Effects of Bamboo Powder Content and Modification on the Properties of Polylacticacid-based Bamboo-plastic Composites
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摘要: 以竹粉和聚乳酸作为原料，采用热压成型工艺制备聚乳酸基竹塑复合材料。研究了竹粉含量以及不同改性方法对竹塑复合材料性能的影响。试验结果表明：在一定范围内，随着竹粉含量的增加，该材料的平衡转矩、拉伸强度、弯曲强度及吸水率呈现上升趋势，当竹粉含量超过50%时，拉伸强度和弯曲强度开始呈现下降趋势，而流动性能、结晶度和冲击强度总体呈现下降趋势。对竹粉表面分别进行了碱处理改性和硅烷偶联剂改性，相较于未改性的竹粉/聚乳酸复合材料，碱处理提高了复合材料的结晶度，偶联剂改性降低了复合材料的结晶度，这2种改性后的复合材料的力学性能均有所增强，竹粉与聚乳酸的界面相容性提高，而吸水率则有所下降，其中硅烷偶联剂改性对复合材料性能的提升更为明显。Abstract: Using bamboo powder and polylactic acid as raw materials,a polylactic acid-based bamboo-plastic composite material was prepared by the hot press molding method. The effects of bamboo powder content and different modification methods on the properties of wood-plastic composites were studied. The results indicated that within a certain range,with the increase of bamboo powder content,the equilibrium torque,tensile strength,bending strength and water absorption of the material showed an upward trend. When the bamboo powder content exceeded 50%,the tensile strength and the bending strength showed a downward trend,while the flow performance,crystallinity and impact strength showed an overall downward trend. The surface of bamboo powder was modified by alkali treatment and silane coupling agent. Compared with the unmodified bamboo powder/polylactic acid composite material,the crystallinity of the composite material was increased by the alkali treatment,while decreased by the coupling agent modification. In order to improve the crystallinity of the composite material,the mechanical properties of the two modified composite materials have been enhanced,the interface compatibility of bamboo powder and polylactic acid has been improved,while the water absorption has decreased. Among them,modification of silane coupling agent improved the performance of composite materials more obviously.
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Key words:
- Polylacticacid /
- Bamboo powder /
- Bamboo-plastic composite /
- Surface modification
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