Foaming Behavior and Properties of Bimodal Cellular Polymer Based on Multi-step Pressure Control
DONG Guiwei1,2, ZHAO Guoqun1, DING Wangyang1, WANG Guilong1, ZHANG Lei1
1 Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education, Shandong University, Jinan 250061, China 2 State Key Laboratory of Polymer Materials Engineering,Sichuan University, Chengdu 610065, China
Abstract: Bimodal cellular polymer foam is a special structural material in polymer foam materials. It has been widely studied and concerned in recent years. In supercritical fluid assisted batch foaming process, the pressure control of foaming system is the key factor to induce the nucleation and growth of bimodal cellular foam. Based on this, a multi-step pressure control polymer batch foaming system was constructed. The polystyrene foam with typical bimodal foam structure was prepared. The effects of different first step pressure drop, holding time of first step pressure drop and second step pressure drop on the foaming behavior of the polymer, and the thermal insulation properties of the prepared material were studied. The results show that when the saturation temperature is above 90 ℃ and the first step pressure drop is 3 MPa and 8 MPa, a good bimo-dal cell structure can be formed. The increase of saturation temperature and holding time of first step pressure drop can promote the growth of big cells, but have no effect on the growth of small cells. The foamed polystyrene foam with bimodal cellular structure has good thermal insulation properties, and the thermal conductivity of the foamed material with a maximum foaming rate of 47.27 is only 72 mW/(m·K).
1 Notario B, Pinto J, Rodriguez-perez M. Polymer, 2015, 63, 116. 2 Chen Z, Zhang Z Z, Cong Z H, et al. Journal of Materials Engineering, 2020, 48(3), 1 (in Chinese). 陈振, 张增志, 丛中卉, 等. 材料工程, 2020, 48(3), 1. 3 Wu Z A, Zheng X P, Gong L W, et al. Materials Reports B:Research Papers, 2020, 34(4), 8200 (in Chinese). 吴志昂, 郑晓平, 龚莉雯, 等. 材料导报:研究篇, 2020, 34(4),8200. 4 Gong P J, Wang G L, Tran M P, et al. Carbon, 2017, 120, 1. 5 Liu W, Pang Y Y, Wu M H, et al. Chinese Polymer Bulletin, 2018(3), 12 (in Chinese). 刘伟, 庞永艳, 吴明辉, 等. 高分子通报, 2018(3),12. 6 Wang K, Pang Y Y, Wu F, et al. The Journal of Supercritical Fluids, 2016, 110, 65. 7 Zhang C L, Zhu B, Li D C, et al. Polymer, 2012,53, 2435. 8 Arora K A, Lesser A J, Mccarthy T J. Macromolecules, 1998, 31, 4614. 9 Bao J B, Liu T, Zhao L, et al. The Journal of Supercritical Fluids, 2011, 55, 1104. 10 Xu L Q, Huang H X. The Journal of Supercritical Fluids, 2016, 109, 177. 11 Jacobs L J M, Hurkens S A M, Kemmere M F, et al. Macromolecular Materials and Engineering, 2008, 293, 298. 12 Konigslow K V, Park C B, Thompson R B. Physical Review Applied, 2017, 8, 1. 13 Wang L, Hikima Y, Oshima M, et al. RSC Advances, 2018, 8, 15405. 14 Huang J N, Jing X, Geng L H, et al. The Journal of Supercritical Fluids, 2015, 103, 28. 15 Wang Z J, Qu Z J, Chen P, et al. China Plastics Industry, 2016, 44(10), 104 (in Chinese). 王占嘉, 屈中杰, 陈鹏, 等. 塑料工业, 2016, 44(10), 104. 16 Hou J J, Zhao G Q, Wang G L, et al. The Journal of Supercritical Fluids, 2019, 145, 140.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2022, Vol. 36 
