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High strength, self-healing polyurethane elastomer based on synergistic multiple dynamic interactions in multiphase
Polymer ( IF 4.6 ) Pub Date : 2022-11-11 , DOI: 10.1016/j.polymer.2022.125513
Dan Liu, Cheng-Jie Fan, Yi Xiao, Ke-Ke Yang, Yu-Zhong Wang

Inspired by some biological phenomena, self-healing materials has been made great progress over the past decades. However, it is challenging to establish an adaptable strategy to achieve a good tradeoff between mechanical strength and self-healing ability. Herein, we reported a self-healing polyurethane elastomer (PPG-UPy-SS) with desirable mechanical performance and wonderful self-healing capacity via incorporating synergistic multiple dynamic interactions in multiphase. The 2-amino-5-(2-hydroxyethyl)-6-methylpyrimidin-4-ol (UPy) motif was introduced into the PPG segment to keep the mechanical performance profiting from the regular arrangement of hydrogen-bonding array and microphase separation benefited from π-π stacking of UPy dimers. 4-aminophenyl disulfide (APDS) was embedded into the loosely stacked amorphous region to increase the mobility of the chain segment to improve self-healing performance. The optimized sample PPG-UPy50%-SS50% possesses high tensile strength and fracture toughness of 18.2 MPa and 57.3 MJ m−3, and satisfactory self-healing efficiency of 99% and 96% (10 h at 80 °C), respectively.



中文翻译:

基于多相协同多重动态相互作用的高强度自修复聚氨酯弹性体

受一些生物现象的启发,自修复材料在过去几十年取得了长足的进步。然而,建立一种适应性策略以在机械强度和自愈能力之间取得良好的权衡是一项挑战。在此,我们报道了一种自修复聚氨酯弹性体 (PPG-UPy-SS),通过在多相中结合协同多重动态相互作用,具有理想的机械性能和出色的自修复能力。将 2-amino-5-(2-hydroxyethyl)-6-methylpyrimidin-4-ol (UPy) motif 引入 PPG 段以保持机械性能受益于氢键阵列的规则排列和微相分离受益于UPy 二聚体的 π-π 堆叠。将 4-氨基苯基二硫化物 (APDS) 嵌入到松散堆叠的无定形区域中,以增加链段的流动性,从而提高自愈性能。优化样品 PPG-UPy50% -SS 50%具有 18.2 MPa 和 57.3 MJ m -3的高拉伸强度和断裂韧性,以及令人满意的自愈效率分别为 99% 和 96%(80 °C 下 10 小时)。

更新日期:2022-11-11
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