화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.29, No.12, 855-863, December, 2021
DOI10.1007/s13233-021-9094-4  Export Citation
CO2/Propylene Oxide Copolymerization with a Bifunctional Catalytic System Composed of Multiple Ammonium Salts and a Salen Cobalt Complex Containing Sulfonate Anions
Yeong Hyun Seo, Yong Bin Hyun, Hyun Ju Lee, Hong Cheol Lee, Jung Hyun Lee, Sun Mi Jeong, and Bun Yeoul Lee†
  • Department of Molecular Science and Technology, Ajou University, 206 Worldcup-ro, Yeongtong-gu, Suwon, Gyeonggi 16499, Korea
E-mail:
A (Salen)Co(III) complex tethering four quaternary ammonium salts with covalent bonds is one of the most highly active catalysts for CO2/epoxide copolymerization. In this work, we aimed to prepare similar (Salen)Co(III) complexes to which quaternary ammonium salts are linked via ionic interactions. Thus, multiple ammonium salts containing 2-5 quaternary ammonium salt units and (Salen)Co(III) complexes containing one or two -SO3 -[PhNH3]+ moieties were prepared. A binary catalytic system composed of the prepared multiple ammonium salts and the prepared (Salen)Co(III) complex containing -SO3 -[(nBu)4N]+ moieties showed high activity (TOF, 1500-4500 h-1) for CO2/propylene oxide (PO) copolymerization, whereas a combination of the multiple ammonium salts and the conventional (Salen)Co(III) complex not containing -SO3 -[(nBu)4N]+ moieties was inactive under the identical polymerization conditions of [PO]/[Co] = 20000. However, a substantial amount of cyclic carbonate was concomitantly generated, especially when a (Salen)Co(III) complex containing two -SO3 -[(nBu)4N]+ moieties was used (25-30%). This side-reaction could be mitigated by ca. 50% by employing a (Salen)Co(III) complex containing one -SO3 -[(nBu)4N]+ moiety. Cyclic carbonate generation can reasonably be ascribed to ammonium salts ([(nBu)4N]+[carbonate]-) not linked to the (Salen)Co(III) complex formed in the binary catalytic system.
Keywords:CO2/propylene oxide copolymerization;bifunctional catalyst;multiple quaternary ammonium salt;salen cobalt complex
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