Abstract
A series of polyacrylamide nanocomposite hydrogels were synthesized by in situ free radical polymerization of acrylamide (AAm) with ethylene glycol dimethacrylate (EGDMA) as a crosslinker in the presence of sodium montmorillonite (NaMMT) and organically modified montmorillonite (OrgMMT) clays. Modification of MMT was carried out with a quaternary salt of coco amine as intercalant having a styryl group whose contribution to both polymerization and crosslinking reactions via its reactive double bond was confirmed by solid state NMR. Exfoliation success was checked with X-ray diffraction (XRD) and atomic force microscopy (AFM) techniques whereas mechanical performance was followed with uniaxial compression experiment. It has been found that exfoliated PAAm nanocomposites having 0.5% OrgMMT had both the maximum equilibrium swelling in water and compression strength as well as improved thermal stability due to the special and beneficial morphology observed via scanning electron microscopy (SEM).
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Supports given by Bogazici University Research Foundation (projects no. BAP5705), Yalova University Scientific Research Projects Coordination Department (Projects no. 2010–003) and Scientific and Technological Research Council of Turkey (TUBİTAK) (Project no. 110 M029) are gratefully acknowledged.
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Helvacıoğlu, E., Aydın, V., Nugay, T. et al. High strength poly(acrylamide)-clay hydrogels. J Polym Res 18, 2341–2350 (2011). https://doi.org/10.1007/s10965-011-9647-x
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DOI: https://doi.org/10.1007/s10965-011-9647-x