Highly Stretchable, Self-Healable, and Adhesive Polyurethane Elastomers Based on Boronic Ester Bonds,ACS Applied Polymer Materials

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Highly Stretchable, Self-Healable, and Adhesive Polyurethane Elastomers Based on Boronic Ester Bonds
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-11-20 , DOI: 10.1021/acsapm.0c00941
Yue Yang ₁ , Fu-Sheng Du ₁ , Zi-Chen Li ₁

Affiliation

Integrating stretchability, self-healability, and surface adhesive properties in a single material is attractive for expanding the applications in demanding fields. Herein, we have studied the metathesis kinetics of catechol-derived boronic esters and incorporated them into polyurethane (PU) networks to prepare a type of PU elastomeric vitrimers with excellent stretchability, healability, and adhesive properties. Two series of dynamic PU elastomers that have different cross-linking densities and varied fractions of catechol moieties were simply prepared by a solution casting method from the linear PUs containing pendent catechol groups and 1,4-phenylenediboronic acid. These elastomers possess excellent stretchability and moderate mechanical properties that can be readily manipulated by varying the cross-linking density and the number of residual catechol groups. Moreover, the elastomers are healable and reprocessable under mild conditions and show moderate adhesive capability. The effects of the cross-linking density and residual catechol fraction on the thermal relaxation profiles and adhesive strength of the elastomers were explored in detail. Finally, we have demonstrated the potential of this kind of dynamic PU elastomers for applications as stretchable, healable, and self-adhesive conducting composite materials.

中文翻译：

基于硼酸酯键的高拉伸性，自修复性和粘合性聚氨酯弹性体

在单一材料中集成可拉伸性，自修复性和表面粘合性能对于在苛刻领域中扩展应用具有吸引力。在本文中，我们研究了邻苯二酚衍生的硼酸酯的复分解动力学，并将其掺入聚氨酯（PU）网络中，以制备具有优异的拉伸性，修复性和粘合性的PU弹性体三聚体。简单地通过溶液浇铸法，由包含侧基邻苯二酚基团和1，4-苯二硼酸的线性PU通过溶液流延法制备具有不同交联密度和不同比例的邻苯二酚部分的两个系列动态PU弹性体。这些弹性体具有出色的拉伸性和适度的机械性能，可以通过改变交联密度和残留的邻苯二酚基团的数量来轻松地控制它们。此外，弹性体在温和条件下可修复和再加工，并显示适度的粘合能力。详细探讨了交联密度和残留邻苯二酚分数对弹性体的热松弛曲线和粘合强度的影响。最终，我们证明了这种动态PU弹性体在可拉伸，可修复和自粘导电复合材料中的应用潜力。详细探讨了交联密度和残留邻苯二酚分数对弹性体的热松弛曲线和粘合强度的影响。最终，我们证明了这种动态PU弹性体在可拉伸，可修复和自粘导电复合材料中的应用潜力。详细探讨了交联密度和残留邻苯二酚分数对弹性体的热松弛曲线和粘合强度的影响。最终，我们证明了这种动态PU弹性体在可拉伸，可修复和自粘导电复合材料中的应用潜力。

更新日期：2020-12-11

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