Preparation of Microcellular EPDM Foams by Supercritical CO2
WEN Huayin1, ZHANG Wenhuan2, HE Wan1, LIU Tao2, LUO Shikai1,2, ZHOU Yuanlin1
1 School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China; 2 Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China
Abstract: In this paper, supercritical CO2 is used as physical foaming agent to prepare microcellular EPDM foams by using the rapid pressure relief method. The effects of foaming conditions and vulcanization conditions on the structure of EPDM foam were systematically studied. Through a series of experiments, it is found that the vulcanization conditions determine the strength, cross-linking degree and elasticity of the EPDM matrix, which is the key factor for the formation of the cell structure of foam. The decrease of scCO2 saturation temperature is beneficial to the preparation of cells with smaller pore diameter. The increase of scCO2 saturation pressure significantly improves the regularity of the cell morphology and the uniformity of the cells and an increase in saturation pressure of scCO2 will result in an exponential increase in the density of the pores. The foam obtained in different vulcanization and foaming conditions have a minimum average pore diameter of 1.24 μm and a maximum pore density of 1.33×1011 cells/cm3.
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2021, Vol. 35 
