Effects of ultrasound on the synthesis and properties of polyurethane foam/clay nanocomposites

W. J. Seo, Y. T. Sung, S. B. Kim, Y. B. Lee, K. H. Choe, S. H. Choe, J. Y. Sung, Woo Nyon Kim

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53 Citations (Scopus)

Abstract

Polyurethane foam (PUF)/clay nanocomposites were synthesized with clay modified by polymeric 4,4′-diphenylmethane diisocyanate (PMDI) with me application of ultrasound. Transmission electron micrographs showed that the interlayer distance increased for the polyurethane (PU)/ clay nanocomposites where ultrasound was applied. The results of the transmission electron microscopy and X-ray measurements suggest that the application of ultrasound to the clay modification with PMDI improved the efficiency of the clay modification by the effective breakup of the clay agglomerates and intercalation of the silicate layers. In the mechanical tests of the PUF/clay nanocomposites, the flexural and tensile strengths of the PUF/clay nanocomposites showed the maximum value at 3.0 wt % clay content based on PMDI. These results suggest that the increases in the flexural and tensile strengths were perhaps due to the uniform dispersion of the clay by the application of ultrasound. At the same modified clay content, the fire resistance properties were increased for the PUF/clay nanocomposites with the application of ultrasound compared to the PUF/clay nanocomposites without the application of ultrasound. The cell size and thermal conductivity were decreased for the PUF/clay nanocomposites with the application of ultrasound compared to the PUF/clay nanocomposite without the application of ultrasound. Because of these results, we suggest that the smaller cell size and lower thermal conductivity of the PUF/clay nanocomposites were mainly due to the enhanced dispersion of the clay by the application of ultrasound to the mixture of PMDI and clay.

Original languageEnglish
Pages (from-to)3764-3773
Number of pages10
JournalJournal of Applied Polymer Science
Volume102
Issue number4
DOIs
Publication statusPublished - 2006 Nov 15

Keywords

  • Clay
  • Foams
  • Mechanical properties
  • Nanocomposites
  • Polyurethanes

ASJC Scopus subject areas

  • Polymers and Plastics

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    Seo, W. J., Sung, Y. T., Kim, S. B., Lee, Y. B., Choe, K. H., Choe, S. H., Sung, J. Y., & Kim, W. N. (2006). Effects of ultrasound on the synthesis and properties of polyurethane foam/clay nanocomposites. Journal of Applied Polymer Science, 102(4), 3764-3773. https://doi.org/10.1002/app.24735