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Enhanced crystallization kinetics of bacterially synthesized poly(3-hydroxybutyrate-co-3-hydroxyhexanate) with structural optimization of oxalamide compounds as nucleators
Polymer Degradation and Stability ( IF 6.3 ) Pub Date : 2018-06-02 , DOI: 10.1016/j.polymdegradstab.2018.06.001
Pengwu Xu , Ying Cao , Pei Lv , Piming Ma , Weifu Dong , Huiyu Bai , Wei Wang , Mingliang Du , Mingqing Chen

Bacterially synthesized poly (3-hydroxybutyrate-co-3-hydroxyhexanate) (PHBH) has attracted much attention as biodegradable plastics and potential biomaterials. However, the crystallization rate of PHBH is very low, which limits its application in plastic field. Herein, oxalamide compounds (OXAn) with a formula of C6H5NHCOCONH(CH2)nNHCOCONHC6H5 (n = 2, 4, 8, 12) were tailor-made as nucleators to improve the crystallization behaviors of PHBH. The effect of aliphatic spacer length of OXAn, i.e., -(CH2)n-on the nucleation behavior was investigated. The OXAn would assemble into shish-like superstructures and PHBH crystals preferred to grow on the surfaces of the shish. The crystallization rate of PHBH/OXAn blends increased with the spacer length of OXAn up to n = 8 and then leveled off, which trend was consistent with the nucleation activity (Ψ) and the nucleation constant (Kg) of the OXAn. Meanwhile, the OXAn increased the nuclei density of the PHBH while inhibited its secondary crystallization, resulting in a superior and steady mechanical performance of PHBH materials. This work provides a scientific approach to design the optimal structure of OXAn as nucleators for PHBH materials, which may broaden the application range of PHBH materials.



中文翻译:

细菌合成的聚(3-羟基丁酸酯的增强结晶动力学-3- hydroxyhexanate)与作为成核草酰胺化合物的结构优化

细菌合成的聚(3-羟基丁酸酯-3- hydroxyhexanate)(PHBH)已经引起了注意,因为生物降解性塑料和潜在的生物材料。然而,PHBH的结晶速率非常低,这限制了其在塑料领域的应用。在本文中,将具有化学式C 6 H 5 NHCOCONH(CH 2n NHCOCONHC 6 H 5(n = 2、4、8、12 )的草酰胺化合物(OXA n)定制为成核剂,以改善PHBH的结晶行为。研究了OXA n的脂肪族间隔基长度,即-(CH 2n-对成核行为的影响。OXAn会组装成类似烤肉串的上层建筑,PHBH晶体更适合在烤肉串的表面上生长。PHBH / OXA的结晶速率Ñ共混物与OXA的间隔长度的增加Ñ多达n = 8,然后趋于平稳,这趋势是与核活性(Ψ)和成核常数(K一致的OXA的)ñ。同时,OXA n增加了PHBH的核密度,同时抑制了其二次结晶,从而使PHBH材料具有优异而稳定的机械性能。这项工作提供了一种科学的方法来设计OXA n的最佳结构 作为PHBH材料的成核剂,可以扩大PHBH材料的应用范围。

更新日期:2018-06-02
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