Fast-responding bulk hydrogels with microstructure
Fast-responding bulk hydrogels with microstructure
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DOI：
10.1002/app.10034
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发表时间：
2002-01-03
影响因子：
3
通讯作者：
Gupta, RB
中科院分区：
文献类型：
--
作者：
Cai, WS;Gupta, RB
采用一种新的方法制备了具有高溶胀比的快速响应的具有微结构的本体水凝胶。首先通过形成聚（N-异丙基丙烯酰胺-共-丙烯酸）（NIPAAm-AA）微凝胶颗粒，然后通过将颗粒与N-异丙基丙烯酰胺单体交联来合成这些BHM。所获得的聚合物具有所需的微观结构，但为块状（整体），因此可用于各种应用。用透射电子显微镜对NIPAAm-AA微凝胶颗粒进行了表征，用扫描电子显微镜对形成的BHM进行了表征。与传统的本体水凝胶相比，BHM具有非常高的溶胀比和更快的溶胀速率，这归因于电离的微凝胶颗粒和本体水凝胶的协作。嵌入BHM中的微凝胶颗粒的增加提供了更快的水凝胶溶胀。水凝胶中离子型丙烯酸基团的数量影响其溶胀行为。(C)John Wiley & Sons，Inc.
A new method was used for the production of fast-responding bulk hydrogels with microstructure (BHMs) with a high swelling ratio. These BHMs were synthesized first by the formation of poly(N-isopropylacrylamide-co-acrylic acid) (NIPAAm-AA) microgel particles and then by the crosslinking of the particles with N-isopropylacrylamide monomer. The polymer obtained had the desired microstructure but was bulk (monolithic), so it could be used in a variety of applications. The NIPAAm-AA microgel particles were characterized with transmission electron microscopy, and the formed BHMs were characterized with scanning electron microscopy. Compared with conventional bulk hydrogels, the BHMs had very high swelling ratios and much faster swelling rates attributable to the collaboration of the ionized microgel particles and bulk hydrogels. An increase in the microgel particles embedded in the BHMs provided faster hydrogel swelling. The number of ionic acrylic acid groups in the hydrogels affected their swelling behavior. (C) 2002 John Wiley & Sons, Inc.