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Preparation of living and highly stable blended polyurethane emulsions for self-healing films with enhancive toughness and recyclability
Polymer ( IF 4.1 ) Pub Date : 2019-12-31 , DOI: 10.1016/j.polymer.2019.122142
Yuanlai Fang , Xiaosheng Du , Xu Cheng , Mi Zhou , Zongliang Du , Haibo Wang

Widely applied waterborne polyurethane (WPUs) are expected to be functionalized with excellent mechanical property, ideal self-healing performance and desired recyclability, but it is a great challenge to integrate these attractive properties into a one pot WPU platform. Herein, a novel double ingredients waterborne polyurethane (2K-WPU-DA-x), found on the furan modified WPU-F and maleimide decorated WPU-M dispersions for Diels-Alder (DA) cross-linking reactions, was designed and projected which exhibited interesting enhanced-mechanical, self-healable and recyclable properties. The stability and appearance of these novel waterborne polyurethane emulsions were well studied. In the following, the reversible nature of direct DA/retro-DA reactions within the 2K-WPU-DA-x was extensively analyzed via FT-IR, UV–vis, and DSC measurements. On account of the DA bonds resulted cross-linked structure of 2K-WPU-DA-1/1, the stress and strain at the break increased by more than 20 MPa and 250% respectively compared with linear structural WPU-F. At the same time, relying on the thermal-responsive dissociation/reassociation of DA covalent bonds, 2K-WPU-DA-x films shown outstanding self-healing ability, with a self-healing efficiency beyond 95%. Moreover, owing to the reversibility of 2K-WPU-DA-x, the networks exhibited readily recyclable and reshaping properties, showing a desired thermoplasticity.



中文翻译:

制备具有高韧性和可回收性的活性高稳定性共混聚氨酯乳液用于自修复膜

广泛应用的水性聚氨酯(WPU)有望以优异的机械性能,理想的自修复性能和所需的可回收性进行功能化,但是将这些吸引人的性能集成到一锅式WPU平台中是一个巨大的挑战。本文设计并预测了在呋喃改性的WPU-F和马来酰亚胺装饰的WPU-M分散体中用于Diels-Alder(DA)交联反应的新型双组分水性聚氨酯(2K-WPU-DA-x),表现出有趣的增强机械性能,自修复和可回收特性。这些新型水性聚氨酯乳液的稳定性和外观得到了很好的研究。在下文中,直接DA /复古的可逆性通过FT-IR,UV-vis和DSC测量,对2K-WPU-DA-x中的-DA反应进行了广泛分析。由于DA键导致2K-WPU-DA-1 / 1的交联结构,与线性结构的WPU-F相比,断裂时的应力和应变分别增加了20 MPa和250%以上。同时,依靠DA共价键的热响应解离/再结合,2K-WPU-DA-x膜表现出出色的自我修复能力,自我修复效率超过95%。此外,由于2K-WPU-DA-x的可逆性,这些网络表现出易于回收利用和重塑的特性,显示出所需的热塑性。

更新日期:2019-12-31
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