文献类型：期刊文献

英文题名：Supercritical CO2 foaming and shrinkage resistance of thermoplastic polyurethane/modified magnesium borate whisker composite

作者：Gao, Xiulu[1];Chen, Yichong[1];Chen, Peng[1];Xu, Zhimei[1];Zhao, Ling[1,2];Hu, Dongdong[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]Xinjiang Univ, Coll Chem Engn, Urumqi 830046, Peoples R China

年份：2022

卷号：57

外文期刊名：JOURNAL OF CO2 UTILIZATION

收录：;EI(收录号：20220311459736);WOS:【SCI-EXPANDED(收录号:WOS:000788080800033)】；

基金：National Natural Science Foundation of China (21706063), Natural Science Foundation of Shanghai (20ZR1413700), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Thermoplastic polyurethane composite; Magnesium borate whisker; Foamability; Anti-shrinkage; Supercritical CO2 foam

摘要：Thermoplastic polyurethane (TPU) foam is eco-friendly prepared with supercritical carbon dioxide (CO2) as a blowing agent. Magnesium borate whisker (Mg2B2O5) modified by borate ester coupling agent (BE) (BE-Mg2B2O5) was introduced into TPU to modulate cell nucleation, bubble growth and foam stabilization depending on the intercalation structure of Mg2B2O5, entanglement effect of BE and increased physical crosslinking density. The modulation of Mg2B2O5 on the hard segment crystallization promoted hard segment's (HS) microstructure, i. e., physical crosslinking density. The addition of BE-Mg2B2O5 enhanced the rheological properties, maximum tensile strength and elongation at break of TPU composites. Excellent mechanical property and strain-hardening behavior of TPU composites improved the foamability of TPU composites. Mg2B2O5 and entanglement points acted as heterogeneous nucleation sites to momentously increase cell density and reduce bubble size. Intercalation structure of Mg2B2O5, entanglement effect of BE and high physical crosslinking density effectively limited the TPU relaxation and memory recovery. BE-Mg2B2O5 around the cell wall acted as a barrier to slow down the diffusion rate of CO2 from inside the bubble to outside. The dual action synergistically reduced the shrinkage of TPU foam.