Preparation and Properties of Bio-Based Self-Healing and Recyclable Polyurethane Elastomer Based on Dynamic Iimine Bonds

被引：0
|
作者：
Pan Z. [1 ]
Zhao Q. [1 ]
Xue Y. [1 ]
Bo C. [1 ]
Zhang M. [1 ]
Zhou Y. [1 ]
机构：
[1] Institute of Chemical Industry of Forestry Products, Chinese Academy of Forestry, Nanjing
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2022年 / 38卷 / 12期
关键词：
bio-based; imine bond; polyurethane; recyclable; self-healing;
D O I：
10.16865/j.cnki.1000-7555.2022.0272
中图分类号：
学科分类号：
摘要：
The preparation of self-healing polyurethane materials from renewable resources can not only meet the needs of practical applications, but also match the green sustainable development strategies. Bio-based furandiamine was synthesized from furfurylamine, and further reacted with vanillin through Mannich reaction to obtain Schiff base containing dynamic imine bonds. The synthesized Schiff base was employed as chain extender and mixed with polyurethane prepolymers, a polyurethane with self-healing and recyclability was prepared. The mechanical properties and self-healing properties of polyurethane can be controlled by simply adjusting the ratio of soft and hard segment. The formation of Schiff bases was demonstrated by NMR and IR. Then, the self-healing and recyclable properties of the elastomers were systematically investigated by differential scanning calorimetry (DSC), polarized light resonance microscopy (POM) and tensile testing. When the mole ratio of hard segment, soft segment and chain extender is 3:1: 2, and the elastomer is heated at 80 °C for 2 h, the self-healing efficiency can reach 97.5%. At the same time, the existence of dynamic imine bonds enables the material to be recycled again at room temperature. All the results show that the above-mentioned polyurethane elastomers have excellent self-healing efficiency and recyclable properties, providing potential applications as promising bio-based Schiff bases in repairing the cracks quickly generated in composites that require recyclability as well as sustainability. © 2022 Chengdu University of Science and Technology. All rights reserved.
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页码：11 / 18
页数：7
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