中文摘要：

利用脉冲等离子体聚合的低处理能量密度、高基团保留的特点，以醋酸乙烯酯（VAc）的脉冲等离子体聚合方法对聚丙烯（PP）表面作了改性．研究了脉冲占空比（Ton／Toff）对VAc等离子体聚合物的结构与性能的影响．聚合量随着占空比的提高呈先升高，然后在占空比150／50时降低，这是等离子体的聚A／刻蚀共同作用的结果．由于VAc等离子体聚合是通过逐步增长聚合机理（RSGP）进行的，其聚合物中含有交联结构．VAc聚合物可部分被醇解为聚乙烯醇结构，其交联结构是抑制进一步醇解的因素．但红外分析及VAc聚合物中可溶性物质含量测试结果表明，低占空比下VAc聚合物的结构破坏较轻且低交联结构较多，占空比50／150处理表面醇解后的表面水接触角降低到66．0^o，改善了载体PP表面的亲水性．

英文摘要：

Based on the advantages of lower treating energy and higher group retention, pulsed plasma polymerization method was used to modify polypropylene （PP） surfaces with vinyl acetate as the monomer. Effects of pulse duty cycles （Ton/Toff） on the surface chemistry and surface morphology of modified surfaces were investigated. Pol- ymerization amounts were found to increase with the increases of duty cycles and then decrease with the duty cycle of 150/50, it was cooperating results of both the polymerization deposit and the etch effect of plasma treatments. Followed the rapid step growth polymerization （RSGP） mechanism in plasma polymerization, plasma polymers of vinyl acetate tended to be cross-linked and the cross-link structure was responsible for the partial alcoholysis reac- tion of poly （vinyl acetate） into the poly （vinyl alcohol） structuie. However, FT-IR results and soluble measurements showed that poly （vinyl acetate） polymerized from lower duty cycles was less destroyed and less cross-linked, and a more hydrophilical surface with a contact angle of 66.0 was obtained from the alcoholyzed surface by the duty cycle of 50/150.