Journal
JOURNAL OF CO2 UTILIZATION
Volume 62, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2022.102076
Keywords
TPEE; Microcellular foaming; Mixed blowing agents; Shrinkage behavior; Mechanical property
Funding
- National Natural Science Foundation of China (NSFC) [51875318, 52175341, 51905308, 51905307]
- Shandong Provincial Key Research and Development Pro-gram (Major Scientific and Technological Innovation Project) [2019JZZY020205]
- Postdoctoral Science Foundation of China [2019M662352]
- Opening Project of State Key Laboratory of Polymer Materials Engineering, Sichuan University [sklpme2021-05-01]
- State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology [P2020-012]
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A novel strategy of using mixed CO2 and N2 as blowing agents in microcellular foaming of TPEE was developed to stabilize cell structure. By adjusting the ratio of mixed blowing agents, TPEE foams with high expansion ratio and recovery ratio were fabricated, and the correlation between the mechanical properties and different shrinkage behaviors was investigated.
Thermoplastic polyester elastomer (TPEE) is a high-performance polymer with high tear strength and excellent abrasion resistance, and microcellular TPEE foams exhibit low density and special mechanical properties. Nevertheless, shrinkage behavior of the TPEE foam is still a critical challenge which greatly limits its industrial application, and further, the shrinkage mechanism is rarely figured out. Herein, a novel strategy of implementing mixed CO2 & N2 as blowing agents in microcellular foaming was developed to stabilize cell structure. Thanks to the modest permeability of mixed blowing agents, TPEE foams with high stable expansion ratio of higher than 17-fold and recovery ratio of up to 77 % were fabricated, and it found that the ratio of mixed blowing agents could modulate the shrinkage behavior of TPEE foams. Moreover, the correlation between the mechanical properties and TPEE foams with different shrinkage behaviors was investigated. For TPEE foams with similar stable expansion ratios, decreasing the shrinkage helped to increase the maximum compressive stress by 100 % and to reduce the energy loss coefficient by 43 %. Overall, the developed microcellular foaming prepared with the mixed CO2 & N2 as blowing agents shows great promise in fabricating advanced elastomer foams with high expansion ratio, stable cell morphology and outstanding mechanical properties.
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