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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。分析了表面的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。
The surface of polyvinylidene fluoride (PVDF) film was hydrophilized by low temperature plasma grafting polymerization with maleic anhydride (MAH). The MAH chemical structure of the surface was analyzed. The relationship between the plasma power, the amount of surface polymerization and the contact angle of the surface water was investigated. The long-term effect of the modified film on hot concentrated sulfuric acid was also discussed. The results show that MAH is opened on the surface of the MAH by plasma and grafted onto the surface of the MAH. The polymerization amount increases first and then decreases with the increase of the treatment power, and reaches the maximum at 30W. After the plasma treatment, the contact angle of water decreases from 97 ° 45 ° ~ 70 °, reduced to 40 ° ~ 55 ° after hydrolysis, the surface water contact angle of 30W modified membrane is the smallest; MAH polymer is not corroded and not immersed in modified concentrated sulfuric acid for 1000h Compared with the sulfuric acid sample, the contact angle of water has little change.