Photoacoustic characterization of the effects of air inclusion on the thermal properties of foamed polyurethane |
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| Authors: | N F Leite L C M Miranda |
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| Affiliation: | (1) Laboratório Associado de Sensores e Materiais, Instituto de Pesquisas Espaciais, Caixa Postal 515, 12201 São José dos Campos, S. P., Brazil;(2) Instituto Politécnico do Rio de Janeiro, Caixa Postal 97282, 28600 Nova Friburgo, R. J., Brazil;(3) Present address: Instituto de Pesquisas Espaciais, S.J. Campos, S.P., Brazil |
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| Abstract: | The usefulness of the open photoacoustic cell technique for investigating the effects of air inclusions on the thermal properties of foamed polyurethane is demonstrated. It is shown that the thermal diffusivity and thermal expansion coefficients increase with decreasing values of the resin to catalyst ratio, which corresponds to greater air inclusion in the resin. |
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