Structure and permeation of organic–inorganic hybrid membranes composed of poly(vinyl alcohol) and polysilisesquioxane
Structure and permeation of organic–inorganic hybrid membranes composed of poly(vinyl alcohol) and polysilisesquioxane
复制标题
DOI：
10.1039/b806303f
复制
发表时间：
2008-09
影响因子：
--
通讯作者：
Q. Zhang;Q. Liu;F. Shi;Ying Xiong
中科院分区：
文献类型：
--
作者：
Q. Zhang;Q. Liu;F. Shi;Ying Xiong
为了解决聚乙烯醇（PVA）膜的选择性和渗透性之间的矛盾，将聚倍半硅氧烷（PSS）引入到PVA基体中，制备了具有高分离性能的有机-无机杂化膜。PSS的掺入导致杂化膜的物理和化学结构的变化。杂化膜中的结晶区域随着PSS含量的增加而减小。当PSS含量低于3wt%时，杂化膜的亲水性先增加后降低。由于PSS的聚集，杂化膜的表面和内部都形成了二氧化硅颗粒，杂化膜的表面粗糙度随PSS含量的增加而线性增加。将该杂化膜用于四氢呋喃的渗透汽化脱水，成功地解决了渗透性和选择性之间的平衡问题。当PSS含量低于2wt%时，杂化膜的选择透过性和通量同时增加，而当PSS含量高于2wt%时，选择透过性下降。含2 wt% PSS的杂化膜具有最高的分离因子1810。
Organic–inorganic hybrid membranes with high separation performance were prepared by the incorporation of polysilisesquioxane (PSS) into a poly(vinyl alcohol) (PVA) matrix in order to solve the trade-off relationship between the selectivity and permeability of PVA membranes. The incorporation of the PSS resulted in a change in the physical and chemical structure of the hybrid membranes. The crystalline region in the hybrid membranes decreased with increasing PSS content. The hydrophilicity of the hybrid membranes increased when the PSS content is below 3 wt%, and then decreased. Silica particles formed on the surface and in the interior of the hybrid membranes due to the PSS conglomeration, and the surface roughness of the hybrid membranes increased linearly with increasing PSS content. The trade-off between permeability and selectivity was successfully solved using the hybrid membranes in pervaporation dehydration of tetrahydrofuran. The permselectivity and flux of the hybrid membranes increased simultaneously when the PSS content was below 2 wt%, whereas the permselectivity decreased when the PSS content was above 2 wt%. The hybrid membrane containing 2 wt% PSS had the highest separation factor of 1810.