| 학회 |
한국고분자학회 |
| 학술대회 |
2022년 봄 (04/06 ~ 04/08, 대전컨벤션센터) |
| 권호 |
47권 1호 |
| 발표분야 |
대학원생 구두발표(영어발표, 발표15분) |
| 제목 |
Monovalent Salt Induced Liquid-Liquid Phase Separation of Polyguanidinium |
| 초록 |
Liquid-liquid phase separation (LLPS) of polyelectrolyte (PE) solution, called coacervation, is induced by non-covalent intermolecular association. Especially, simple coacervation is LLPS of a single PE solution induced by adding salts that reduces Columbic repulsion. Herein, we demonstrate that LLPS of positively charged polyguanidinium solution by addition of monovalent salt. Guanidinium-functionalized poly(allyl glycidyl ether) (G-PAGE) was synthesized by anionic ring-opening polymerization and post-modification, producing ideal polymer system to investigate LLPS in aqueous media. The LLPS shows upper critical solution temperature (UCST) behavior, and the phase transition temperature is modulated by salt concentration. Also, molecular dynamics (MD) simulation, infrared (IR) spectroscopy and surface forces apparatus (SFA) results confirm that the strong π-π interaction between guanidinium moieties plays a critical role to induce the LLPS without oppositely charged PE. |
| 저자 |
오승환1, 이진훈2, 이민환3, 김슬우3, 이원보3, 이동욱2, 최수형1
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| 소속 |
1홍익대, 2UNIST, 3서울대 |
| 키워드 |
liquid-liquid phase separation; simple coacervation; upper critical solution temperature
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| E-Mail |
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