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首页> 外文期刊>Polymers for advanced technologies >Multiscale analysis on multiextruded poly(lactic acid)/organoclay nanocomposites: Insights into the underlying mechanisms of thermomechanical degradation
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Multiscale analysis on multiextruded poly(lactic acid)/organoclay nanocomposites: Insights into the underlying mechanisms of thermomechanical degradation

机译：多尺寸聚（乳酸）/有机粘土纳米复合材料的多尺度分析：热机械降解潜在机制的见解

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摘要

Due to the growing market and the relatively high price of poly(lactic acid) (PLA), the possibility to recycle PLA has attracted a tremendous attention, aiming to reduce the environmental impact related to the life cycle of PLA-based products. However, the comprehensive structural and properties changes of PLA and PLA/clay nanocomposites induced by reprocessing are still not clear. In this work, PLA and its organoclay nanocomposites (PCN5) were subjected to repeated extrusion for 1 and 4 cycles to reveal their recycling characteristics by the observation of the changes in the microstructure, thermal and mechanical properties. Gel permeation chromatography, rheology and morphology analyses were utilized to deeply explore effects of the cycle number on the evolution of chemical structures and clay dispersion. It is found that reprocessing leads to a significant reduction in the weight average molecular mass of PLA by 24.0% and of PCN5 by 37.3%, whereas a more uniform dispersion of clay and a stronger clay-polymer interaction are also found after reprocessing. A direct correlation between the molecular chain scission and deterioration of thermal/mechanical properties is observed both for PLA and PCN5 subjected to reprocessing cycles. The crystallization rate of PLA is suppressed by the addition of clay, while is accelerated by clay after their processing. Additionally, the presence of clay is found to reduce the differences in the thermal stability between the samples reprocessed after 1 and 4 cycles, which is ascribed to the competition between intensive chain scission and better dispersion of clay in the PLA matrix.
机译：由于聚乳酸（PLA）市场的不断增长和相对较高的价格，回收PLA的可能性引起了极大的关注，其目的是减少与PLA产品生命周期相关的环境影响。然而，再加工引起的PLA和PLA/粘土纳米复合材料的综合结构和性能变化尚不清楚。在本研究中，通过观察PLA及其有机粘土纳米复合材料（PCN5）的微观结构、热性能和机械性能的变化，对其进行1次和4次重复挤压，以揭示其回收特性。通过凝胶渗透色谱、流变学和形态分析，深入探讨了循环次数对化学结构演变和粘土分散的影响。研究发现，再处理使PLA的重均分子质量显著降低24.0%，PCN5的重均分子质量显著降低37.3%，而再处理后粘土的分散更均匀，粘土与聚合物的相互作用更强。PLA和PCN5经过后处理循环后，分子链断裂与热/机械性能恶化之间存在直接相关性。粘土的加入抑制了聚乳酸的结晶速率，而粘土在加工后加速了聚乳酸的结晶速率。此外，发现粘土的存在减少了在1次和4次循环后重新处理的样品之间的热稳定性差异，这归因于剧烈的链断裂和粘土在PLA基质中更好的分散之间的竞争。

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