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Self-assembling process of Oxalamide compounds and their nucleation efficiency in bio-degradable Poly(hydroxyalkanoate)s

机译:草酰胺类化合物的自组装过程及其在可生物降解的聚(羟基链烷酸酯)中的成核效率

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摘要

One of the key requirements in semi-crystalline polyesters, synthetic or bio-based, is the control on crystallization rate and crystallinity. One of the limiting factors in the commercialization of the bio-based polyesters, for example polyhydroxyalkanoates synthesized by bacteria for energy storage purposes, is the slow crystallization rate. In this study, we show that by tailoring the molecular structure of oxalamide compounds, it is possible to dissolve these compounds in molten poly(hydroxybutyrate) (PHB), having a hydroxyvalerate co-monomer content of less than 2 mol%. Upon cooling the polymer melt, the homogeneously dispersed oxalamide compound crystallizes just below the melting temperature of the polymer. The phase-separated compound reduces the nucleation barrier of the polymer, thus enhancing the crystallization rate, nucleation density and crystallinity. The findings reported in this study provide a generic route for the molecular design of oxalamide-based compounds that can be used for enhancing nucleation efficiency of semi-crystalline bio-based polyesters.
机译:合成或生物基半结晶聚酯的关键要求之一是控制结晶速率和结晶度。生物基聚酯的商业化的限制因素之一是缓慢的结晶速率,例如由细菌出于能量存储目的合成的聚羟基链烷酸酯。在这项研究中,我们表明通过调整草酰胺化合物的分子结构,可以将这些化合物溶解在羟基戊酸酯共聚单体含量小于2摩尔%的熔融聚羟基丁酸酯(PHB)中。在冷却聚合物熔体时,均匀分散的草酰胺化合物仅在低于聚合物的熔融温度下结晶。相分离的化合物降低了聚合物的成核屏障,从而提高了结晶速率,成核密度和结晶度。本研究报告的发现为草酰胺基化合物的分子设计提供了一条通用途径,可用于增强半结晶生物基聚酯的成核效率。

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