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    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/17293


    Title: Intermolecular and Intramolecular Hydrogen Bonding of Poly(dimethylsiloxane)urethane-Graft-Poly(methyl methacrylate) Copolymers Based on 2,4-TDI and m-XDI
    Authors: 洪耀釧;Albert, Y.C.Hung
    Contributors: 保健營養生技學系
    Keywords: copolymerization;polyurethanes;association;glass transition;macromonomers
    Date: 2002
    Issue Date: 2012-11-26 02:31:08 (UTC+0)
    Abstract: In this study, poly(dimethylsiloxane)urethane–graft–poly(methyl methacrylate) (PDMS urethane–g–PMMA) copolymers with low crosslinking density were synthesized. Glass transition temperatures of the copolymers were investigated by dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). Results confirm that PDMS urethane–g–PMMA is miscible in the 2,4-TDI (2,4- toluene diisocyanate) system, whereas it is partially miscible in the m-XDI (m-xylene diisocyanate) system. Free, intra- (urethane–urethane), and inter- (urethane–ester) association hydrogen bonding exist in the urethane group of copolymers. The inter-association hydrogen bonding can improve the compatibility of the copolymer components. The relationship between the frequency shift and enthalpy confirm the distribution of hydrogen bonding in the macromonomer and copolymer. Ninety percent of the hydrogen bonding is by interassociation in the 2,4-TDI system. The intra-association hydrogen bonding in the m-XDI system is higher than that in the 2,4-TDI system. Consequently, aggregation may occur easily in the siloxane-grafted chain in the m-XDI system. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 962–972, 2002
    Relation: JOURNAL OF APPLIED POLYMER SCIENCE; 86(4):pages 962–972.
    Appears in Collections:[食品營養與保健生技學系] 期刊論文

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