Solvent-free thermo-reversible and self-healable crosslinked polyurethane with dynamic covalent networks based on phenol-carbamate bonds

Solvent-free thermo-reversible and self-healable crosslinked polyurethane with dynamic covalent networks based on phenol-carbamate bonds
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具有基于苯酚-氨基甲酸酯键的动态共价网络的无溶剂热可逆和自修复交联聚氨酯

DOI:
10.1016/j.polymer.2019.121788
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发表时间:
2019-10
期刊:
影响因子:
4.6
通讯作者:
Xu Jun
Xu Jun
中科院分区:
化学2区
文献类型:
--
作者:
Shi Jiaxin;Zheng Tianze;Guo Baohua;Xu Jun

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具有动态共价网络的聚酰亚胺具有自修复、再加工和循环利用的潜力,然而,如何提高自修复和再加工的效率,减少溶剂的使用和成本,仍然是需要解决的问题。在这项工作中,我们合成了一个交联聚氨酯含有动态苯酚-氨基甲酸酯键从低成本的原料,而不使用溶剂。动态聚氨酯具有优异的自愈合和再加工性能,其表现出低松弛活化能(92.7 kJ/mol),并且在80 °C下保持2 h几乎可以完全愈合。经过4次重塑后,材料的力学性能几乎没有变化。对苯酚-氨基甲酸酯键的进一步研究给出了定量的反应平衡常数、热力学参数和离解活化能。鉴于苯酚氨基甲酸酯的动力学性质和易于合成,可以进一步定制设计各种类型的含有这种动态键的交联聚合物。
Polyurethanes with dynamic covalent networks have the potential of self-healing, reprocessing and recycling, however, how to improve the efficiency of self-healing and reprocessing, and reduce the use of solvent and costs, are still problems to solve. In this work, we synthesized a cross-linked polyurethane containing dynamic phenol-carbamate bonds from low-cost raw materials without use of solvent. The dynamic polyurethane possesses excellent self-healing and reprocessing properties, which exhibits low relaxation activation energy (92.7 kJ/mol) and can be almost completely healed at 80 °C for 2 h. After remolded for 4 times, the material shows almost little change in mechanical properties. Further studies on the phenol-carbamate bonds give the quantitative reaction equilibrium constants, thermodynamic parameters and dissociation activation energy. In viewpoint of the dynamic properties and easy synthesis of phenol-carbamates, various types of cross-linked polymers containing such dynamic bonds can be further tailor designed.
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