Thermally Reversible Crosslinked Polyurethanes Based on Blocking and Deblocking Reaction,Macromolecular Materials and Engineering

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Thermally Reversible Crosslinked Polyurethanes Based on Blocking and Deblocking Reaction
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-03-20 , DOI: 10.1002/mame.201900782
Feilong Han ₁ , Bowen Xu ₁ , Sayyed Asim Ali Shah ₁ , Junying Zhang ₁ , Jue Cheng ₁

Affiliation

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%.

中文翻译：

基于封端和解封反应的热可逆交联聚氨酯

包括热可逆氨基甲酸酯键在内的新型自修复交联双酚S聚氨酯（BPS / PU）可以平衡机械和自修复性能。BPS / PU以BPS为扩链剂合成，以改善BPS的高分子规则性和BPS / PU中更强的物理交联效果的机械性能。BPS / PU的交联结构通过傅立叶变换红外光谱和溶胀溶解测试得到证实。在三个加热和冷却循环后，BPS / PU表现出出色的热可逆性，并且松弛时间更短（3.3分钟）。BPS / PU的拉伸强度和拉伸伸长率分别高达14.54 MPa和877.12％，远高于文献报道的值。

更新日期：2020-03-20

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