POLYMERS AND POLYMER MATRIX COMPOSITES |
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Preparation of Microcellular EPDM Foams by Supercritical CO2 |
WEN Huayin1, ZHANG Wenhuan2, HE Wan1, LIU Tao2, LUO Shikai1,2, ZHOU Yuanlin1
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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 |
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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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Published: 28 January 2021
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Fund:The Natural Science Foundation of China (51773186). |
About author:: Huayin Wen, graduate student from School of Material Science and Engineering, Southwest University of Science and Technology. From July 2019 to June 2021, he co-trained at the Institute of Chemical Mate-rials, China Academy of Engineering Physics, mainly engaged in the research of polymer foams such as rubber and plastic. Tao Liu, associate researcher, worked at the Institute of Chemical Materials, China Academy of Engineering Physics, and graduated from Sichuan University with a doctorate degree. He joined the China Academy of Engineering Physics in 2005. His major research covers the supercritical fluid foaming, engineering plastics, and silicone rubber. |
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1 Young W C, Sun K K, Shin C K, et al. Korean Journal of Chemical Engineering, 2011, 28(8), 1779. 2 Meng Q, Wu D. Physics Letters A, 2004, 327(1), 61. 3 Song L, Lu A, Feng P, et al. Materials Letters, 2014, 121, 126. 4 Kong W L, Bao J B, Wang J, et al. Polymer, 2016, 90, 331. 5 Lee K, Chang Y W, Kim S W. Journal of Applied Polymer Science, 2014, 131(11), 40307. 6 Colton J S, Suh N P. Polymer Engineering and Science, 1987, 27(7), 485. 7 Duin M V, Orza R, Peters R, et al. Macromolecular Symposia, 2010, 291(1), 66. 8 Yang Q, Yu H, Song L, et al. Journal of Applied Polymer Science, 2017, 134(20), 44807. 9 Shi X, Zhang G, Liu Y, et al. Polymers for Advanced Technologies, 2016, 27(4), 550. 10 Wang B Q, Peng Z L, Zhang Y. Plastics Rubber and Composites, 2006, 35(9), 360. 11 Wang C S. Journal of Applied Polymer Science, 1982, 27(4), 1205. 12 Li Z, Huang Y, Wang X, et al. Materials Letters, 2017, 201, 125. 13 Martin G, Barres C, Sonntag P, et al. European Polymer Journal, 2009, 45(11), 3257. 14 Wang H, Zhao S G, Wrana C. Journal of Macromolecular Science:Part B, 2017, 56(1), 39. 15 Li M, Cao X, Luo Y. Iranian Polymer Journal, 2014, 23(10), 775. |
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