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首页> 外文期刊>European Polymer Journal >Tailoring the crystallization behavior of poly(L-lactide) with self-assembly-type oxalamide compounds as nucleators: 1. Effect of terminal configuration of the nucleators
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Tailoring the crystallization behavior of poly(L-lactide) with self-assembly-type oxalamide compounds as nucleators: 1. Effect of terminal configuration of the nucleators

机译：以自组装型草酰胺类化合物为成核剂调节聚L-丙交酯的结晶行为：1.成核剂末端构型的影响

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摘要

The bio-based and biocompostable semi-crystalline poly(L-lactide), PLLA, suffers from slow crystallization rate. Oxalamide compounds are tailor-made as novel self-assembly-type nucleators in this work, which altered significantly the crystallization kinetics of the PLLA. The terminal structures (cyclohexyl, benzyl and phenyl) show strong influence on their self-organization and nucleation efficiency. Their self-organizing temperature sequence (measured via rheology) in the PLLA melt is cyclohexyl > benzyl > phenyl 190 degrees C, while the nucleation activity follows a reverse order. Consequently, the compounds capped with phenyl group exhibit the highest nucleation efficiency. The oxalamide compounds in the PLLA melt showed varied depression in crystallization and dissolution temperatures, demonstrating a designable miscibility. Interestingly, the dissolved oxalamide compounds could organize into "shish-like" superstructures that subsequently triggered "shish-kebab" morphology of PLLA crystals free of any flow or shear. With the aid of phenyl-capped oxalamide compound (e.g. 0.75 wt.%), the crystallization of PLLA occurred at 108 degrees C with a crystallinity of 35% even upon fast cooling (20 degrees C/min), while the half-life crystallization time (t(0.5)) was dramatically reduced by 95% in a wide temperate range. In addition, the oxalamide compounds could significantly reduce the PLLA crystal size without modification on crystal form. (C) 2015 Elsevier Ltd. All rights reserved.
机译：生物基和生物可堆肥的半结晶聚（L-丙交酯）PLLA的结晶速度慢。草酰胺化合物是在这项工作中量身定制的新型自组装成核剂，可显着改变PLLA的结晶动力学。末端结构（环己基，苄基和苯基）对其自组织和成核效率显示强烈影响。它们在PLLA熔体中的自组织温度序列（通过流变学测定）为环己基>苄基>苯基190℃，而成核活性遵循相反的顺序。因此，被苯基封端的化合物显示出最高的成核效率。 PLLA熔体中的草酰胺化合物在结晶和溶解温度方面显示出不同的降低，表明可设计的混溶性。有趣的是，溶解的草酰胺化合物可以组织成“类似烤肉”的超结构，随后触发没有任何流动或剪切的PLLA晶体的“烤肉”形态。借助于苯基封端的草酰胺化合物（例如0.75wt。％），即使在快速冷却（20℃/ min）下，PLLA的结晶也在108℃下以35％的结晶度发生，而半衰期结晶在较宽的温度范围内，时间（t（0.5））大大降低了95％。另外，草酰胺化合物可以显着减小PLLA晶体的尺寸，而无需改变晶体形式。 （C）2015 Elsevier Ltd.保留所有权利。

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