Abstract Bamboo particle (BP)-reinforced poly(lactic acid) (PLA) biocomposites were fabricated. The effect of the BP particle size distribution on the pyrolysis and mechanical properties of PLA biocomposites was evaluated. The optimum particle size of BP for improving the tensile strength PLA biocomposites is 200 mesh (16.6–84.5 µm). The pyrolysis mechanism and kinetics were studied according to the Coats–Redfern method. The addition of BP inhibited the pyrolysis process of PLA. The activation energy of biocomposites ranged from 120.7 to 151.5 kJ/mol, which is significantly higher than that of the neat PLA. The pyrolysis mechanisms of biocomposites are attributed to the chemical reaction at low pyrolysis temperature (270–400℃) and ash layer diffusion control at high pyrolysis temperature (400–600℃). Crystallization behavior of biocomposites showed that small BPs in PLA biocomposites generated more cross-linking points in the PLA matrix, which constrained the movement of the molecular chain and acted as an effective nucleating agent in promoting the crystallization process. The pyrolysis behavior and mechanical properties analysis provide critical information for potential large-scale production of the PLA biocomposites. Graphical abstract

中文翻译：

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聚乳酸/竹颗粒生物复合材料的热解动力学和机械性能：粒度分布的影响

摘要 制备了竹粒子 (BP) 增强的聚乳酸 (PLA) 生物复合材料。评估了 BP 粒径分布对 PLA 生物复合材料的热解和机械性能的影响。用于提高拉伸强度 PLA 生物复合材料的 BP 的最佳粒径为 200 目（16.6-84.5 µm）。根据 Coats-Redfern 方法研究热解机制和动力学。BP的加入抑制了PLA的热解过程。生物复合材料的活化能范围为 120.7 至 151.5 kJ/mol，明显高于纯 PLA。生物复合材料的热解机制归因于低热解温度（270-400℃）下的化学反应和高热解温度（400-600℃）下的灰层扩散控制。生物复合材料的结晶行为表明，PLA 生物复合材料中的小 BPs 在 PLA 基质中产生更多的交联点，这限制了分子链的运动，并作为促进结晶过程的有效成核剂。热解行为和机械性能分析为 PLA 生物复合材料的潜在大规模生产提供了关键信息。图形概要