Areerat, Surat

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Areerat, Surat
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Areerat, S.
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surat.ar@kmitl.ac.th

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    Item type:Publication,
    The estimation of cell density in isotropic microcellular polymeric foams using the critical bubble lattice
    (2011-03-01)
    Buahom, Piyapong
    ;
    Areerat, Surat
    In this study, models for estimating the cell density of isotropic polymeric foams using the surface cell density were developed. The basic morphological unit cell for these models is a gas-filled pentagonal dodecahedral cell cavity. The critical bubble lattice model was introduced to associate the packing structure of the pentagonal dodecahedral cells with a face-centered cubic (FCC) packing structure, and the cell density was estimated. This model was then used to investigate the effect of nonperfect cell cross-sections as found in the micrographs of cell densities of foams. Two cases were examined: first, the ideal case of a perfect cross-section, and second, the actual case of a nonperfect cross-section. The plots of cell density versus surface cell density from recently published data show the effect of a nonperfect cross-section on the estimation of cell density within an FCC lattice with perfect and nonperfect cell cross-sections. The percentage average absolute deviation (AAD) showed that the nonperfect cell cross-sectional model reliably predicts the cell density of isotropic low-density foam with an AAD of 39.2%. The perfect cell cross-sectional model reliably predicts the cell density of isotropic high-density foam with an AAD of 57.2%. These new models are more reliable than the conventional model, which give AADs 59.4% for low-density foams and 62.4% for high-density foams. Furthermore, the isotropic foam index was introduced as a parameter to indicate the isotropic foam behavior. © The Author(s) 2010.