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Morphology and properties of waterborne adhesives made from hybrid polyacrylic/montmorillonite clay colloidal dispersions showing improved tack and shear resistance

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Abstract

The morphology and adhesive properties of waterborne films from n-butyl acrylate/methyl methacrylate/montmorillonite clay hybrid polymer latexes which were synthesized by miniemulsion polymerization in the presence of a reactive organoclay ((2-methacryloylethyl) hexadecyldimethylammonium modified montmorillonite, CMA16) were investigated. It was found by cryo-TEM analysis that the hybrid dispersions were a mixture of colloidal particles composed of a small fraction of free montmorillonite clay platelets, polymer latex particles, polymer particles to which one or more clay platelets where adhered onto its surface and a fraction of colloidal material consisted of a clay platelet with a polymer lob adhered to either side, in other words hybrid particles with a dumbbell-like morphology. The films made from these waterborne hybrid dispersions presented a homogeneous dispersion of the clay platelets and exfoliated morphology. The shear adhesion failure temperature (SAFT) and shear resistance of the hybrid latex films synthesized with CMA16 were better than those prepared with a commercial clay (Cloisite 30B), but presented a liquid-like probe-tack performance. When allyl methacrylate (AMA) was added in the formulation, SAFT and shear resistance improved, but the film had a very low energy of adhesion due to the excessively crosslinked matrix. In order to reduce crosslink density and thus improve the adhesion energy, small amounts of chain transfer agent, in this case n-dodecyl mercaptan (n-DDM), were used in the miniemulsion polymerization process. Adhesive films made from these waterborne hybrid dispersions showed excellent SAFT and shear resistance, and good energy of adhesion.

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Acknowledgements

Financial supports from the European Union (Napoleon project NMP3-CT-2005-011844) and Basque Government (GV-IT-303-10) and Ministerio de Ciencia y Innovación (CTQ 2006-03412) are gratefully acknowledged. BASF is acknowledged for funding (RFAT). The sGIKer UPV/EHU for the electron microscopy facilities of the Gipuzkoa unit and SGI/IZO-sGIker UPV/EHU (supported by the “National Program for the Promotion of Human Resources within the National Plan of Scientific Research, Development and Innovation-Fondo Social Europeo, Gobierno Vasco and MCyT”) is also gratefully acknowledged. Part of the equipment used in this research was obtained through Birmingham Science City: Innovative Uses for Advanced Materials in the Modern World (West Midlands Centre for Advanced Materials Project 2) with support from Advantage West Midlands (AWM). The authors would like to thank the Electron Microscopy Facility, School of Life Sciences, University of Warwick (Welcome Trust grant reference: 055663/Z/98/Z) for instrument use and technical support and especially to Ian Portman for his help in the preparation of the samples and the cryo-TEM pictures.

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Authors and Affiliations

  1. Institute for Polymer Materials, POLYMAT, Kimika Aplikatua Saila, University of the Basque Country UPV/EHU, Joxe Mari Korta Zentroa, Tolosa Hiribidea 72, 20018, Donostia-San Sebastián, Spain

    Audrey Bonnefond, Matej Mičušík, Maria Paulis & Jose R. Leiza

  2. Department of Composite Materials, Polymer Institute Slovak Academy of Sciences, Du´ bravska´ cesta 9, 842 36, Bratislava, Slovakia

    Matej Mičušík

  3. Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK

    Roberto F. A. Teixeira & Stefan A. F. Bon

Authors
  1. Audrey Bonnefond
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  2. Matej Mičušík
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  3. Maria Paulis
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  4. Jose R. Leiza
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  5. Roberto F. A. Teixeira
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  6. Stefan A. F. Bon
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Corresponding author

Correspondence to Jose R. Leiza.

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Bonnefond, A., Mičušík, M., Paulis, M. et al. Morphology and properties of waterborne adhesives made from hybrid polyacrylic/montmorillonite clay colloidal dispersions showing improved tack and shear resistance. Colloid Polym Sci 291, 167–180 (2013). https://doi.org/10.1007/s00396-012-2649-3

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