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The effect of surface modification of layer silicates on the thermoanalytical properties of poly(NIPAAm-co-AAm) based composite hydrogels

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Abstract

We studied the effect of variations in the composition of the 3D polymer matrix on the water adsorption properties of poly(N-isopropylacrylamide-co-acrylamide) [abbreviated as poly(NIPAAm-co-AAm)]-based gels containing fillers of diverse hydrophilicities (Na-montmorillonite and hydrophobized montmorillonite). The hydrophilicity of the polymer matrix was modified by varying the ratio of the initial monomers, since acrylamide (AAm) is hydrophilic, whereas N-isopropylacrylamide (NIPAAm) is relatively hydrophobic. Filler content was varied in the range of 1–25 wt%. The water content of polymers, fillers and composites, a parameter determined by their different hydrophilicities was characterized by gravimetry and/or thermoanalytical methods (TG, DSC). The water content of the samples was found to be controllable by varying the hydrophilicity of the polymer matrix and/or the amount and hydrophilicity of the fillers added. Swelling of the relatively hydrophobic poly(NIPAAm) can be increased by the addition of hydrophobic fillers, whereas that of the hydrophilic poly(AAm) can be enhanced by the addition of hydrophilic fillers. The effect of changes in composition on the desorption enthalpies of the samples was determined. The water content of the copolymer increases with increasing the ratio of the hydrophilic monomer, which is due to an increase in the so-called free water content. In the case of the hydrophobic poly(NIPAAm) it is primarily hydrophobic association interactions that dominate the interaction between the polymer matrix and the lamellae of the filler, whereas in the case of the hydrophilic poly(AAm) hydrophilic interactions are dominant.

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Acknowledgements

This work was supported by the Hungarian National Office of Research and Technology (NKTH) and the Agency for Research Fund Management and Research Exploitation (KPI) under contract no. RET-07/2005; and the Cooperation Research Centre (DEAK) of the University of Szeged (28/00/0R201).

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Authors and Affiliations

  1. Department of Physical Chemistry and Material Science, University of Szeged, Aradi Vt. 1, Szeged, 6720, Hungary

    László Janovák & Imre Dékány

  2. Department of Dermatology and Allergology, University of Szeged, Korányi fasor 6, Szeged, 6720, Hungary

    János Varga & Lajos Kemény

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  1. László Janovák
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Correspondence to Imre Dékány.

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Janovák, L., Varga, J., Kemény, L. et al. The effect of surface modification of layer silicates on the thermoanalytical properties of poly(NIPAAm-co-AAm) based composite hydrogels. J Therm Anal Calorim 98, 485–493 (2009). https://doi.org/10.1007/s10973-009-0311-1

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