2005 춘계 학술발표회 논문집 : 실시간 적외선분광분석법을 이용한 폴리에티렌옥사이드 폴리우레탄의 질소-알킬화 반응 연구 = Proceedings of 2005 KSIEC Spring Meeting : In-situ real-time IR monitoring of N-alkylation of poly(ethylene oxide) polyurethane

다국어 초록 (Multilingual Abstract)

The progress of N-alkylation reactions of poly (ethylene oxide) polyurethane conducting through a two-step reaction was monitored by In situ real-time infrared spectroscopy (In situ IR). Firstly, the starting polymer was metalalized with alkali metal catalyst and then the obtained urethane polyanion was treated with alkyl tosylate in DMSO/THF. In the case of 4,4-diphenylmethane diisocyanate (MDI) -based PEOPU, the absorption IR band of carbonyl at 1725 ㎝^(-1) (C=O) was shifted to 1628 ㎝^(-1) in the first step, which is due to the change of the electron environment from the formation of the anionic sites on urethane group. In second step, the band at 1628 ㎝^(-1) was shifted to 1702 ㎝^(-1), which is due to the disappearance of the anion and the formation of the N-alkyl urethane. A chemical conversion profile for post-polymerization N-alkylation reaction of PEOPU can be obtained from the monitoring of the change of the characteristic peak urethane carbonyl.