超高分子量聚乙烯(UHMWPE)纤维表面处理对UHMWPE/环氧树脂复合材料界面性能的影响机制

从工程化应用角度研究了常压空气等离子体改性对超高分子量聚乙烯（UHMWPE）纤维/环氧树脂复合材料界面性能的调节机制，主要分析了不同处理时间对UHMWPE纤维表面状态变化的影响，及其对UHMWPE/环氧树脂复合材料界面黏结性能的影响规律。采用SEM及纤维吸水测试研究了等离子体处理对UHMWPE纤维表面物理形貌及纤维表面浸润性能的影响，分别以拉伸和弯曲的方式，通过纤维表面脱黏力及层合板层间剪切强度对UHMWPE/环氧树脂复合材料的界面黏结性能进行表征。结果表明，仅经过4 s的空气等离子体处理之后，UHMWPE纤维表面脱黏力的提高幅度为84.0%，UHMWPE/环氧树脂复合材料层合板的层间剪切强度由未处理的7.01 MPa提高至15.81 MPa，增幅高达125.5%。研究发现，通过常压空气等离子体处理改变了UHMWPE纤维的表面状态，可以显著高效地调节UHMWPE/环氧树脂复合材料的界面性能，为扩大该材料的后续工程化应用提供了理论基础。 

Influence mechanism of ultra high molecular weight polyethylene(UHMWPE) fiber surface modification on interfacial performance of UHMWPE/epoxy composites

The interface-regulating mechanisms of atmospheric air plasma modification for ultra high molecular weight polyethylene (UHMWPE) fiber/epoxy composites were investigated from the perspective of engineering application. The influence of plasma treatment duration on UHMWPE fiber surface properties and the interfacial adhesion of UHMWPE/epoxy composites was mainly researched. The SEM and surface water absorption tests were chosen as characterization methods to study the effects on UHMWPE fiber surface morphologies and surface wettability, respectively. Furthermore, the UHMWPE/epoxy composite interfacial adhesion was characterized based on both of the fiber surface adhesion test and the interlaminar shear strength test of laminates by using the stretching load and the bending load, respectively. The results show that the UHMWPE fiber surface adhesion is increased by 84.0% after plasma treatment for only 4 s, and specially the interlaminar shear strength value of UHMWPE/epoxy composite laminates is increased from 7.01 MPa to 15.81 MPa with the increment of 125.5%. These results indicate that the interfacial properties of UHMWPE/epoxy composites can be regulated notably and effectively by UHMWPE fiber surface air-plasma treatment, providing a theoretical basis for its subsequent expanded engineering application.