화학공학소재연구정보센터
학회 한국고분자학회
학술대회 2022년 봄 (04/06 ~ 04/08, 대전컨벤션센터)
권호 47권 1호
발표분야 Virtual Lightning Session
제목 Controlled Radical Polymerization by Alkali Metal Lewis-Base Hydrogen Atom Transfer Catalyst
초록 Hydrogen atom transfer (HAT) mediators are useful for radical chemistry in chemical synthesis. HAT is involved in the termination step of radical reactions between hydrogen atom and carbon-centered radical. This work focused on the kinetic aspects of the Lewis base-catalyzed, complexation-induced hydrogen atom transfer (LBCI-HAT) polymerization by evaluating the following key factors: (1) the extent of para-substituted styrene bearing electron-withdrawing and electron-donating groups, the coordinating agents effects, and (3) ligand effects in the presence of LB. The FT-NIR allows the time-resolved measurement of monomer conversion in radical polymerization to study polymerization reaction kinetics. The coordinating agent, 18-crown-6-ether, has a significant influence on the polymerization rate. The value of –dln[M]/dt obtained by linear fitting of the first-order kinetic plots of the monomer conversion was 11×10–2 s–1 for the presence of 18-crown-6-ether. In addition, the polymerization rate of styrene without a substituent showed four times faster than that of the EDG-substituted styrene (St-OMe). Moreover, we elucidated the LBCI-HAT-radical polymerization pathways and structure-reactivity correlation in LBCI-HAT. The LBCI-HAT-radical polymerization offers the scope of controlled polymer architectures in open air.
저자 Saerona Kim1, Gyu Leem2
소속 1State Univ. of New York, 2State Univ. of New York/The Michael M. Szwarc Polymer Research Institute
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