| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Effects of Foaming Process and Supercritical Carbon Dioxide Induced Crystallization on Foaming Behavior of Polycarbonate |
| WU Zhi’ang, ZHENG Xiaoping, GONG Liwen, WANG Fan, YANG Zicheng, ZHANG Li, BAO Jinbiao
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| School of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China |
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Abstract In this work, polycarbonate (PC) microcellular foams were prepared by supercritical carbon dioxide (scCO2) foaming technology. The effects of saturation temperature, saturation pressure, saturation time as well as polycarbonate crystallization induced by scCO2 on foaming beha-vior were systematically studied. PC foams with various expansion ratio were prepared by tuning foaming parameters, and the cell structures were observed by SEM. It was found that not only the foaming parameters of foaming temperature, scCO2 pressure but also scCO2 saturation time affec-ted PC foaming behavior. Moreover, scCO2 saturation time is the main influencing factor to PC foaming behavior. The crystallization behavior of foams was investigated by wide-angle X-ray diffraction. It was indicated that polycarbonate crystallization could be induced at a certain temperature and pressure, and the crystallinity increased with saturation time increasing, which restricts the cell growth. Therefore, a uniform cell structure of PC foams could be obtained at a certain temperature, pressure and saturation time.
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Published: 25 April 2020
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| Fund:This work was financially supported by the Natural Science Foundation of Ningbo City ( 2017A61005), and K.C. Wong Magna Fund in Ningbo University. |
About author:: Zhiang Wureceived his B.E. degree in June 2017 from Ningbo University in materials science and engineering. From September 2017 to June 2020, he educated and learned at the School of Material Science and Chemical Engineering, Ningbo University, focusing on the research of polymer materials processing.
Jinbiao Baoreceived his Ph.D. degree in University of Lorraine in France in 2012. He is currently an associate professor in Ningbo University. His research inte-rests are polymer materials processing, green preparation and application of polymer microporous materials. |
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2020, Vol. 34 
