Investigating the crystallization, melting behavior, and thermal stability of poly(l-lactic acid) using aromatic isoniazid derivative as nucleating agent
Investigating the crystallization, melting behavior, and thermal stability of poly(l-lactic acid) using aromatic isoniazid derivative as nucleating agent
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DOI：
10.1007/s00289-017-1923-4
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发表时间：
2017-01
期刊：
影响因子：
3.2
通讯作者：
Yan-Hua Cai;Lisha Zhao;L. Tian
中科院分区：
文献类型：
--
作者：
Yan-Hua Cai;Lisha Zhao;L. Tian
结晶性能差是半结晶聚合物面临的共同挑战。在这项工作中，合成了一种由异烟肼和1,4-二羧基苯衍生的芳香族异烟肼衍生物（DI）作为聚（L-乳酸）（PLLA）的成核剂，并通过一系列测量研究了PLLA/DI的结晶行为、熔融行为和热稳定性。非等温结晶行为表明，DI的掺入显着促进了PLLA在1℃/min冷却下的结晶；然而，成核效率也明显受到冷却速率的影响。 DI 浓度对 PLLA 非等温结晶的影响表明，3 wt% DI 表现出最好的结晶加速效果，并且 PLLA/3% DI 在冷却过程中的非等温结晶焓相对于主 PLLA 显着增强，高达 330 倍。 XRD 和相关熔融行为测量进一步证实了 DI 对 PLLA 的先进促进结晶作用。此外，测量还表明，DI的添加并不能改变PLLA的晶型，双熔融峰归因于熔融-重结晶机制。热稳定性表明PLLA的热分解行为不依赖于DI浓度；然而，随着DI浓度的增加，起始分解温度降低。
The poor crystallization performance is the common challenge for semicrystalline polymers. In this work, a aromatic isoniazid derivative (DI), derived from isoniazid and 1,4-dicarboxybenzene, was synthesized to serve as a nucleating agent for poly(l-lactic acid) (PLLA), and the crystallization behavior, melting behavior, and thermal stability of PLLA/DI were investigated through a series of measurements. The non-isothermal crystallization behavior showed that the incorporation of DI significantly promoted the crystallization of PLLA in cooling of 1 °C/min; however, the nucleating effectiveness was also evidently affected by the cooling rate. The effect of DI concentration on non-isothermal crystallization of PLLA indicated that 3 wt% DI exhibited the best crystallization acceleration effectiveness, and the non-isothermal crystallization enthalpy of PLLA/3% DI in cooling was considerably enhanced up to 330 times with respect to the primary PLLA. Both XRD and the relevant melting behavior measurements further confirmed the advanced promoting crystallization effect of DI for PLLA. In addition, the measurement also showed that the addition of DI could not change the crystalline form of PLLA, and the double melting peaks were attributed to the melting-recrystallization mechanism. Thermal stability indicated that the thermal decomposition behavior of PLLA did not depend on the DI concentration; however, the onset decomposition temperature decreased with the increase of DI concentration.