纳米SiO_2改性聚合物渗透汽化膜

Pervaporation membrane modified by nanometer SiO_2

以丙烯酸、丙烯腈为单体,添加纳米SiO2进行水溶液共聚,由共聚物水溶液制备主体膜,并与聚乙烯醇膜复合,制备出水优先透过的3层夹芯复合渗透汽化膜.通过TG分析、机械性能测试和渗透汽化分离实验研究了纳米SiO2改性膜的性能.与不含纳米SiO2的膜相比,改性膜的热稳定性和机械稳定性明显改善.使用该膜分离甲醇质量分数98%的水溶液,膜的分离因子显著提高,且有不错的渗透通量.

Acrylic acid and acrylonitrile are synthesized by solution polymerization with nanometer SiO2. The copolymer solution is made into main body of the membrane, then compounded with the polyvinyl alcohol acetal membrane to make the three-tier sandwich composite pervaporation membrane. The performance of the modified membranes is investigated by using Thermogravimetry, mechanical testing and pervaporation experiments. The results show that, compared with the membrane without nanometer SiO2, the modified membranes have an improved thermal stability and mechanical performance. Using these membranes to separate the mixtures of methanol/water which contains 98% methanol, the results show that the selectivity of the membrane with nanometer SiO2 is improved notably and has good flux.