椰壳纤维/IPC复合材料的应力-应变曲线拟合及界面改进

Stress-Strain Curve Fitting and Interfacial Modification of Coir/IPC Composites

采用扫描电子显微镜、万能材料试验机对椰壳纤维/抗冲共聚聚丙烯(IPC)界面改进复合材料的断面形貌、力学性能进行了研究。利用高斯函数模型拟合椰壳纤维/IPC复合材料的应力-应变曲线,得到其数学表达式,计算曲线下的面积,得到各料的韧性模量。结果表明,马来酸酐接枝聚丙烯(MAH-g-PP)作为相容剂改性的复合材料各项力学性能均明显高于钛酸酯偶联剂的。而钛酸酯改性的复合材料又明显高于未界面改性的。扫描电镜(SEM)分析结果表明,MAH-g-PP改性的复合材料界面粘接明显好于钛酸酯的,这是复合材料力学性能提高的根本原因。

The morphology of fracture surfaces and mechanical properties of coir/impact copolymer polypropylene（IPC） were studied by scanning electron microscopy（SEM） and an universal testing machine.Stress-strain curves of the composites were fit using Gaussian function,and the mathematical expressions were obtained.The toughness modulus of the materials was obtained by calculating the area under the curves.The results show that the maleic anhydride grafted polypropylene（MAH-g-PP） compatibilizer makes a significantly better improvement on the mechanical properties of the composites than the titanate coupling agent.And the composite modified with titanate coupling agent has better mechanical properties than that without interface modification.SEM analysis show that the interfacial bond of the composite modified with MAH-g-PP is much better than the composite modified with the titanate coupling agent,and that is the radical reason why the mechanical properties of composites are improved.