植物纤维增强聚乳酸发泡材料的研究进展

目的 建立基于电感耦合等离子质谱(ICP-MS)技术的总有机锡迁移量分析方法，用于食品接触材料中总有机锡的快速筛查。方法 使用四氢呋喃溶解法筛选出添加有机锡类热稳定剂的试样，采用水和体积分数为4%的乙酸模拟物进行迁移试验，迁移温度为20 ℃和40 ℃，迁移时间为10 d，同时比较常规浸泡迁移和超声加速迁移的结果，对检测方法的精密度、准确度进行了确认。结果 总有机锡迁移测定方法在质量浓度为0.13~13 μg/L时呈良好的线性关系，采用体积分数为4%的乙酸模拟物迁移的检出限为0.011 μg/L，定量限为0.033 μg/L;水模拟物迁移的检出限为0.0097 μg/L，定量限为0.029 μg/L。总有机锡加标回收率范围为98.1%~109.9%，相对标准偏差(RSD)<4.5%。结论 此方法具有灵敏度高、选择性好和准确性高等特点，适用于PVC包装材料中总有机锡迁移量快速分析。

Recent Progresses on Plant Fiber Reinforced Polylactic Acid Foaming Materials

The work aims to summarize the recent progresses on plant fiber reinforced polylactic acid foaming materials so as to provide a reference for the preparation and performance research of polylactic acid foaming materials. The classification was carried out according to the foaming method and the properties of plant fiber/PLA composite foam materials prepared by different foaming methods were introduced. The effects of plant fiber added to supercritical CO2 foaming method on the properties of foaming materials were mainly reviewed. The research of PLA foaming material reinforced by plant fiber was in the stage of laboratory research. The cell size of PLA foaming material added with plant fiber was more uniform and smaller, and the density increased. The mechanical properties were also improved. The mechanical and other properties of PLA foaming materials can be enhanced by adding plant fiber. The research on plant fiber and PLA composite foaming materials is of great significance for large-scale production of PLA foaming materials.