期刊
RSC ADVANCES
卷 7, 期 24, 页码 14504-14510出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra00372b
关键词
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资金
- National Natural Science Foundation [21663032, 51541301]
- Natural Science Fundamental Research Program Key Projects of Shaanxi Province [2016JZ005]
- Key Laboratory Research Program of the Education Department of Shaanxi Provincial Government [15JS121]
- National Research Fund for Fundamental Key Projects [2014CB931802]
Superabsorbent hydrogels with excellent mechanical properties are fabricated by introducing organic montmorillonite (OMMT) into poly(acrylic acid) (PAA) hydrogels via simple UV irradiation polymerization. The obtained OMMT/PAA composite hydrogels are composed of a three-dimensional macroporous network structure. The effects of deionized water and OMMT content on the UV-induced polymerization progress were systematically investigated. OMMT/PAA composite hydrogels with superior water absorbency and excellent mechanical properties can be obtained when the initial amount of deionized water is 95.7% (the ratio is H2O/(H2O + AA) in weight) and the content of OMMT is 10% (the ratio is OMMT/(OMMT + AA) in weight). The maximum water absorbency in deionized water is 2786 g g(-1) due to the highly reactive hydroxy groups in OMMT, which is more than 5 times higher than that of PAA hydrogels (545 g g(-1)). The OMMT/PAA containing 10% OMMT has excellent elasticity and can be stretched up to 2200% for a fresh-prepared hydrogel. It can also sustain a load weight of 650 g, and has excellent recoverability. The compressive stress-strain measurements also verify that the OMMT/PAA hydrogel containing 10% OMMT has obviously improved mechanical properties compared to the others. The combination of high water absorbency, excellent elasticity mechanical properties, efficient recoverability and facile preparation provides a new way for fabricating high-performance hydrogel materials.
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