化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (12) : 84-88. DOI: 10.19817/j.cnki.issn 1006-3536.2020.12.021

新材料与新技术

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

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

Wang Aosheng, Xu Jibin, Bai Yunxiang, Sun Yuping, Zhang Chunfang

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Received		Published
2019-08-21		2020-12-20
Issue Date	Revised Date
2021-01-21	2019-08-21

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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。

Abstract

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

Key words

polydimethylsiloxane / magnetic organosilicon membrane / interfacial defect / O₂/N₂ separation / magnetic field

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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[J]. 化工新型材料, 2020, 48(12): 84-88 DOI:10.19817/j.cnki.issn 1006-3536.2020.12.021

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基金资助

国家自然科学基金(21576114)

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