期刊
APPLIED CLAY SCIENCE
卷 103, 期 -, 页码 46-54出版社
ELSEVIER
DOI: 10.1016/j.clay.2014.11.009
关键词
Hydrogel nanocomposite; Kaol; Polyacrylamide; Poly(aciylic acid); Inverse dispersion polymerization; Intercalated morphology
资金
- Romanian Ministry of Education and Research, PCCA [114/2012]
- ERA NET MANUNET Project NASIPONAC [7-074/2013]
- Danish Ministry of Science Technology and Innovation [08-034101]
Novel nanocomposite hydrogel structures based on cross-linked poly(acrylic acid) (PAA) and kaolinite (Kaol), modified with different loadings of polyacrylamide (PAAm), were prepared by inverse dispersion polymerization. Ceric ammonium nitrate as an initiator in the presence of nitric acid was used to graft PAAm from the Kaol surface. The surface-modified Kaol showed enhanced interactions between the filler and the PM matrix, through interactions between amino (-NH2) from PAAm and carboxylic groups (-COOH) from PM. The XRD and TEM measurements confirmed the exfoliated nanocomposites with the Kaol filler. The swelling degree (SD) of the swollen hydrogel nanocomposite was increased following the addition of polyacrylamide-modified Kaol particles into the hydrogel structures. Rheological characterization showed that an increase in the storage modulus (G') could be a consequence of a good dispersion of Kaol particles in the polyacrylic acid matrix, thereby leading to enhanced interactions and furthermore to improved mechanical properties of the final hydrogels. (C) 2014 Elsevier B.V. All rights reserved.
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