Swelling/deswelling kinetics of PNIPAAm hydrogels synthesized by microwave irradiation
Swelling/deswelling kinetics of PNIPAAm hydrogels synthesized by microwave irradiation
复制标题
微波辐射合成的PNIPAAm水凝胶的溶胀/消溶胀动力学
DOI：
10.1016/j.cej.2007.12.009
复制
发表时间：
2008-09
影响因子：
15.1
通讯作者：
Li, Z.
中科院分区：
文献类型：
--
作者：
Xi, H. X.;Xia, Q. B.;Lin, Y. S.;Bajalis, E.;Zhao, Z. X.;Li, Z.
研究了微波辐射法和常规水浴加热法合成的聚N-异丙基丙烯酰胺（PNIPAAm）水凝胶的溶胀和去溶胀动力学。测定了PNIPAAm水凝胶在低于和高于最低临界溶解温度（LCST）的水中的溶胀和去溶胀动力学曲线，并估算了其溶胀和去溶胀动力学参数。用加速比表面积仪、孔隙率仪和扫描电镜对PNIPAAm水凝胶的结构和表面形貌进行了表征。讨论了结构性质对其溶胀和去溶胀动力学行为的影响。结果表明，PNIPAAm水凝胶的溶胀和去溶胀速率均随温度的升高而增大，且去溶胀速率大于溶胀速率。与常规方法合成的PN水凝胶相比，微波辐射合成的PM水凝胶具有更大的溶胀和去溶胀速率常数以及更低的溶胀/去溶胀活化能，这是由于其具有更大的比表面积和更大的孔径，因此具有更快的响应行为。
This work involves the study of swelling and deswelling kinetics of poly(N-isopropylacrylamide) (PNIPAAm) hydrogels separately synthesized by means of microwave irradiation and normal water-bath heating. The swelling and deswelling kinetic curves of the PNIPAAm hydrogels were measured in water below and above the lower critical solution temperature (LCST), and their swelling and deswelling kinetic parameters were estimated. Textural properties and surface morphology of these PNIPAAm hydrogels were characterized by accelerated surface area and porosimetry apparatus and SEM. The effects of textural properties on their swelling and deswelling kinetic behavior were discussed. Results showed that swelling and deswelling rates of the synthesized PNIPAAm hydrogels increased with temperature, and the deswelling rates of these hydrogels were higher than their swelling rates. As compared with the PN hydrogel synthesized by the conventional method, the PM hydrogel synthesized by microwave irradiation had larger swelling and deswelling rate constants as well as lower swelling/deswelling activation energy due to its higher surface area and larger pore sizes, and thus it had faster response behavior.
登录
查看更多内容
影响因子：
--
作者：
C. L. Bell;N. Peppas
通讯作者：
C. L. Bell;N. Peppas
影响因子：
3
作者：
Gerald Oster
通讯作者：
Gerald Oster
影响因子：
2.6
作者：
I. Colombo;M. Grassi;M. Fermeglia;R. Lapasin;S. Pricl
通讯作者：
I. Colombo;M. Grassi;M. Fermeglia;R. Lapasin;S. Pricl
影响因子：
5.5
作者：
Serizawa, T;Wakita, K;Akashi, M
通讯作者：
Akashi, M
影响因子：
5.5
作者：
Meyer, S;Richtering, W
通讯作者：
Richtering, W