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In-situ real-time IR monitoring of N-alkylation of poly(ethylene oxide) polyurethane
Kweon, Jung-Ohk,Kang, Shin-Choon,Noh, Si-Tae 한국공업화학회 2005 응용화학 Vol.9 No.1
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.
류연정,유종성,권정옥,노시태 한국공업화학회 2005 응용화학 Vol.9 No.1
Segmented polyurethanes with perfluoropolyether(PFPE) and poly(ethylene oxide) blocks were synthesized by reacting a fluorinated macrodiol(PFPE) and poly (ethylene glycol) (PEG) and methylenebis(phenyleneisocyanate) (MDI) in different ratios in the presence of a solvent. Microphase was studied as a function of fluorine and hard segment content of polyurethanes. The chemical structures were characterized by Fourier transform infrared spectroscopy(FT-IR) and thermal properties of PEO PUs and PFPE/PEO PUs investigated by differential scanning calorimetry (DSC). The relative molar ration of PFPE and PEG and MDI in the polymer played an important role in microphase morphology.
실로산 가교와 우레탄 가교 고체고분자 전해질의 열 및 전도특성
노시태,정태화,권종옥 한국공업화학회 1998 응용화학 Vol.2 No.1
Crosslink in solid polymer electrolytes(SPE) affect the improvement of mechenical properties, the destruction of crystallinity, and the elevation of conductivity. We investigated two types of SPE films which have different crosslinking structures. First, siloxane crosslinked SPE films prepared by sol-gel method have inorganic filler. Second, urethane crosslinked SPE films have the simple chemical crosslink. It has been known that inorganic-filled SPE films have excellent thermal, electrical stability and mechnical properties. In this study, we investigated the thermal and conductive properties of the SPE films having siloxane crosslink or urethane crosslink with the change of temperature and salt contents. We could prepare transparent and amorphous polymer electrolyte films. With the increase of salt content T_g increased. Comparing PEG600 to PEG1000, the T_g of PEG1000 was lower than that of PEG600. The T_g of urethane crosslink was lower than that of siloxane crosslink for PEG600. LiClO₄ was used as salt. In futher study, we will investigate the thermal and conductive properties with the inter-crosslink molecular weight of urethane crosslink.