低温等离子体表面处理对超高分子量聚乙烯纤维-环氧树脂粘接性能的影响及机理

超高分子量聚乙烯纤维与环氧树脂的粘接性能很差,给高性能轻型复合材料的研制带来困难。本文采用低温等离子体对纤维表面进行处理。结果表明,处理后的纤维表面能提高,使环氧树脂能良好地浸润纤维,纤维与环氧树脂间粘接强度可提高5-8倍。粘接性能改善的原因是:由表面引入的多种含氧基团所形成的化学键力,由表面刻蚀坑产生的机械嵌合力。

EFFECT OF LOW-TEMPERATURE PLASMA SURFACE TREATMENT ON THE ADHESION OF UHMW-PE FIBRES TO EPOXY RESIN AND STUDY OF THE MECHANISM

The poor adhesion of ultra-aigh molecular weight poly-ethylene fibres to epoxy resin due to the characteristics of their surface structure makes it difficult to develop light composite materials with good mechanical properties. In this paper the low-temperature plasma was applied to treat the surfaces of the fibres. The results show that the sur-face energy of the treated fibres increases greatly so that the fibres can be wetted very well by resin,and that the adhesion strength of the treated fibres to resin increases significantly by about 5-8 times. In the paper the mechanism of the improvement of the adhesion has been discussed. The varieties of polar oxygen containing groups produced in the surface layer which form chemical bonding and the plasma etched pits spreading all over the surface of the treated fibres into which the resin penetrates to form the mechanical interlocking between fibre and resin are the two reasons for the improvement.