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Abstract
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In this work, the poly styrene-co-acrylonitrile (SAN) beads and three blowing agents (CO2, N2, and n-pentane)
were used to investigate the foaming process via our batch foaming system. The solubility and diffusivity of three
blowing agents were determined by the MSB. The solubility of blowing agents was increased by pressure and decreased
by temperature increment. It has resulted in higher solubility and diffusivity data for SAN/n-pentane/CO2 system (Using
co-blowing gent) than other samples. According to the scanning electron microscopy (SEM) results, it was concluded
that the cell and foam densities were decreased with temperature increment and increased by pressure release rate
in all foamed beads. With using co blowing agents, higher pressure release rate, and low temperature without adding
any fillers, we could improve the foam characteristics and produce the SAN foams with smaller cell sizes and greater
cell and foam densities.
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