采用壳聚糖季铵盐(HACC)改性钠基蒙脱土(HACC-MMT)、OMMT、Na-MMT及柠檬酸酯类增塑剂(ATBC)分散于聚乳酸/热塑性淀粉(PLA/TPS)材料中,使用熔融挤出法制得复合材料。测试不同配比复合后材料的力学性能和可降解性能,探索改性MMT增强增韧机理。结果表明:HACC-MMT含量为8%以内时PLA/TPS材料拉伸强度变化幅度较小;不同蒙脱土增强效果为HACC-MMT>OMMT>Na-MMT;改性后材料60天最高降解率达44.5%。
Chitosan quaternary ammonium salt (HACC) modified sodium montmorillonite,OMMT,Na-MMT and plasticizer were used,and dispersed in thermoplastic starch (TPS) and polylactic acid (PLA).Then the composite prepared by melt extrusion.The mechanical properties and degradability of the composites were studied,and explored the mechanism of montmorillonite reinforcement or toughening.The results shown that the toughening effect of PLA/TPS was moderated when HACC-MMT content was 8%.The overall strengthening effect of different montmorillonites was:HACC-MMT>OMMT>Na-MMT.The highest degradation rate of the modified material after 60 days was 44.5%.
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