腈纶等离子体表面改性的时效性

采用氮气辉光放电等离子体技术处理腈纶纤维，处理后纤维表面的吸湿性能可得到显著改善，但随着放置时间的延长会逐渐退化。处理效果的衰退速度在很大程度上取决于纤维的结晶度及所放置的环境。结晶度高的样品改性后获得的亲水性能丧失较慢；放置在亲水环境中的样品没有丧失其获得的亲水特性；而放置在疏水环境中的样品却渐渐回复了其原有的疏水特性；放置在液氮中的样品其获得的亲水特性没有丧失；放置在室温及90℃高温下的样品会部分丧失其获得的亲水特性。

Ageing of plasma treated acrylic fiber

Acrylic fibers are treated by nitrogen glow-discharge plasma to improve surface wettability, However, the hydrophilic character obtained tends to decrease with time elapsed during storage, due to molecular movement in the polymer, It is found that the ageing speed is strongly dependent on the crystallinity and the environment in which the samples are stored, Increasing crystallinity reduces molecular movement of polymer chain. A hydrophobic environment and high temperature can promote faster recovery of the original properties. A hydrophilic environment can prevent the surface from losing the polar character obtained from the plasma treatment.