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Thermally Reversible Crosslinked Polyurethanes Based on Blocking and Deblocking Reaction
Author(s) -
Han Feilong,
Xu Bowen,
Shah Sayyed Asim Ali,
Zhang Junying,
Cheng Jue
Publication year - 2020
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201900782
Subject(s) - materials science , ultimate tensile strength , polyurethane , self healing , fourier transform infrared spectroscopy , composite material , elongation , dissolution , swelling , thermal stability , chemical engineering , medicine , alternative medicine , pathology , engineering
New self‐healing crosslinked bisphenol‐S polyurethane (BPS/PU) including thermal reversible urethane bonds is prepared to balance the mechanical and self‐healing properties. BPS/PU is synthesized with BPS as chain extender to improve the mechanical property in the effect of high molecular regularity of BPS and extra stronger physical crosslinking in BPS/PU. The crosslinked structure of BPS/PU is confirmed by Fourier transform infrared spectra and swelling‐dissolution test. BPS/PU demonstrates great thermal reversability after three heating and cooling cycles and exhibits shorter relaxation time (3.3 min). The tensile strength and the tensile elongation of BPS/PU are up to 14.54 MPa and 877.12%, respectively, which are much higher than the value reported in literature. The qualitative self‐healing analysis of BPS/PU confirms that the cracks can be healed largely after healing progress, and the quantitative self‐healing analysis exhibits great healing properties with the healing efficiency of up to 77.92%.