竹纤维质量分数对竹纤维增强聚乳酸复合材料性能影响

Effect of BF mass fraction on properties of BF reinforced polylactic acid composites

以1.5%异氰酸酯(MDI)界面改性剂改性处理后的竹纤维和聚乳酸为原料,通过注射成型工艺制备竹纤维增强聚乳酸复合材料,探讨竹纤维质量分数对复合材料界面、力学性能、吸水率、热性能的影响。结果表明,随着竹纤维质量分数的增加,复合材料拉伸强度、冲击强度、存储模量以及热稳定性均先增大后减小,24h吸水率逐渐增大,损耗因子逐渐降低。竹纤维质量分数为50%时,复合材料的拉伸强度和冲击强度分别达到最大值63.2MPa和11.6kJ/m2,复合材料存储模量最大,热稳定性最好。

Bamboo fiber reinforced polylactic acid composites was prepared by injection molding technology with polylactic acid and the bamboo fiber modified with 1.5% isocyanate （MDI） interfacial modifier. Effect of BF mass fraction on interface, mechanical property, water absorption and thermal property of composites were in- vestigated. The results showed that tensile strength, impact strength, storage modulus and thermal stability of composites first increased and then decreased with increase of BF mass fraction, 24h water absorption gradually increased, loss factor gradually increased. When BF mass fraction was 50%, tensile strength and impact strength of composites arrived the maximum of 63.2MPa and 11.6kJ/m^2 , respectively, composites presented the highest storage modulus and the best the thermal stability.