Journal
JOURNAL OF CO2 UTILIZATION
Volume 57, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2022.101887
Keywords
Thermoplastic polyurethane composite; Magnesium borate whisker; Foamability; Anti-shrinkage; Supercritical CO2 foam
Funding
- National Natural Science Foundation of China [21706063]
- Natural Science Foundation of Shanghai [20ZR1413700]
- Fundamental Research Funds for the Central Universities
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This study focuses on the preparation of eco-friendly thermoplastic polyurethane (TPU) foam using supercritical carbon dioxide (CO2) as a blowing agent. The addition of borate ester coupling agent (BE) modified magnesium borate whiskers (Mg2B2O5) (BE-Mg2B2O5) effectively modulates the cell nucleation, bubble growth, and foam stabilization of TPU. The intercalation structure of Mg2B2O5, entanglement effect of BE, and increased physical crosslinking density play vital roles in enhancing the properties of TPU composites.
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.
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