聚萘酰亚胺膜的制备及其气体分离性能

doi:10.11944/j.issn.1000-0518.2017.11.170042

摘要/Abstract

摘要：

利用萘二酐与邻位含脂肪族取代基的芳香二胺聚合制备了一系列均聚及共聚萘酰亚胺。这些C—N键邻位含取代基的聚萘酰亚胺可溶解于有机溶剂中并具有良好的成膜性。这些膜的拉伸强度在54~77 MPa之间,断裂伸长率在6.4%~8.1%,杨氏模量在1.3~2.2 GPa。这些聚萘酰亚胺具有优异的热稳定性,热分解温度在448~501 ℃范围内,玻璃化转变温度在382~391 ℃范围内。气体分离性能测试结果表明,聚萘酰亚胺具有突出的CO₂/CH₄分离能力,CO₂气体透过系数在37.2~151 barrer范围内,而CO₂/CH₄的选择系数在20.9~31.7的范围内,这表明了制备的聚萘酰亚胺气体分离膜材料在天然气纯化方面具有潜在的应用价值。

关键词: 萘二酐, 聚萘酰亚胺, 气体分离, 膜材料

Abstract:

A series of novel polynaphthalimides(PNIs) was synthesized from 1,4,5,8-naphthalenetracarboxylic dianhydride and several diamines containing alkyl substituents in the o-position. Almost all the PNIs with alkyl substituents in the o-position are readily soluble in polar solvents and can be solution-cast to transparent and tough films. The films have tensile strengths, elongations at break, and tensile module in the range of 54~77 MPa, 6.4%~8.1%, and 1.3~2.2 GPa, respectively. The PNIs exhibit excellent thermal stabilities with the onset decomposition temperature ranging from 448 to 501 ℃. The glass transition temperatures of the PNIs are in the range of 382 to 391 ℃. The CO₂ permeability coefficients and permeability selectivities of CO₂ to CH₄ of the PNIs are in the range of 37.2~151 barrer and 20.9~31.7, respectively, making these novel polynaphthalimides potentially useful candidate materials for membranes in natural gas purification.

Key words: naphthalene dianhydride, polynaphthalimides, gas separation, membrane material

毕伟辉, 毛鸿超, 张所波. 聚萘酰亚胺膜的制备及其气体分离性能[J]. 应用化学, 2017, 34(11): 1265-1272.

BI Weihui, MAO Hongchao, ZHANG Suobo. Synthesis, Characterization and Gas Transport Properties of Polynaphthalimides Membranes[J]. Chinese Journal of Applied Chemistry, 2017, 34(11): 1265-1272.

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