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Issue 17, 2018
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Preparation of irrefrangible polyacrylamide hybrid hydrogels using water-dispersible cyclotetrasiloxane or polyhedral oligomeric silsesquioxane containing polymerizable groups as cross-linkers

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Abstract

In this study, polyacrylamide (PAAm) hybrid hydrogels were prepared using water-dispersible single-structured cyclotetrasiloxane (CyTS-MNa) or polyhedral oligomeric silsesquioxane (POSS-MNa) containing polymerizable groups as cross-linkers, and the mechanical properties of the resulting hybrid hydrogels were evaluated. First, CyTS-MNa and POSS-MNa were prepared by the reaction of our previously reported cistranscis cyclotetrasiloxane or polyhedral oligomeric silsesquioxane containing propylammonium trifluoromethanesulfonate groups with maleic anhydride, followed by neutralization with NaOH/methanol solution. The aqueous dispersions (1.0 wt%) of CyTS-MNa and POSS-MNa showed Tyndall effects. In addition, the dynamic light-scattering analysis performed on CyTS-MNa and POSS-MNa indicated that submicrometer aggregates were formed in water. Then, PAAm-CyTS-MNa and PAAm-POSS-MNa hybrid hydrogels were prepared by the free-radical polymerization of acrylamide (AAm) monomer in the presence of the resulting cross-linkers (CyTS-MNa and POSS-MNa), which can form aggregates in water, using potassium peroxodisulfate as an initiator in degassed water under an argon atmosphere at 65 °C. The hybrid hydrogels prepared using CyTS-MNa (feed molar ratio to AAm: 1.25%) and POSS-MNa (feed molar ratio to AAm: 0.625% and 1.25%) as cross-linkers exhibited a flexible nature (low elasticity) that resisted a strain of 97%.

Graphical abstract: Preparation of irrefrangible polyacrylamide hybrid hydrogels using water-dispersible cyclotetrasiloxane or polyhedral oligomeric silsesquioxane containing polymerizable groups as cross-linkers

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Publication details

The article was received on 02 Mar 2018, accepted on 02 Apr 2018 and first published on 03 Apr 2018


Article type: Paper
DOI: 10.1039/C8PY00354H
Citation: Polym. Chem., 2018,9, 2302-2312
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    Preparation of irrefrangible polyacrylamide hybrid hydrogels using water-dispersible cyclotetrasiloxane or polyhedral oligomeric silsesquioxane containing polymerizable groups as cross-linkers

    M. Yanagie and Y. Kaneko, Polym. Chem., 2018, 9, 2302
    DOI: 10.1039/C8PY00354H

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