Synthesis and Compressive Response of Microcellular Foams Fabricated from Thermally Expandable Microspheres

作     者：Rui-Zhi Zhang Ju Chen Mao-Wei Huang Jian Zhang Guo-Qiang Luo Bao-Zhen Wang Mei-Juan Li Qiang Shen Lian-Meng Zhang Rui-Zhi Zhang;Ju Chen;Mao-Wei Huang;Jian Zhang;Guo-Qiang Luo;Bao-Zhen Wang;Mei-Juan Li;Qiang Shen;Lian-Meng Zhang

作者机构：State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology School of Civil and Hydraulic Engineering Hefei University of Technology School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学（英文版）)

年 卷 期：2019年第37卷第3期

页      面：279-288页

核心收录：

学科分类：07[理学] 0703[理学-化学] 

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51572208 and 51521001) the National Key R&D Program of China(No.2018YFB0905600) the 111 Project(No.B13035) the China Postdoctoral Science Foundation(No.2018M632935) the Nature Science Foundation of Hubei Province(No.2016CFA006) 

主　　题：Thermally expandable microspheres Compressive response Split Hopkinson bar(SHPB) Microcellular Failure mechanism 

摘      要：Cellular foams are widely applied as protective and energy absorption materials in both civil and military fields. A facile and simple one-step heating method to fabricate polymeric foams is measured by adopting thermally expandable microspheres(TEMs). The ideal foaming parameters for various density foams were determined. Moreover, a mechanical testing machine and split Hopkinson bar(SHPB) were utilized to explore the quasi-static and dynamic compressive properties. Results showed that the cell sizes of the as-prepared TEMs foams were in the micrometer range of 11 μm to 20 μm with a uniform cell size distribution. All the foams exhibited good compressive behavior under both quasi-static and high strain rate conditions, and were related to both foam densities and strain rates. The compressive strength of the TEMs foams at 8400s^(-1) was up to 4 times higher than that at 10^(-4)s^(-1). The effects exerted by the strain rate and sample density were evaluated by a power law equation. With increasing density, the strain rate effect was more prominent. At quasistatic strain rates below 3000s^(-1) regime, initial cell wall buckling and subsequent cellular structure flattening were the main failure mechanisms. However, in the high strain rate(HSR) regime(above 5000s^(-1)), the foams were split into pieces by the following transverse inertia force.