Crystallization Kinetics, Morphology, and Mechanical Properties of Novel Biodegradable Poly(ethylene succinate-co-ethylene suberate) Copolyesters
Crystallization Kinetics, Morphology, and Mechanical Properties of Novel Biodegradable Poly(ethylene succinate-co-ethylene suberate) Copolyesters
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DOI：
10.1021/acs.iecr.6b02654
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发表时间：
2016-10-05
影响因子：
4.2
通讯作者：
Qiu, Zhaobin
中科院分区：
文献类型：
--
作者：
Qiu, Shoutian;Su, Zhiqiang;Qiu, Zhaobin
本研究通过两步熔融缩聚方法，成功合成了三种辛二酸乙烯酯（ESub）含量在4.8至15.3 mol%之间且分子量相近的聚（丁二酸乙烯酯-共-辛二酸乙烯酯）（PESSub）共聚物。为了证明 ESub 成分的影响，系统地研究了 PESSSub 的结晶动力学、形态和机械性能。 PESSSub的晶体结构与PES相同；然而，随着ESub组成的增加，结晶度值略有下降。 ESub含量的增加导致PESSSub的玻璃化转变温度、冷结晶温度、冷结晶焓、熔点、熔化热和平衡熔点降低。增加 ESub 成分保留了结晶机制，但降低了结晶速率和球晶生长速率。具有较高 ESub 组分的共聚物表现出较大的断裂伸长率，但拉伸强度和杨氏模量较小。通过调节ESub单元的含量可以很好地调节合成的新型共聚酯的结晶行为和机械性能。
Through a two-step melt polycondensation method, three poly(ethylene succinate-co-ethylene suberate) (PESSub) copolymers containing different contents of ethylene suberate (ESub) from 4.8 to 15.3 mol % and with similar molecular weights were successfully synthesized in this research. To demonstrate the effect of the ESub composition, the crystallization kinetics, morphology, and mechanical properties of PESSub were systematically studied. The crystal structure of PESSub was the same as that of PES; however, with increasing ESub composition, the degree of crystallinity values slightly decreased. The increase of the ESub content led to a depression in the glass transition temperature, cold crystallization temperature, cold crystallization enthalpy, melting point, heat of fusion, and equilibrium melting point of PESSub. Increasing the ESub composition retained the crystallization mechanism but decreased the crystallization rates and spherulitic growth rates. The copolymers with higher ESub component showed greater elongation at break but smaller tensile strength and Young's modulus. The crystallization behavior and mechanical properties of the synthesized novel copolyesters were well-regulated by adjusting the content of the ESub units.