PHOTOGELATION AND REDOX PROPERTIES OF ANTHRACENE DISULFIDE-MODIFIED POLYOXAZOLINES
PHOTOGELATION AND REDOX PROPERTIES OF ANTHRACENE DISULFIDE-MODIFIED POLYOXAZOLINES
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DOI：
10.1021/ma00073a012
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发表时间：
1993-10-11
期刊：
影响因子：
5.5
通讯作者：
SAEGUSA, T
中科院分区：
文献类型：
--
作者：
CHUJO, Y;SADA, K;SAEGUSA, T
部分水解的聚(N-乙酰基乙烯亚胺)(PAEI)与(9-蒽基)甲基氢3,3'-二硫代二丙酸酯在二环己基碳二亚胺(DCC)作为缩合剂存在下反应制备了同时具有蒽和二硫基团的聚恶唑啉。这种光敏 PAEI 用 450 W 高压汞灯（λ > 300 nm）照射产生 PAEI 凝胶，该凝胶在水中溶胀并显示出特征性水凝胶特性。在水中的平衡溶胀度由照射时间和蒽部分的取代度控制。吸水量高达干凝胶重量的20倍。光交联的 PAEI 凝胶通过二硫键交联的还原断裂而变得可溶。光反应凝胶化和还原裂解构成了一种新型的光敏和氧化还原敏感的水凝胶体系。
Polyoxazoline having both anthracene and disulfide groups was prepared by the reaction of partially hydrolyzed poly(N-acetylethylenimine) (PAEI) with (9-anthracenyl)methyl hydrogen 3,3'-dithio-dipropanoate in the presence of dicyclohexylcarbodiimide (DCC) as a condensing agent. This photosensitive PAEI was irradiated with a 450-W high-pressure Hg lamp (lambda > 300 nm) to produce a PAEI gel, which was swollen in water and showed characteristic hydrogel properties. The equilibrium swelling degree in water was controlled both by the irradiation time and by the degree of substitution of the anthracene moieties. The water uptake was up to 20 times the weight of the dry gel. The photo-cross-linked PAEI gel became soluble by the reductive cleavage of disulfide cross-links. The gelation by photoreaction and the cleavage by reduction constitute a novel photosensitive and redox-sensitive hydrogel system.