正硅酸四乙酯修饰Fe3O4制备磁性有机硅氧氮分离膜及其性能研究  

Preparation of magnetic PDMS/TEOS@Fe3O4 membrane by TEOS modified Fe3O4 for O2/N2 separation

作　　者：王傲生 徐积斌 白云翔 孙余凭 张春芳 Wang Aosheng;Xu Jibin;Bai Yunxiang;Sun Yuping;Zhang Chunfang(Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,School of Chemical and Material Engineering,Jiangnan University,Wuxi 214122)

机构地区：[1]江南大学,合成与生物胶体教育部重点实验室,化学与材料工程学院,无锡214122

出　　处：《化工新型材料》2020年第12期84-88,共5页New Chemical Materials

基　　金：国家自然科学基金(21576114)。

摘　　要：以高渗透性聚二甲基硅氧烷(PDMS)为基体,以正硅酸四乙酯修饰四氧化三铁(TEOS@Fe3O4)为磁性基元,采用溶剂挥发法制备了PDMS/TEOS@Fe3O4磁性有机硅膜,研究TEOS修饰作用对磁性有机硅膜氧氮渗透性能的影响。结果表明,经TEOS修饰后的Fe3O4与PDMS之间具有良好界面相容性,PDMS/TEOS@Fe3O4膜的机械性能得到显著提升。与PDMS/Fe3O4膜相比,PDMS/TEOS@Fe3O4膜的O2/N2理想选择性增加;施加外加磁场后,两种磁性膜的O2/N2理想选择性分别提高了16.2%和8.0%。当外加磁场强度为56mT时,PDMS/TEOS@Fe3O4膜的O2渗透系数为1483Barrer,O2/N2理想选择性为2.2。Fe3O4 and tetraethyl orthosilicate functionalized Fe3O4 were used as magnetic fillers into polydimethylsiloxane(PDMS)matrix,fabricated PDMS/Fe3O4 and PDMS/TEOS@Fe3O4 magnetic organosilicon membranes by solvent evaporation methods,respectively.The effect of surface modification of Fe3O4 particles on the separation performance of the membrane for O2/N2 was studied.The results indicated that modification of Fe3O4 with TEOS helps to enhance the O2/N2 selectivity of PDMS/TEOS@Fe3O4 without external magnetic field due to the enhanced interfacial compatibility.The O2/N2 selectivity of PDMS/TEOS@Fe3O4 and PDMS/Fe3O4 magnetic membranes increased by 16.2%and 8.0%,respectively.The O2 permeability coefficient of PDMS/Teos@fe3O4 was 1483 Barrer,and the ideal O2/N2 selectivity was 2.2 under external magnetic field of 56mT.The inevitable interfacial defects in PDMS/Fe3O4 can be considered to be the transport channel of O2 with low resistance under external magnetic field.Therefore,the O2/N2 selectivity of PDMS/Fe3O4 showed a large enhancement than that of PDMS/TEOS@Fe3O4.

关 键 词：聚二甲基硅氧烷 磁性有机硅膜 界面空隙 O2/N2分离 磁场 

分 类 号：TQ028.1[化学工程]