界面改性对竹纤维增强聚乳酸复合材料性能的影响

Effect of Interface Modification on Properties of Bamboo Fiber Reinforced Poly(lactic acid)Composites

分别以0.5%(质量分数,下同)、1.0%、1.5%和2.0%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MDI用量对复合材料界面、力学性能、热性能的影响。结果表明,MDI可以改善竹纤维和聚乳酸界面相容性;随着MDI用量的增加,复合材料拉伸强度逐渐增大,冲击强度先增大后减小;MDI添加量为1.5%时,复合材料拉伸强度和冲击强度分别达到最大值63.4MPa和11.3kJ/m2;随着MDI用量的增加,复合材料的储能模量逐渐增大,损耗因子逐渐降低,玻璃化转变温度、结晶温度和热分解温度逐渐升高,热稳定性增加。

Bamboo fiber was surface modified with isocyanate （MDI） and used to reinforce poly（lactic acid） through injection molding. Interface, mechanical, and thermal properties of the resulted composites were investigated. As MDI addition increased, tensile strength of composites gradually increased,impact strength first increased and then decreased. When MDI addition was 1.5%, tensile strength and impact strength of composites reached the maximum of 63.4 MPa and 11.3 kJ/m2, respectively. The storage modulus of composites gradually increased, loss factor gradually decreased, glass transition temperature, temperature of composites increased, thermal stability content. crystallization temperature and pyrolysis of composites increased with increasing MDI