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以加成型硅橡胶(RT-615)为基膜,采用HF酸刻蚀的ZSM-5粒子作为填充材料,制备了高填充量ZSM-5/PDMS复合膜。通过扫描电镜(SEM)表征,发现复合膜填充量(ZSM-5:PDMS质量比)低于至100%时,复合膜表面和断面较致密,均未出现孔洞,当超过100%时,复合膜的上表面和断面出现明显微米级孔洞。将复合膜用于渗透汽化乙醇/水混合物的分离,研究发现随着ZSM-5填充量的提高,复合膜分离因子先增大后减小,这可能是由于填充量过大造成膜内的孔洞缺陷抑制了ZSM-5对乙醇选择性的提高,在填充量为70%时达到极大值21.0;复合膜渗透通量随着填充量的增大不断增加。将影响复合膜分离性能的因素分为外部因素(操作温度和料液浓度)和膜自身结构因素两部分,分别研究了各因素对复合膜渗透汽化分离性能的影响。
ZSM-5 / PDMS composite membrane with high loading was prepared by the addition of ZSM-5 with HF-acid as the base material. SEM and SEM showed that the composite film had a surface and cross-section of less than 100% when filled with ZSM-5: PDMS. No holes were found in the composite film. When the composite film was over 100% On the surface and the cross section obvious micron-scale holes. The composite membrane was used to separate the pervaporation ethanol / water mixture. It was found that the separation factor of the composite membrane first increased and then decreased with the increase of the filling amount of ZSM-5, which may be attributed to the overfilling of the pores in the membrane Defects inhibited the increase of ethanol selectivity of ZSM-5, reaching a maximum value of 21.0 at 70% loading. The permeation flux of the composite membrane increased with the increase of filling amount. The factors influencing the separation performance of the composite membranes were divided into two parts: external factors (operating temperature and feed concentration) and membrane self-structure factors. The effects of various factors on the pervaporation separation performance of the composite membranes were studied.