为提高复合材料的性能,采用稀土改性剂对玻璃纤维进行表面处理,研究了改性剂中稀土含量对玻璃纤维增强不饱和聚酯复合材料拉伸和弯曲性能的影响,并与硅烷偶联剂SG-Si900的改性效果进行了对比;用扫描电子显微镜对复合材料拉伸试样断口进行了分析.结果表明:与硅烷偶联剂相比,稀土改性剂能有效改善玻璃纤维与不饱和聚酯的界面结合强度,从而提高复合材料的力学性能;经稀土改性剂处理复合材料的力学性能随稀土含量的增加先升后降,当稀土质量分数为0.3%时,最大拉伸和弯曲载荷最高,分别比硅烷偶联剂处理的提高了21%和26%.

In order to improve the properties of the composite,rare earth (RE) modifier was used for the surface modification of glass fibers.The effect of RE concentration in the modifier on tensile properties and bending properties of the glass fiber reinforced unsaturated polyester composites was investigated.The modification effect of the RE modifier was compared to that of the silane coupling agent SG-Si900 (SGS).The fracture surfaces of tensile specimens were analyzed by scanning electron microscopy.The results show that comparing with the silane coupling agent,RE modifier was effective in promoting the interfacial adhesion strength between glass fibers and unsaturated polyester,that could improve the mechanical properties of the composite.The mechanical properties of the composites modified with the RE modifier increased and then decreased with the increase of RE concentration.The maximum tensile and bending loads,which were improved by about 21% and 26% independently compared with those of SGS treated composites,were obtained when the RE concentration was 0.3%.