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采用溶液共混法,以木粉为改性剂制备了聚乳酸基生物降解复合材料。研究了木粉用量对复合材料的玻璃化转变温度、力学性能、韧性及形态的影响,并考察了木粉的表面改性处理对复合材料韧性的影响。结果表明,木粉的添加可明显提高聚乳酸的韧性。SEM分析结果表明,木粉与聚乳酸之间的界面结合是复合材料的主要增韧机理。
Polylactic acid-based biodegradable composites were prepared by solution blending method and wood flour as modifier. The effects of the amount of wood flour on the glass transition temperature, mechanical properties, toughness and morphology of the composites were investigated. The effects of surface modification of wood flour on the toughness of the composites were also investigated. The results show that the addition of wood flour can significantly improve the toughness of polylactic acid. SEM analysis showed that the interfacial bonding between wood flour and polylactic acid was the main toughening mechanism of composites.