基于协同热可逆四氢键的高机械性能自修复聚氨酯弹性体,ACS Applied Polymer Materials

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基于协同热可逆四氢键的高机械性能自修复聚氨酯弹性体
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-01-11 , DOI: 10.1021/acsapm.2c01849
Yinghu Song ₁ , Jialiang Li ₁ , Guojun Song ₁ , Lina Zhang ₁ , Zhen Liu ₁ , Xianhui Jing ₁ , Fei Luo ₁ , Yingda Zhang ₁ , Yuhan Zhang ₁ , Xiaoru Li ₁

Affiliation

制备具有优异自修复能力的聚氨酯（PU）材料，同时提高其机械性能和高延展性，仍然具有挑战性和吸引力。在这里，通过将四重氢键和热可逆 Diels-Alder 键的交联网络和刚性环结构引入线性主链，成功制备了多功能线性 PU 超分子弹性体。结果表明，所得聚氨酯弹性体具有较高的拉伸强度（6.30 MPa）、伸长率（1957.84%）、韧性（84.48 MJ/m ³), 以及出色的修复效率 (93.33%)。5-(2-羟乙基)-6-甲基-2-氨基尿嘧啶的四重氢键和 4,4'-双马来酰亚胺二苯基甲烷与糠醇的共轭反应产生的热可逆 Diels-Alder 键，由于其协同双重可逆键，形成了具有优良机械性能、自愈性能、形状恢复性能和再加工性能的聚氨酯弹性体。制备的多功能PU可作为柔性导电材料的基材或与导电材料作为导电复合材料，表面破损时可多次自我修复，可循环利用，大大提高了材料的使用寿命。因此，所制备的多功能高性能自修复PU材料在多个领域具有潜在的应用前景。

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Self-Healing Polyurethane Elastomers with High Mechanical Properties Based on Synergistically Thermo-Reversible and Quadruple Hydrogen Bonds

It is still challenging and attractive to prepare polyurethane (PU) materials with excellent self-healing ability while improving their mechanical properties and high ductility. Here, a multifunctional linear PU supramolecular elastomer was successfully prepared by introducing a cross-linking network of quadruple hydrogen bonds and thermo-reversible Diels–Alder bonds and rigid ring structure to the linear backbone. The results exhibited that the obtained PU elastomer displayed a high tensile strength (6.30 MPa), elongation (1957.84%), toughness (84.48 MJ/m³), and excellent repair efficiency (93.33%). The quadruple hydrogen bonds from 5-(2-hydroxyethyl)-6-methyl-2-aminouracil and thermo-reversible Diels–Alder bonds from the conjugated reaction of 4,4′-bismaleimide diphenylmethane with furfuryl alcohol, due to its synergetic dual reversible bonds, formed the PU elastomer that possessed excellent mechanical, self-healing, shape recovery, and reprocessing properties. The prepared multifunctional PU can be used as a substrate for flexible conductive materials or as conductive composite material with conductive materials, which can self-repair many times when the surface is damaged, can be recycled, and greatly improve the service life of the material. Therefore, the prepared multifunctional high-performance self-healing PU materials have potential applications in several fields.

更新日期：2023-01-11

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