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- W2315121159 abstract "This paper elucidates the effects of nucleating agents on the foaming behavior of polypropylene (PP) foams blown with butane in extrusion. The cell density was controlled by varying the talc content, and foam expansion was observed at a fixed blowing-agent content while varying the melt and die temperatures. As observed in our previous studies, the curve of the final expansion ratio of PP foam versus temperature showed a typical mountain shape for each talc content, indicating the two governing expansion mechanisms which are gas loss and stiffening of melt. As the talc content increased, the expansion curve skewed towards the lower temperature, which showed that the expanded foams of high talc content were more susceptible to gas loss. In order to analyze this change, the early-stage expansion behavior of extruded PP foams was investigated using a CCD camera. The expansion-profile images captured at the die exit show that the expansion rate of extruded foams was observed to be faster with a higher talc content because of the reduced diffusion distance of gas molecules to the nearest stabilized cell. The higher growth rate promoted the formation of an initial hump in the expansion profile which is known to be detrimental to large expansion. In order to decrease the expansion rate and thereby remove the initial hump, the temperature had to be further decreased, and consequently, the optimum temperature to maximize expansion decreased at a higher talc content. On the other hand, the increased cell density with a high talc content increased the number of cell layers in the cross section of the extruded foam, and consequently the gas loss was localized to the cells on the surface which acted favorably for the final expansion ratio to a certain degree." @default.
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- W2315121159 date "2006-08-01" @default.
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- W2315121159 title "A Study on the Foaming Behaviors of PP Resins with Talc as Nucleating Agent" @default.
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- W2315121159 doi "https://doi.org/10.1515/polyeng.2006.26.6.565" @default.
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