等离子体表面改性玻璃纤维增强的环氧树脂性能研究

本文基于水轮发电机定子绝缘材料的性能,采用介质阻挡放电在空气中大气压下对无碱玻璃纤维进行表面改性实验,考察改性时间对玻璃纤维表面形貌及化学组成成分变化的影响。其次,用不同处理时间下的玻璃纤维掺杂双酚A型环氧树脂,并制备成复合材料,分别测试了复合材料的拉伸、弯曲等力学参数,对比分析低温等离子体改性时间对复合材料力学性能的影响。实验结果表明,经等离子体处理180s后,玻璃纤维表面出现许多刻蚀坑,并且引入了O-C=O含氧官能团,O-C=O基团含量从未处理的0%上升到7.9%,而复合材料的拉伸、弯曲强度也分别提高了30.97%、37.5%。分析表明,低温等离子体的化学刻蚀作用引起的玻璃纤维表面形貌的变化,以及表层极性基团的引入,是玻璃纤维表面活化处理中的主导过程。采用等离子体表面活化后的玻璃纤维增强环氧树脂,可以使复合材料的力学性能得到显著提高。

Study on Mechenical Properties of Surface Modification of E-Glass Fiber by Low Temperature Plasma Reinforced Epoxy Resin Composites

The study based on the performance of stator insulation material of hydrogenerator, E-glass fiber was modified by dielectric barrier discharge at atmospheric pressure. And the effect of modification time on surface morphology and chemical composition of E-glass fiber was analyzed. And then, using modified E-glass fiber with different treatment time reinforced epoxy resin. The mechanical parameters such as tensile strength and flexural strength of composites were measured. The effect of low temperature plasma modification time on the mechanical properties of composites was analyzed. The results show that after the plasma treatment of 180s, etching pits appeared obviously on the surface of E-glass fiber, and O-C=O oxygen containing functional group was introduced, the content of O-C=O oxygen containing functional group increased from 0% to 7.9%. The tensile strength and flexural strength of the composites increased by 30.97% and 37.5% respectively. The analysis shows that the change of the surface morphology of E-glass fiber caused by chemical etching of low temperature plasma and the introduction of the polar group of the surface layer are the dominant processes in the activation treatment of E-glass fiber surface. After low temperature plasma treatment of E-glass fiber, the mechanical properties of composites were improved significantly.