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  • 09월 12일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제110회 대한화학회 학술발표회, 총회 및 기기전시회 안내 SYNTHESIS OF POLY (PROPYLENENE CARBONATE) AND THERMOPLASTIC POLYURETHANES HAVING FLAME RETARDING PROPERTY

등록일
2012년 8월 30일 15시 54분 39초
접수번호
1386
발표코드
POLY.P-99 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 17일 (수요일) 16:00~19:00
발표형식
포스터
발표분야
고분자화학
저자 및
공동저자
KodiyanVarghese Jobi, 이분열
아주대학교 분자과학기술학과, Korea
A preparative method for a ?ame-retarding poly(propylene carbonate) (PPC) was demonstrated by employing diphenylphosphinic acid (Ph2P(O)(OH)), phenylphosphonic acid (PhP(O)(OH)2),or phosphoric acid (P(O)(OH)3) as a chain transfer agent in the immortal CO2/propylene oxide copolymerization catalyzed by a highly active catalyst, a cobalt(III) complex of a Salen-type ligand tethered by four quarternary ammonium salts . High turnover frequencies of 10 000?20 000 h-1(700?1300 g-polymer per g-cat?h) were maintained even in the presence of a large amount of the protic chain transfer agent ([?OH]/[Cat], 1600?200). Directly after the copolymerization using PhP(O)(OH)2 as a chain transfer agent, thermoplastic polyurethane (TPU) was formed by adding a stoichiometric amount of toluene-2,4-diisocynate. The TPU also was not in?ammable. Low-molecular-weight poly(propylene carbonate)s bearing ?OH groups at both ends (PPC-diols) are prepared by feeding protic chain-transfer agents (1,2-propanediol, terephthalic acid, 2,6-naphthalenedicarboxylic acid, and phenylphosphonic acid) in the CO2/propylene oxide copolymerization catalyzed by a highly active Salen?Co(III) complex tethered by four quaternary ammonium salts. The generated low-molecular-weight PPC-diols are used in situ for the formation of thermoplastic polyurethanes through subsequent feeding of diisocyanates (4,41-methylenebis(phenyl isocyanate), 1,4-phenylene diisocyanate, and toluene 2,4-diisocyanate). By varying the structure of the fed diisocyanate and chain-transfer agent, the glass transition temperature of the polyurethane can be tuned in the range 40?60 0C. A high glass transition temperature of up to 60 0C, which is 200C higher than that of high-molecular-weight PPC itself (400C), is attained when 2,6-naphthalenedicarboxylic acid (as the chain-transfer agent) and 4,41 -methylenebis(phenyl isocyanate) are employed.

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