121st General Meeting of the KCS

Type Poster Presentation
Area Polymer Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code POLY.P-13
Subject Development of thermo-responsive microgel networks via supramolecular assembly of terpyridine-modified microgels
Authors Eun Jung Choi, Seonggyun Ha, Changsik Song*
Department of Chemistry, Sungkyunkwan University, Korea
Abstract We developed a terpyridine-functionalized microgel (tpy-mG) for its supramolecular assembly. Tpy-mG was synthesized by amidation between 3-(4-([2,2':6',2''-terpyridin]-4'-yl)phenoxy)propan-1-amine and carboxylates of thermo-responsive p(NIPAM-co-MAA) microgel (A-mG). After introducing terpyridine, its effects on the hydrodynamic radius, volume phase transition temperature (VPTT), and the colloidal stability of the microgel were investigated by dynamic light scattering and zeta potential analysis. The tpy-mG show reversible assembly and disassembly with several metal ions (Ni2+, Fe2+, Co2+, or Zn2+), and the rheological properties of assembled tpy-mG-M2+ were regulated depending on the metal ion type; the weakly bound ions (Co2+, Zn2+) indicated fast dynamics for “inter-particular” exchange, resulting in much higher storage (G’) and loss (G”) modulus. The tpy-mG can easily furnish Ru dyes as photocatalyst through metal-ligand interactions, and the photo-oxidation of benzylamine was tested. The free Ru dye showed no significant differences on conversions at 25 and 50 °C, while the assembled Ru-tpy-mG-Mg2+ exhibited reduced conversion at 50 °C (>VPTT). This is said that the collapsed or “locked” structure around the photocatalytic center (Ru) caused low conversion than that of 25 °C (
E-mail cej9658@gmail.com