玻璃纤维布/苎麻纤维布混杂增强不饱和聚酯树脂的研究

Study on unsaturated polyester resin reinforced by glass cloth and ramie cloth hybrid

采用玻璃纤维布与苎麻纤维布混杂增强不饱和聚酯(UP)树脂制备复合材料,研究玻纤布与苎麻布的相对比例及偶联剂处理对复合材料力学性能的影响,研究了不同复合材料的吸水性并与玻璃纤维复合材料和苎麻纤维复合材料二者进行了比较。结果表明,混杂纤维增强复合材料的拉伸强度、拉伸模量随混杂纤维中苎麻布含量的增加而下降,弯曲强度及弯曲模量在混杂纤维中苎麻布与玻纤布的比例为10∶20和15∶15时分别达到最大值188.09 MPa和1.56 GPa;所有偶联剂处理均可明显改善复合材料的拉伸模量及弯曲模量,硅烷类偶联剂的效果更佳,NDZ401可使复合材料的拉伸强度得到最大幅度(37.66%)的提高,而KH570及NDZ401对改善弯曲强度效果最佳;复合材料吸水后,厚度变化率大于宽度变化率,温度升高,复合材料吸水后尺寸变化率及吸水率均增大,混杂纤维复合材料的吸水率与玻纤布复合材料的吸水率相近,远低于苎麻布复合材料的吸水率。

Glass fibre cloth and ramie fibre cloth hybrid were employed to reinforce unsaturated polyester（UP） resin. The effect of the relative proportion of glass cloth to ramie cloth and treating the hybrid cloth with titanated coupling agents NDZ101, NDZ401 and silane coupling agents KH550, KH570 on the mechanical properties of the composites were studied, the water adsorption of the composites was investigated compared with those of both glass cloth composites and ramie cloth composites. The results showed that the tensile strength and modulus decreased with the relative content of ramie cloth in the hybrid fibre, and the composites got the greatest flexural strength and modulus, 188.09 MPa and 1.56 GPa, when the proportions of ramie cloth to glass cloth were 10 to 20 and 15 to 15 respectively. All the coupling agents could improve both the tensile and flexural modulus of the composites. NDZ401 could improve the tensile strength increasing best by 37.66% and both NDZ401 and KH570 were the best for the improvement of flexural strength. After absorbing water, the composites expanded in thickness heavier than in width, the higher the temperature, the greater the dimensional expansions were, the water uptaken by hybrid reinforced composites was near that by glass cloth composites but far more than that by ramie cloth composites.