自愈水凝胶
材料科学
共单体
吸水率
甲基丙烯酸酯
化学工程
聚合物
肿胀 的
多孔性
相(物质)
甲基丙烯酸羟乙基酯
吸收(声学)
高分子化学
复合材料
有机化学
化学
共聚物
工程类
作者
Olga Shimoni,Michael S. Silverstein
出处
期刊:Soft Matter
[The Royal Society of Chemistry]
日期:2007-01-01
卷期号:3 (12): 1525-1525
被引量:124
摘要
Hydrogels, such as those based on poly(2-hydroxyethyl methacrylate) (PHEMA), are hydrophilic three dimensional network structures that undergo extensive swelling in water. PolyHIPEs are highly porous, crosslinked polymers typically synthesized within high internal phase emulsions (HIPEs). This research describes materials with enhanced water absorption that combine hydrogel water absorption with capillary action by synthesizing PHEMA-based polyHIPEs within oil-in-water HIPEs. The variation in the ,-methylenebisacrylamide (MBAM) crosslinking comonomer content yields a narrow synthesis window in which water-swollen micro-gel particles phase separate, agglomerate, and form a heterogeneous polyHIPE wall structure with nanoscale porosity. Surprisingly, a hydrogel polyHIPE with a relatively high MBAM content also had the highest surface area and the highest water absorption. Ultimately, it is the influence of the MBAM content on the polymer hydrophilicity and on the porous structure that determines its effects on the properties.
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