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采用空气低温等离子体改善超高相对分子质量聚乙烯(UHMWPE)短纤维的黏着性,设计正交试验对改性后纤维的黏着性进行测试与分析,确定出较优试验方案;然后对未处理和经较优方案改性后的UHMWPE短纤维的表面形貌、表面化学成分、表面润湿性和强伸性进行测试分析。结果表明:空气低温等离子体改性UHMWPE短纤维黏着性的较优处理条件为功率50 W、压强15 Pa、反应时间120 s,此时,纤维的剥离功是未处理的4.14倍,黏着性得到了大幅度的提升,且单纤维强力损失率仅为3.29%;经较优方案处理后,纤维表面的粗糙程度有所增加,表面润湿性有明显改善,纤维表面的C元素含量明显减少,O、N元素含量有所增加,且出现了相对含量为22.2%的C=O官能团,有利于UHMWPE短纤维黏着性的改善。
Low temperature plasma was used to improve the adhesion of ultra-high molecular weight polyethylene (UHMWPE) staple fibers. The orthogonal design was used to test and analyze the adhesiveness of the modified fibers, and the optimal experimental scheme was determined. And the surface morphology, surface chemical composition, surface wettability and extensibility of the UHMWPE staple fiber modified by the optimal scheme were tested and analyzed. The results showed that the optimum conditions for the adhesion of air-plasma modified UHMWPE short fibers were 50 W of power, 15 Pa of pressure and 120 s of reaction time. At this time, the peel power of fibers was 4.14 times of untreated fiber, , And the rate of loss of single fiber strength was only 3.29%. After the optimal treatment, the roughness of fiber surface increased, the surface wettability improved obviously, the content of C element on fiber surface decreased obviously, O, N content increased, and the relative content of 22.2% appeared C = O functional groups, is conducive to UHMWPE short fiber adhesion improvement.