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The batch gas dissolution foaming method has been intensively used for the foaming of amorphous polymers but is not common in the case of semi-crystalline ones, moreover when a nanometer-sized inorganic phase is present in the polymer as in this case. In one step prior to the foaming the solubility and diffusivity of CO2 have been studied in these samples. The presence of nanoclays increases the gas solubility and slightly reduces the diffusivity. The presence of interfaces polymer-nanoclays justifies these results. In these sub-critical foaming conditions expansion ratios up to 2 with cell sizes of the order of 80 μm were obtained. Finally an interesting nucleation effect of the nanoclays was also observed.

Polyolefin based cellular materials: development of new production routes and optimization of barrier and mechanical properties by the addition of nanoclays