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Rheological properties of injection molded LDPE and mPE foams.

By Carreau, Pierre J.; Chen, Xue; Heuzey, Marie-Claude
Publication: Polymer Engineering and Science
Date: Monday, November 1 2004

The rheological properties of molten LDPE and mPE foams have been measured for small-amplitude oscillatory shear flow. The foam samples were prepared by injection molding, and the effect of injection conditions on the resultant cell structure is discussed. In all cases cellular foams with closed cells were obtained with cell densities in the range of 4 X [10.sup.5] - 7 X [10.sup.6] cells/[cm.sup.3] and cell diameters in the range of 30-110 [micro]m. The viscoelastic behavior of the foams is shown to be well described by the emulsion model proposed by Palierne (1) without using any fitting

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