co-ε-caprolactone) copolyesters.
机构信息
State Key Laboratory of Fine Chemicals, Department of Polymer Science and Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
State Key Laboratory of Fine Chemicals, Department of Polymer Science and Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
出版信息
J Mech Behav Biomed Mater. 2019 Mar;91:255-265. doi: 10.1016/j.jmbbm.2018.12.019. Epub 2018 Dec 18.
High-molecular-weight poly(ethylene brassylate-co-ε-caprolactone) copolyesters within a wide composition range were prepared via triphenyl bismuth catalyzed copolymerization of ethylene brassylate (EB) and ε-caprolactone (ε-CL) in bulk. Microstructural analysis of the resulting copolyesters demonstrated that the comonomer units were completely random distribution. DSC and WAXD recognized that the copolyesters cocrystallize within the lattices analogous to either of the parent homopolymers. It confirmed the isodimorphism behavior with a pseudo-eutectic point of melting temperatures as well as lattice spacings at 75 mol% ε-CL units. The crystal cell would be stretched in one dimension rather than expanding in both dimensions with the incorporation of comonomer units according to the result of WAXD. The mechanical properties of the copolyesters are well tunable by the composition, and its trend is consistent with the isodimorphism behavior, in particular, the maximum elongation at break over 2000% is located at the pseudo-eutectic point. The intralamellar shear occurred at the low tensile rate while both intralamellar shear and interlamellar shear occurred at high tensile rate. The copolymers exhibit excellent hydrolytic stability.
通过三苯基铋催化的乙烯溴乙酸酯（EB）和己内酯（ε-CL）在本体中的共聚反应，制备了组成范围很宽的高分子量聚（乙烯溴乙酸酯-co-ε-己内酯）共聚酯。对所得共聚酯的微观结构分析表明，单体单元完全无规分布。DSC 和 WAXD 证实共聚酯在类似于任一母体均聚物的晶格内共晶。它在熔点的假共晶点以及 75mol%ε-CL 单元的晶格间距处证实了等二态行为。根据 WAXD 的结果，晶胞在一个方向上被拉伸，而不是在两个方向上扩展，从而掺入单体单元。根据 WAXD 的结果，共聚酯的力学性能可以通过组成很好地调节，其趋势与等二态行为一致，特别是在假共晶点处断裂伸长率超过 2000%。在低拉伸速率下发生层间剪切，而在高拉伸速率下发生层间剪切和层间剪切。共聚物表现出优异的水解稳定性。
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