Intermolecular and Intramolecular Hydrogen Bonding of Poly(dimethylsiloxane)urethane-Graft-Poly(methyl methacrylate) Copolymers Based on 2,4-TDI and m-XDI

ASIA unversity > 醫學暨健康學院 > 食品營養與保健生技學系 > 期刊論文 > Item 310904400/17293

請使用永久網址來引用或連結此文件: http://asiair.asia.edu.tw/ir/handle/310904400/17293

題名:	Intermolecular and Intramolecular Hydrogen Bonding of Poly(dimethylsiloxane)urethane-Graft-Poly(methyl methacrylate) Copolymers Based on 2,4-TDI and m-XDI
作者:	洪耀釧;Albert, Y.C.Hung
貢獻者:	保健營養生技學系
關鍵詞:	copolymerization;polyurethanes;association;glass transition;macromonomers
日期:	2002
上傳時間:	2012-11-26 02:31:08 (UTC+0)
摘要:	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
關聯:	JOURNAL OF APPLIED POLYMER SCIENCE; 86(4):pages 962–972.
顯示於類別:	[食品營養與保健生技學系] 期刊論文

文件中的檔案:

檔案	描述	大小	格式	瀏覽次數
index.html		0Kb	HTML	278	檢視/開啟

在ASIAIR中所有的資料項目都受到原著作權保護.

資料載入中.....