Thermal and Gas Adsorption Properties of Tröger's Base/Diazacyclooctane Hybrid Ladder Polymers

Keiki Inoue, Roman Selyanchyn, Shigenori Fujikawa, Fumitaka Ishiwari, Takanori Fukushima

研究成果: Contribution to journalArticle査読


A polymer of intrinsic microporosity (PIM) consisting of Tröger's base (TB) undergoes ring opening of the bicyclic amine upon N-methylation followed by alkaline hydrolysis, resulting in a hybrid ladder polymer that contains diazacyclooctane (DACO) units with tert- and sec-amino groups. The hybrid ladder polymers with various TB/DACO ratios can be prepared depending on the reaction conditions. Here we report a systematic study on the effect of DACO content on the thermal and gas adsorption properties of the hybrid ladder polymer. Using a PIM derived from 2,5-diamino-p-xylene, we prepared hybrid ladder polymers with a DACO content ranging from 19% to 55% while having a similar molecular weight. The thermal stability of the hybrid ladder polymers, evaluated by thermogravimetric analysis, is decreased with the increase in DACO content. Based on gas adsorption measurements, the increase in DACO content results in the decrease in the BET surface area but improves the gas adsorption selectivity for CO2 against N2, likely due to high basicity of the sec-amino group of DACO unit. This result demonstrates that the partial TB-to-DACO conversion of the TB-based PIM may provide a simple but useful strategy to design polymer materials that enable selective CO2 capture and/or separation.

出版ステータス出版済み - 4 26 2021

All Science Journal Classification (ASJC) codes

  • 生体材料
  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 材料化学


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