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Moisture dependence of the properties of composites made from tung oil based polyurethane and wood flour

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Abstract

Natural composites prepared from a polyurethane (PU) based on tung oil and different percentages of wood flour (WF) or microcellulose (MC) were exposed to humid environments and the resulting changes of their properties were evaluated. The equilibrium moisture content of the composites increased with the wood flour percentage. Dynamic mechanical tests performed during temperature scans revealed the changes resulting from moisture absorption on the main transition temperature of the matrix as well as on the storage modulus. The tensile mechanical properties of the materials were also strongly affected by moisture. The different degree of dispersion achieved during the incorporation of WF and MC into the matrix was considered the main reason for the different effect of each filler on the thermal and mechanical properties of the resulting composites.

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Acknowledgements

The authors thank for the financial support to National Research Council of Republic Argentina (CONICET), Science and Technology National Promotion Agency and National University of Mar del Plata. The authors also thank to Cooperativa Agrícola de Picada Libertad in Argentina and Hunstman for supplying tung oil and pMDI, respectively.

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Authors and Affiliations

  1. Institute of Materials Science and Technology (INTEMA), University of Mar del Plata - National Research Council (CONICET), Av. Juan B. Justo 4302, 7600, Mar del Plata, Argentina

    M. A. Mosiewicki, U. Casado, N. E. Marcovich & M. I. Aranguren

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  1. M. A. Mosiewicki
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  2. U. Casado
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  3. N. E. Marcovich
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  4. M. I. Aranguren
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Correspondence to M. A. Mosiewicki.

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Mosiewicki, M.A., Casado, U., Marcovich, N.E. et al. Moisture dependence of the properties of composites made from tung oil based polyurethane and wood flour. J Polym Res 19, 9776 (2012). https://doi.org/10.1007/s10965-011-9776-2

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  • DOI: https://doi.org/10.1007/s10965-011-9776-2

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