Abstract
A new kind of polyurethane was synthesized using 2,4-toluene diisocyanate (TDI) as the hard segment and polyether polyols as the soft segment. The influence of hard segment content on the self-healing ability of polyurethane was investigated by testing tensile strength and elongation healing rates after contact together for one week. Tensile test results indicate that the intrinsic healing capability of the polyurethane at room temperature decreased with an increasing hard segment content, and was lost when it reached fifty percent. Fracture morphologies of polyurethane were observed by confocal laser scanning microscopy, showing that roughness increased with an increasing hard segment content due to increased cross-link density and restraining of segment motion. The self-healing capability of this TDI polyurethane can be attributed to reversible H-bonds and to the mobility of the soft segment at room temperature. Segment mobility is a prerequisite of being able to self-heal.
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Acknowledgments
This research is supported by The National Science Foundation of China (51179018), The Application Basic Research Fund of the Ministry of Transport (2013329225330), The Fundamental Research Funds for the Central Universities and the outstanding scientific innovation team plan of Dalian Maritime University (3132014323). The authors gratefully acknowledge these entities for their financial support.
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Zhang, Y., Qi, Yh. & Zhang, Zp. The influence of 2,4-toluene diisocyanate content on the intrinsic self-healing performance of polyurethane at room-temperature. J Polym Res 22, 94 (2015). https://doi.org/10.1007/s10965-015-0744-0
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DOI: https://doi.org/10.1007/s10965-015-0744-0