New copolyimide membranes for the pervaporation of trichloroethylene from water
New copolyimide membranes for the pervaporation of trichloroethylene from water
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DOI：
10.1016/j.memsci.2004.10.002
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发表时间：
2005-02-15
影响因子：
9.5
通讯作者：
Lee, SB
中科院分区：
文献类型：
--
作者：
Chang, BJ;Chang, YH;Lee, SB
通过改变柔性硅氧烷二胺与刚性含氟芳香二胺的比例，制备了一系列新型的共聚酰亚胺膜，并考察了二胺比例对三氯乙烯（TCE）的物理和渗透汽化性能的影响。以4，4 '-（六氟异亚丙基）二邻苯二甲酸酐、双（3-氨丙基）封端的聚二甲基硅氧烷（SIDA）和2-（全氟己基）乙基-3，5-二氨基苯甲酸酯（PFDAB）为原料，采用一步热亚胺化法合成了该膜。核磁共振和ATR/IR观察证实了不同SIDA/PFDAB比例的聚酰亚胺的成功制备，热分析表明，聚酰亚胺具有两个玻璃化转变温度，表明它们是微相分离的。的结晶d间距，分数自由体积，和聚酰亚胺的表面自由能的测定作为SIDA含量的函数。研究了SIDA含量对TCE/水混合物的吸附、扩散和渗透性能的影响。(C)2004 Elsevier B. V.保留所有权利。
We have prepared a series of new copolyimide membranes by varying the ratio of flexible siloxane diamines to rigid fluorinated aromatic diamines, and have examined the influence of the diamine ratio on the physical and pervaporation properties of trichloroethylene (TCE) from water. The membranes were synthesized from 4,4'-(hexafluoroisopropylidene) diphthalic anhydride, bis(3-aminopropyl) terminated poly(dimethylsiloxane) (SIDA), and 2-(perfluorohexyl) ethyl- 3,5-diaminobenzoate (PFDAB) using a one-step thermal imidization process. Nuclear magnetic resonance and ATR/IR observations confirmed that the polyimides with different SIDA/PFDAB ratios were successfully prepared, and thermal analysis showed that the copolyimides exhibited two glass transition temperatures, indicating that they were micro-phase separated. The crystallographic d spacing, fractional free volume, and surface free energy of the polyimides were measured as a function of SIDA content. The effect of the SIDA content on the membranes' sorption, diffusion, and permeation properties of TCE/water mixtures was also investigated. (C) 2004 Elsevier B.V. All rights reserved.