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학술발표회초록보기

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제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Characterization of synthesized cyclic Poly(ethylene Oxide) by Liquid Chromatography at the Critical Condition.

등록일
2011년 8월 1일 14시 42분 27초
접수번호
1141
발표코드
Ⅳ-POLY.P-54 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 <발표Ⅳ>
발표형식
포스터
발표분야
고분자화학
저자 및
공동저자
정윤철
포항공과대학교 첨단재료과학, Korea
Ring polymers are of interest due to the topological influence of the polymer chains on their physical properties.1 A number of theoretical and experimental studies on ring polymers have been reported. Among the various methods used to synthesize ring polymers, anionic polymerization has been the most widely employed method to produce ring polymers with narrow molecular weight distribution, in particular high molecular weight ones. The basic strategy is to form precursor polymers with two carbanion end groups and to have them react intramolecularly with a difunctional electrophile to close the ring. However, the cyclization reaction does not go to completion and side reactions produce linear polymers and dimeric and higher molecular weight polymers. In this work, we fractionated ring polymers from mixture of ring polymers (polyisoprene, poly(ethylene oxide)) and their side products by liquid chromatography at the chromatographic critical condition (LCCC). In LCCC separation, LCCC utilizes the compensation of size exclusion and interaction effect of polymer chains with porous packing materials in chromatographic separation. At the critical condition for a linear polymer species, the retention of linear polymers becomes independent of molecular weight while the retention of ring polymers depends on molecular weight and differs from that of linear polymers.

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