Abstract: Banana fiber reinforced polylactic acid (PLA) composite was prepared with ATBC as plasticizer and by adding modified banana fiber and intumescent flame retardant (IFR) into polylactic acid (PLA). The composite was the best when banana fiber was modified by silane coupling agent,with tensile strength and flexural strength 57.49MPa and 101.80MPa,respectively. The result was consistent with scanning electron microscope (SEM). The comprehensive properties of the composite was the best when intumescent flame retardant content was 5 phr,limited oxygen index reached 32.8%,vertical burning test reached V-0 (UL-94),tensile strength and flexural strength reached 43.97MPa and 87.95 MPa respectively.The result of TG showed than addition of flame retardant banana fiber could obviously increase thermal decomposition temperature and final amount of residual carbon of PLA.

Key words: polylactic acid, banana fiber, preparation, composites, surface

摘要： 采用乙酰柠檬酸三丁酯(ATBC)作为增塑剂增塑聚乳酸,添加改性香蕉纤维和膨胀型阻燃剂(IFR)制备阻燃香蕉纤维增强聚乳酸复合材料.研究结果表明,偶联剂处理纤维的效果最好,使复合材料的拉伸、弯曲强度分别达到57.49MPa、101.80MPa,与扫描电子显微镜(SEM)的结果一致;IFR含量为5份(以聚乳酸为100份计)时综合性能最佳,材料的极限氧指数达到了 32.8%,垂直燃烧实验达到了 V-0 级(UL-94),材料的拉伸和弯曲强度分别为43.97 MPa 和87.95MPa,效果最好.热失重研究结果表明,阻燃香蕉纤维的加入能明显提高聚乳酸的热分解温度和残炭量.

关键词: 聚乳酸, 香蕉纤维, 制备, 复合材料, 表面