MAH等离子体改性PVDF薄膜表面的亲水性研究

以马来酸酐(MAH)低温等离子体接枝聚合的方法对聚偏氟乙烯(PVDF)薄膜表面进行亲水改性.分析了袁面的MAH化学结构;考察了等离子体功率与表面聚合量和表面水接触角的关系;讨论了改性薄膜在热浓硫酸中长期作用的结果.结果表明:等离子体使MAH在表面双键打开并接枝聚合;聚合量随处理功率的增加呈先上升后下降的趋势,30W时最大;经过等离子体处理后,水接触角由97°下降至45°～70°,水解后降低至40°～55°,30W的改性膜表面水接触角最小;改性薄膜在热浓硫酸中作用1000h后,MAH聚合物没有被腐蚀掉,与未浸泡硫酸试样相比,水接触角变化不大.

Study on hydrophilicity of PVDF film modified by maleic anhydride plasma polymerization

PVDF film was surface modified by the low-temperature plasma polymerization technique with maleic an-hydride as the monomer. Surface chemical structure of modified film was investigated. Effect of plasma power on surface polymer amount and contact angles of the modified PVDF film was discussed. The change of modified film in heated sulfu-ric acid solution was researched. The result showed that MAH was found polymerizing with the double bond under plasma treatment, accompanied by ring-opening reaction of anhydride ring. As the plasma power increased, MAH polymer a-mount contented a trend of rise first then fall The polymer amount had a maximum under 30W. The surface contact angles of the modified films were decreased to 45°～70° after modified, then decreased again to 40°～55° after hydrolyzed. The contact angle of modified film had a minimum under 30W. After dipping in heated sulfuric acid solution 1000h, the MAH polymer wasn't corroded. The contact angle of modified film dipping in heated sulfuric acid solution had little compared with the one didn't dip in heatedsulfuric acid solution.