竹炭和壳聚糖对聚氯乙烯基木塑复合材料界面性能的影响

以杨木粉为填充材料，聚氯乙烯（PVC）为基体材料，添加竹炭和壳聚糖，采用挤出成型制备竹炭和壳聚糖改性木粉/PVC木塑复合材料，采用SEM观察复合材料表面微观形貌，采用综合热分析仪分析复合材料的热稳定性，采用FTIR分析其官能团变化，测试了木粉/PVC木塑复合材料的力学性能。结果表明:复合添加竹炭和壳聚糖可较好地改善木粉和PVC的界面作用力和界面相容性，提高复合材料的力学性能，其拉伸强度、冲击强度、弯曲强度和弯曲模量分别比未添加增加14.6%、28.8%、11.1%和4.85%，且复合材料的微观界面缺陷较少；竹炭可提高复合材料的热稳定性，复合添加竹炭和壳聚糖可增加复合材料中羟基、氨基和亚甲基的数量，减弱碳氯键的结合强度，从而增强复合材料中木粉和PVC的界面结合力。 

Effects of bamboo charcoal and chitosan on interfacial property of polyvinyl chloride based wood-plastic composites

With poplar wood flour as filling material, polyvinyl chloride (PVC) as matrix materials, by adding bamboo charcoal and chitosan, bamboo charcoal and chitosan modified wood powder/PVC wood-plastic composites were prepared by extrusion molding. The surface micro morphology of the composites was observed by SEM. The thermostability and the functional group variation of the composites were analyzed by comprehensive thermal analyzer and FTIR, respectively. And the mechanical properties of the wood flour/PVC wood-plastic composites were also measured. The results show that the compound of bamboo charcoal and chitosan could effectively improve the interface reaction and interface compatibility between wood flour and PVC and increase the mechanical properties of the composites. The tensile strength, impact strength, flexural strength and flexural modulus of the composites added bamboo charcoal and chitosan increase 14.6%, 28.8%, 11.1% and 4.85% compared with those of wood flour/PVC composites, respectively, and the micro interface defect of the composites was less. Bamboo charcoal could enhance the thermostability of the composites. The compound of bamboo charcoal and chitosan could increase the amount of hydroxyl, amidogen and methylene groups in the composites, and decrease the adhesive strength of carbon-chlorine bond, which will reinforce the interface bonding force between wood flour and PVC of composites.