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通过双螺杆挤出机共混制备了不同方法改性的木纤维/聚乳酸可生物降解复合材料,利用DSC、SEM、DMA、冲击和拉伸力学性能测试等手段,对比分析了木纤维的不同改性处理方式对复合材料热性能、界面形态和力学性能的影响.结果表明:复合材料的聚乳酸结晶动力学明显得到改善,木纤维促进了聚乳酸的异相成核过程.改性后的木纤维聚乳酸复合材料界面结合和力学性能均得到明显改善,以性能最优的硅烷偶联剂处理的木纤维和聚乳酸复合材料为例,其拉伸应力(62.1MPa)、杨氏模量(4525.0tMPa)和冲击强度(11.5k J/m~2)比纯聚乳酸分别提高2.9%,36.0%和14.0%.
The wood fiber / polylactic acid biodegradable composite materials modified by different methods were prepared by the twin-screw extruder. The differences of wood fiber were analyzed by means of DSC, SEM, DMA, impact and tensile mechanical properties test The results show that the crystallization kinetics of polylactic acid in the composite is obviously improved and the wood fiber promotes the heterogeneous nucleation of polylactic acid. The interfacial bonding and mechanical properties of wood fiber polylactic acid composites are obviously improved. Take the best performance of silane coupling agent treated wood fiber and polylactic acid composite material as an example, the tensile stress (62.1MPa), Young’s modulus (4525.0 tMPa) and impact strength (11.5k J / m ~ 2) increased by 2.9%, 36.0% and 14.0% respectively compared with pure polylactic acid.