A highly efficient bionic self-healing flexible waterborne polyurethane elastic film based on a cyclodextrin–ferrocene host–guest interaction,Polymer Chemistry

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A highly efficient bionic self-healing flexible waterborne polyurethane elastic film based on a cyclodextrin–ferrocene host–guest interaction
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020-12-29 , DOI: 10.1039/d0py01480j
Ending Zhang _{1,

2,

3,

4,

5} , Jun Shi _{1,

2,

3,

4,

5} , Luqi Xiao _{1,

2,

3,

4,

5} , Qiang Zhang _{1,

2,

3,

4,

5} , Maoping Lu _{1,

2,

3,

4,

5} , Bingfei Nan _{1,

2,

3,

4,

5} , Kun Wu _{1,

2,

3,

4,

5} , Mangeng Lu _{1,

2,

3,

4,

5}

Affiliation

The preparation of flexible elastomer materials with favorable mechanical properties and bionic self-healing abilities is still a current challenge. Herein, a novel ferrocene-diol (Fc-diol) was synthesized and incorporated into waterborne polyurethane (WPU) chains with methylated β-cyclodextrin (Me-β-CD). A series of waterborne polyurethane chains with different loading molar ratios of ferrocene (Fc) to cyclodextrin (CD) were fabricated successfully. Repair experiments showed that the best self-healing effect of WPU-Fc/CD was obtained when the molar ratio of Fc to CD was 2 : 1, as it showed an almost 100% repair effect for scratches and a high healing efficiency (98.54%) for completely broken wounds. UV titration, VT-FTIR and ¹H–¹H NOESY NMR spectroscopy results demonstrated that a synergic effect between the host–guest interactions and hydrogen bonds enabled them to be constructed successfully. Therefore, the scratches of the WPU-Fc/CD film could be repaired effectively based on this synergic effect. Furthermore, the film also exhibited ∼10.85 MPa of tensile strength and an elongation of 470.85%. WPU-Fc/CD hybrid films that are silver loaded can be employed as flexible conductive films for circuits, and the results indicated that they have great potential applications in electronic skins, flexible sensors, bionic devices, etc.

中文翻译：

基于环糊精-二茂铁主体-客体相互作用的高效仿生自修复柔性水性聚氨酯弹性膜

具有良好的机械性能和仿生自修复能力的柔性弹性体材料的制备仍然是当前的挑战。本文中，合成了新型二茂铁-二醇（Fc-二醇），并将其与甲基化的β-环糊精（Me-β-CD）掺入水性聚氨酯（WPU）链中。成功制备了一系列二茂铁（Fc）与环糊精（CD）的负载摩尔比不同的水性聚氨酯链。修复实验表明，当Fc与CD的摩尔比为2：1时，WPU-Fc / CD具有最佳的自愈效果，因为它显示出几乎100％的划痕修复效果和较高的治愈率（98.54％），以彻底打破伤口。紫外线滴定，VT-FTIR和¹ H – ¹H NOESY NMR光谱结果表明，宿主-客体相互作用与氢键之间的协同作用使它们得以成功构建。因此，基于该协同作用，可以有效地修复WPU-Fc / CD膜的划痕。此外，该膜还显示出〜10.85MPa的拉伸强度和470.85％的伸长率。银载WPU-Fc / CD杂化膜可用作电路的柔性导电膜，结果表明它们在电子皮肤，柔性传感器，仿生器件等方面具有巨大的应用潜力。

更新日期：2021-01-15

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