Morphological evaluation of ultra low-density poly (methyl methacrylate) microcellular plastic developed through cyclic foaming technique
by G. Radhakrishna; Rupesh Dugad; Abhishek Gandhi; Smita Mohanty; S.K. Nayak
International Journal of Materials Engineering Innovation (IJMATEI), Vol. 10, No. 4, 2019

Abstract: In this article, the cyclic microcellular foaming technique has been employed to develop low-density poly (methyl methacrylate) (PMMA) Microcellular foamed composite material. Influence of saturation pressures both at the first as well as at second saturation stage were evaluated for its effect on the morphological attributes as well as on the foam density in the eventual microcellular foamed composites. Further, the cell collapse phenomenon which can be predominant in many conditions were analysed in depth by utilising scanning electron micrographs. With the increase in the saturation pressures at stage 1 of sorption, it was found to reduce the foam density considerably, however, in the second stage, the sorption property got significantly reduced and the overall expansion ratio was also reported to reduce. The average cell size is approximately 150 µm, and the cell size is ranging from 6 µm to 375 µm at various foaming conditions. This study puts forward a new technique to manufacture low-density PMMA microcellular foams and further provide information on steps to control the microstructure by controlling the foaming parameters.

Online publication date: Wed, 13-Nov-2019

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