Enhanced crystallization and storage stability of mechanical properties of biosynthesized poly (3-hydroxybutyrate-co-3-hydroxyhexanate) induced by self-nucleation.
Enhanced crystallization and storage stability of mechanical properties of biosynthesized poly (3-hydroxybutyrate-co-3-hydroxyhexanate) induced by self-nucleation.
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DOI：
10.1016/j.ijbiomac.2021.06.120
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发表时间：
2021-06
影响因子：
8.2
通讯作者：
Pengwu Xu;Qian Wang;Manman Yu;Weijun Yang;Yunxuan Weng;W. Dong;Mingqing Chen;Yang Wang;P. Ma
中科院分区：
文献类型：
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作者：
Pengwu Xu;Qian Wang;Manman Yu;Weijun Yang;Yunxuan Weng;W. Dong;Mingqing Chen;Yang Wang;P. Ma
生物合成的聚（3-羟基丁酸酯-co-3-羟基己酸酯）（PHBH）由于结晶性能不佳而导致力学性能差，限制了其广泛应用。本工作首次采用高熔点聚3-羟基丁酸酯（PHB）作为均质成核剂，采用自成核法提高PHBH的结晶速率，并对PHBH/PHB共混物的结晶动力学和力学性能的储存稳定性进行了系统研究。通过控制加工温度和PHB含量，可大大提高PHBH的晶核密度和结晶速率，抑制二次结晶。当加工温度为185 °C，PHB含量为20wt%时，半结晶时间缩短了96%，结晶度提高到37.2%。同时，PHBH的力学性能和贮存稳定性也得到了很大的提高。因此，本工作提供了一种简单有效的方法来改善PHBH的结晶和力学性能，有望大规模应用于工业生产。
The poor mechanical properties induced by unsatisfactory crystallization ability limit the widespread use of biosynthesized poly (3-hydroxybutyrate-co-3-hydroxyhexanate) (PHBH). In this work, poly (3-hydroxybutyrate) (PHB) with a high melting point was first used as a homogeneous nucleating agent to increase the crystallization rate of PHBH by a self-nucleation method with a wider processing temperature window and crystallization kinetics and storage stability of mechanical properties of the PHBH/PHB mixtures were systematically investigated. By controlling the processing temperature and PHB content, the crystal nucleus density and crystallization rate of PHBH could be greatly increased while secondary crystallization was inhibited. When the processing temperature is 185 °C and PHB content is 20 wt%, the half crystallization time is shortened by 96% and the crystallinity was increased to 37.2%. Meanwhile, the mechanical performance of PHBH and its storage stability are greatly improved. Therefore, this work provides a simple and efficient way to improve the crystallization and mechanical performance of PHBH, which is expected to be applied to industrial production on a large scale.