【摘要】 利用喷涂沉淀法对聚偏氟乙烯(PVDF)膜进行表面改性,考察了喷涂液中纳米粒子(NP)的浓度和纳米粒子与胶粘剂(PDMS)的质量比对聚偏氟乙烯改性膜性能的影响.测定了改性前后聚偏氟乙烯膜的表面接触角以及膜的结构变化,并研究了膜的抗润湿和抗污染性能.结果表明,当喷涂液中纳米粒子的质量浓度为1%,纳米粒子与胶粘剂的质量比为4:5时,膜表面接触角从102°提高到156°.在直接接触式膜蒸馏实验中,改性膜的抗润湿性能和抗污染性能均较改性前有较大的提高.更多还原

【Abstract】 The polyvinylidene fluride(PVDF)membrane was modified by spray-deposition.The effects of the concentration of nanoparticles and the mass ratio of nanoparticles to adhesive in the spraying solution on the modified membranes properties were studied.The properties of the membranes modified under different conditions,such as the membrane surface contact angle and surface structure,were analyzed. The results showed that the largest contact angle of the modified membrane was obtained when nanoparticles mass content was 1% and the nanoparticles to adhesive mass ratio was 4∶5 in the spraying solution.The direct contact membrane distillation(DCMD)test indicated that the properties of wetting resistance and anti-fouling of the modified membrane were improved compared with the original one.更多还原