Linear High Molecular Weight Ladder Polymers by Optimized Polycondensation of Tetrahydroxytetramethylspirobisindane and 1,4-Dicyanotetrafluorobenzene

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• 作者：Jingshe Song ; Naiying Du ; Ying Dai ; Gilles P. Robertson ; Michael D. Guiver ; Sylvie Thomas ; Ingo Pinnau
• 刊名：Macromolecules
• 出版年：2008
• 出版时间：October 28, 2008
• 年：2008
• 卷：41
• 期：20
• 页码：7411-7417
• 全文大小：173K
• 年卷期：v.41,no.20(October 28, 2008)
• ISSN：1520-5835

文摘

A study on the optimization of conditions for polycondensation of 3,3,3′,3′-tetramethyl-1,1′-spirobisindane-5,5′,6,6′-tetrol, TTSBI, with 1,4-dicyanotetrafluorobenzene (DCTB) in dimethylformamide (DMF) at 50−70 °C is reported. A linear PIM-1 polymer (PIM = polymer with intrinsic microporosity) with high molecular weight was obtained by optimized reaction conditions. Of the solvents tested, DMF was the preferred solvent for this reaction. The optimized molar ratio TTSBI/DCTB/K₂CO₃ was 1/1/2.04. The mechanism of PIM-1 cross-linking during polymerization was studied, and gel-free, high molecular weight PIM-1 polymer was prepared. The physical properties of anhydrous K₂CO₃ significantly affected the reaction rate. Flexible tough polymer films were cast from PIM-1 solution in chloroform, and pure permeability data are reported for several gases.