低温等离子体处理及丙烯酸接枝改性膨化聚四氟乙烯薄膜

聚四氟乙烯

【关键词】 表面改性; 聚四氟乙烯薄膜; 低温等离子体; 接枝共聚; 亲水性;
【英文关键词】 surface modification; ePTFE film; low temperature plasma; graft copolymerization; wettability;
【摘要】 采用He等离子体对膨化聚四氟乙烯(ePTFE)薄膜进行表面亲水处理,并引发接枝丙烯酸单体实现持久亲水改性。实验探究了不同等离子处理工艺和接枝工艺对ePTFE薄膜亲水性能的影响,并利用接触角、X光电子能谱(XPS)进行表征。研究结果表明,等离子体预处理后,ePTFE薄膜表面的接触角由145°降至102°;再接枝丙烯酸单体,表面接触角进一步降低,且亲水性改性效果持久。确定了等离子体预处理的优化条件:He,100 W及处理时间90 s;接枝丙烯酸改性的最佳工艺:丙烯酸浓度30%(vo.l),接枝温度70℃,接枝时间3 h。XPS结果显示,改性后ePTFE薄膜表面F/C元素比从1.960降至0.853,O/C元素比从0提高至0.147,说明氟元素被含氧基团部分取代,这是ePTFE薄膜亲水性改善的根本原因。
【英文摘要】 PTFE adheres poorly to other materials due to its low surface energy and chemical inertness,which leads to failure of PTFE in many industrial applications.To spread the applications,numerous methods for surface modification have been developed to activate the PTFE surface for improving its wettability and adhesion ability.This study focused on the surface modification of expanded poly(tetrafluoroethylene)(ePTFE)film by a two-step process based on low-pressure plasma treatment followed by acrylic acid(AAc)gr...