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采用模压工艺制备不饱和聚酯(UP)树脂/大麻纤维复合材料,研究了105℃下热氧老化600h前后复合材料力学性能的变化;采用傅立叶变换红外光谱仪(FTIR)对老化前后复合材料的结构进行对比分析,并通过SEM技术观察复合材料的断面形貌。结果表明,偶联剂KH570处理对复合材料力学性能的总体改善效果最佳。老化600h后,偶联剂处理复合材料具有的最佳力学性能如拉伸强度、拉伸模量、弯曲强度、弯曲模量及冲击强度分别为19.06MPa、5.78GPa、52.988MPa、1.01GPa和3.881kJ/m~2。红外分析显示,偶联剂处理得到的复合材料在老化前后的红外图形变化不明显,有些吸收峰甚至得到了加强。SEM结果表明,老化600h后,偶联剂处理的复合材料中纤维仍能较均匀地分散在树脂基体中,两者间的界面粘结良好。
The unsaturated polyester (UP) resin / hemp fiber composites were prepared by compression molding. The mechanical properties of composites before and after thermal aging at 105 ℃ for 600h were investigated. The structure of composites before and after aging was analyzed by Fourier transform infrared spectroscopy (FTIR) The comparative analysis was conducted and the cross-sectional morphology of the composite was observed by SEM. The results show that the coupling agent KH570 has the best overall improvement on the mechanical properties of the composites. After aging 600h, the best mechanical properties such as tensile strength, tensile modulus, flexural strength, flexural modulus and impact strength of the coupling agent treated composites were 19.06MPa, 5.78GPa, 52.988MPa, 1.01GPa and 3.881 kJ / m ~ 2. Infrared analysis shows that the infrared spectrum changes of the composite treated by the coupling agent are not obvious before and after aging, and some absorption peaks are even strengthened. The SEM results showed that the fibers in the composite treated with coupling agent could still be dispersed more evenly in the resin matrix after aging for 600h, and the interfacial bonding between the two was good.