期刊
EUROPEAN POLYMER JOURNAL
卷 68, 期 -, 页码 630-640出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2015.03.061
关键词
Nanocomposite gel; Zwitterionic polymer; Polysulfobetaine; Swelling; Thermosensitivity; Polymer-clay network
资金
- Ministry of Education, Science, Sport and Culture of Japan [23350117]
- Grants-in-Aid for Scientific Research [15H03870, 23350117] Funding Source: KAKEN
The swelling and thermosensitive behaviors of zwitterionic nanocomposite gels (Zw-NC gels) consisting of sulfobetaine polymer-exfoliated clay networks were investigated in water and aqueous NaCl solutions and compared with those of physically and chemically crosslinked zwitterionic gels and non-zwitterionic NC gels. Zw-NC gels showed different swelling behavior that was strongly dependent on the salt concentration (C-NaCl), clay concentration (C-clay), and temperature. In water, characteristic swelling-to-deswelling behavior and an abnormal increase in the degree of swelling (DS) with increasing C-clay (proportional to crosslink density) were observed. These behaviors were in stark contrast to those obtained with other types of zwitterionic gels. In NaCl solutions, spontaneous deswelling disappeared within small C-NaCl and above the critical point (0.01 M), the DS increased with C-NaCl via an anti-polyelectrolyte effect of the zwitterions and decreased with increasing C-clay. The transparency also changed depending on the C-NaCl C-clay, swelling time, and thermosensitivity of the sulfobetaine polymer. These swelling behaviors and transparency changes of Zw-NC gels were explained by the combined effects of the zwitterionic polymers (anti-polyelectrolyte), ionic clay (polyelectrolyte), and clay as a crosslinker. (C) 2015 Elsevier Ltd. All rights reserved.
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