常压介质阻挡放电等离子体处理纤维的ESR研究

摘要

In order to further understanding the mechanism of atmospheric dielectric barrier discharge, the production and influence factors of free radical trapped in fibers treated by plasma were investigated by using electron spin resonance (ESR) spectroscopy. The ESR spectra shapes and intensity of treated wool samples change with increasing the plasma time during. The absence of obvious spin signals in wool samples pre-conditioned in 100% RH before plasma treatment indicates that free radical formation is inhibited in fibers with the highest moisture regain, which could be accounted for the function of absorbed water molecules in the fiber matrix. Big differences are evident in the ESR spectrum among different type of fibers under the same plasma condition. It can be concluded that the plasma duration, fiber moisture content and macromolecular structure have great influence on the outcome of free radicals induced by the atmospheric dielectric barrier discharge.%探讨常压介质阻挡放电(DBD)等离子体的反应机理,采用电子自旋共振技术研究经DBD处理的3种典型纺织纤维所产生的自由基.分析比较了不同处理时间,不同纤维含潮率下羊毛纤维中所产生的各种自由基的电子自旋共振谱,以及同一处理条件下不同种类纤维的ESR谱.结果表明,常压DBD等离子体反应能够有效地促成纺织纤维表面自由基的生成.纤维含潮率是平行于等离子体处理时间,纤维大分子结构等参数,是影响自由基产物的重要因素之一.当纤维中的水分含量达到一定程度时,纤维回潮会抑制等离子体处理过程中自由基的生成.