Fast synthesis of temperature-sensitive PNIPAAm hydrogels by microwave irradiation
Fast synthesis of temperature-sensitive PNIPAAm hydrogels by microwave irradiation
复制标题
微波辐射快速合成温敏PNIPAAm水凝胶
DOI：
10.1016/j.eurpolymj.2008.01.014
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发表时间：
2008-04-01
影响因子：
6
通讯作者：
Lin, Yuesheng
中科院分区：
文献类型：
--
作者：
Zhao, Zhenxia;Li, Zhong;Lin, Yuesheng
提出了一种制备温敏性聚N-异丙基丙烯酰胺(PNIPAAm)水凝胶的新方法--微波辐射合成法。分别采用微波辐射法和水浴加热法合成了PNIPAAm水凝胶。用FT-IR、DSC和SEM对PNIPAAm水凝胶的化学基团、低临界溶解温度(LCST)和表面形态进行了表征。结果表明：(1)与水浴加热法相比，微波辐射可以将合成PNIPAAm水凝胶所需的反应时间从几小时缩短到几分钟，并且明显提高了凝胶的产率，反应时间短，凝胶的产率可达99%；(2)扫描电子显微镜和织构测试表明，微波辐射合成的凝胶具有更多的孔结构，其平均孔径和比表面积大于水浴加热合成的凝胶；(3)与水浴法相比，微波辐射合成的PNIPAAm水凝胶在低于LcST温度10.0℃时具有较高的溶胀率，而在高于LcST温度为60.0℃时具有较低的溶胀率。(C)2008爱思唯尔有限公司。保留所有权利。
A novel method, microwave irradiation synthesis, is proposed for the preparation of thermo-sensitive poly(N-isopropylacrylamide) (PNIPAAm) hydrogels. The PNIPAAm hydrogels were separately synthesized by using microwave irradiation method and water-bath heating method. Chemical groups, lower critical solution temperature (LCST) and surface morphology of these PNIPAAm hydrogels were characterized by FT-IR, DSC and SEM. Swelling ratios of the gels were measured gravimetrically in the temperature range from 10.0 to 60.0 degrees C. Results showed that (1) the use of microwave irradiation can greatly shorten the reaction time required for PNIPAAm hydrogel synthesis from several hours to several minutes in comparison with water-bath heating method, and obviously improve the yields of the PNIPAAm gels, which were tip to 99% after a short reaction time; (2) SEM micrographs and textural measurement revealed that the gels synthesized using microwave irradiation had more porous structure, and their average pore sizes and specific surface areas were larger than those of the gels synthesized using water-bath heating method; and (3) the PNIPAAm hydrogels synthesized using microwave irradiation had much higher swelling ratios at 10.0 degrees C below the LCST, and had lower swelling ratio at 60.0 degrees C above the LCST compared to the hydrogels synthesized by water-bath method. (c) 2008 Elsevier Ltd. All rights reserved.