Decarboxylation-Induced Cross-Linking of Polymers of Intrinsic Microporosity (PIMs) for Membrane Gas Separation
Decarboxylation-Induced Cross-Linking of Polymers of Intrinsic Microporosity (PIMs) for Membrane Gas Separation
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DOI：
10.1021/ma300751s
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发表时间：
2012-06-26
期刊：
影响因子：
5.5
通讯作者：
Guiver, Michael D.
中科院分区：
文献类型：
--
作者：
Du, Naiying;Dal-Cin, Mauro M.;Guiver, Michael D.
通过对具有本征微孔的羧化聚合物(C-PIMs)进行热处理，制备了用于气体分离的交联膜。研究了最佳的交联温度，提出了芳基自由基热脱羧基引发的可能的交联途径，并排除了其他几种可能的机理。羧化的PIM可通过含腈的母体聚合物的受控水解而获得。用傅里叶变换红外光谱(FTIR)、热重-质谱仪(TGA-MS)、热重-红外光谱(TGA-FTIR)和凝胶含量分析对其进行了表征。脱羧基PIM(DC-PIM)膜对O-2/N-2、CO2/N-2和CO2/CH4气体对具有较高的选择性，在高CO2压力下抑制了溶胀致密化。
Cross-linked membranes for gas separation have been prepared by thermal treatment of carboxylated polymers of intrinsic microporosity (C-PIMs). The optimal cross-linking temperature was investigated and possible cross-linking pathways involving aryl radical-induced thermal decarboxylation are provided, while several other possible mechanisms are ruled out. Carboxylated PIMs are accessible by controlled hydrolysis of the nitrile-containing parent polymer. The resulting cross-linked PIMs were insoluble in typical solvents and were characterized by Fourier transform infrared spectroscopy (FTIR), TGA-MS, TGA-FTIR, and gel content analysis. The decarboxylated PIM (DC-PIM) membranes showed higher selectivities for the O-2/N-2, CO2/N-2, and CO2/CH4 gas pairs, with evidence of suppression of swelling-induced densification under high CO2 pressure.