Accessing Siloxane Functionalized Polynorbornenes via Vinyl-Addition Polymerization for CO2 Separation Membranes

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• 作者：Kevin R. Gmernicki ; Eunice Hong ; Christopher R. Maroon ; Shannon M. Mahurin ; Alexei P. Sokolov ; Tomonori Saito ; Brian K. Long
• 刊名：ACS Macro Letters
• 出版年：2016
• 出版时间：July 19, 2016
• 年：2016
• 卷：5
• 期：7
• 页码：879-883
• 全文大小：254K
• 年卷期：0
• ISSN：2161-1653

文摘

The vinyl addition polymerization of norbornyl-based monomers bearing polar functional groups is often problematic, leading to low molecular weight polymers in poor yield. Herein, we provide proof-of-principle evidence that addition-type homopolymers of siloxane substituted norbornyl-based monomers may be readily synthesized using the catalyst trans-[Ni(C₆F₅)₂(SbPh₃)₂]. Polymerizations using this catalyst reached moderate to high conversion in just 5 min of polymerization and produced siloxane-substituted polymers with molecular weights exceeding 100 kg/mol. These polymers showed excellent thermal stability (T_d ≥ 362 °C) and were cast into membranes that displayed high CO₂ permeability and enhanced CO₂/N₂ selectivity as compared to related materials.