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Effect of surface modification of bentonite nanoclay with polymers on its stability in an electrolyte solution

  • Medical Polymers
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Abstract

Recently surface modification of clay minerals has become increasingly important for improving the practical applications of clays and clay minerals. In this research work surface modifications of bentonite nanoclay particles were carried out by chemical grafting of different copolymers including poly(1-vinyl pyrrolidone-co-styrene) (PVP), poly(methyl methacrylate-co-methacrylic acid) (PMMA) and poly (acrylamide-co-diallyl dimethyl ammonium chloride) (PDADMAC). The efficiency of the grafting reactions was investigated using FTIR, TGA and XRD methods. It was shown that PVP as well as PDADMAC copolymers had been grafted successfully on the exterior of the nanoclay tactoids surfaces, while most of the PMMA molecules had entered the galleries and grafted on the inner surfaces of the nanoclay. Turbidimetry, zeta potentiometry and dynamic light scattering (DLS), were employed to analyze the dispersion stability of the unmodified and modified nanoclays in an electrolyte solution with high salinity. The turbidimetry results showed that stabilities of unmodified and modified nanoclay particles in the electrolyte solutions decreased as the time passed from their preparation, and after 24 h they settled completely in the solutions. However, rates of the settlement of unmodified and modified particles differed from each other, that of the modified ones being lower. This difference was attributed to the grafted copolymers on the modified particles surfaces. Also, the results of the zeta potentiometry and DLS were in harmony with the turbidimetry observations.

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Authors and Affiliations

  1. Polymer Science and Technology Division, Research Institute of Petroleum Industry (RIPI), Tehran, Iran

    A. Khoshniyat, A. Sharif & J. Aalaie

  2. Composite group, Iran Polymer and Petrochemical Institute, Tehran, Iran

    A. Khoshniyat & A. Hashemi

  3. Department of Chemical Engineering, Ecole Polytechnique, Montreal, Quebec, Canada

    C. Duobis

Authors
  1. A. Khoshniyat
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  2. A. Hashemi
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  3. A. Sharif
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  4. J. Aalaie
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  5. C. Duobis
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Correspondence to A. Hashemi.

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Khoshniyat, A., Hashemi, A., Sharif, A. et al. Effect of surface modification of bentonite nanoclay with polymers on its stability in an electrolyte solution. Polym. Sci. Ser. B 54, 61–72 (2012). https://doi.org/10.1134/S1560090412010034

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  • DOI: https://doi.org/10.1134/S1560090412010034

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