本征型自修复高分子材料的分子结构与化学机制.docVIP

 本征型自修复高分子材料的分子结构与化 学机制# 5 10 15 20 25 30  摘要：本征型自修复方法是利用聚合物断裂面自身的物理或化学相互作用，愈合材料内部的 微裂纹损伤，无需额外的催化剂、修复剂，并且赋予材料反复自修复的的能力，其中在外界 刺激（光、热等）下发生可逆的化学反应，被证明是一种有效和实用的途径。本课题组设计、 合成了一系列新型本征型自修复高分子材料，包括热可逆和光可逆材料，深入研究了相关的 材料的最佳合成条件、可逆性能、自修复机理等。研究结果表明，所制备的热可逆自修复材 料具有良好的修复性能，并且在热可逆修复过程中可以保持材料的形状和承载能力，而光可 逆自修复材料具有多次修复能力和较高的修复效率。 关键词：本征型自修复；热可逆；光可逆；DA 键；烷氧胺基团 中图分类号：O631.1+1 Molecular structure and repairing mechanisms of intrinsic self-healing polymers RONG Minzhi, ZHANG Mingqiu (Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, GuangZhou 510275) Abstract: The intrinsic healing approaches rely on the inherent physical and/or chemical interactions of macromolecules between the broken faces to repair the micro-cracks inside the materials, which do not require additional healing agents and catalysts, and afford repeated healing cycles. Under stimulus of heat or light, reversible chemical reactions of covalent bonding, for example, proved to be an effective means in this aspect owing to their practicability. Several intrinsic self-healing polymers based on thermally or optically reversible units were studied in details, including optimal synthetic conditions, reversible features, and healing mechanisms. Satisfied healing effects were shown for all the systems, and the shape and load bearing ability remain nearly unchanged during thermal reversible mending processes, while repeated and higher healing efficiencies were obtained for photo-stimulated materials. Keywords: Intrinsic self-healing; thermal reversible; optically reversible; DA bonds; alkoxyamines 35 40  0 引言 聚合物及其复合材料具有轻质高强、耐腐蚀性和良好绝缘性能等特点，广泛地应用于各 个领域中。在其加工和使用过程中，不可避免会产生微裂纹和局部损伤，导致材料性能下降 并缩短使用期限。受生物体自愈合的启发，聚合物及其复合材料自修复的研究应运而生。自 修复材料在受到损伤时能够以类似动物和植物受伤愈合的方式来进行自修复，并且还能为材 料提供额外的安全性，提高其使用寿命，减少材料受到的破坏和降低材料生命周期成本[1,2]。 过去十年来自修复材料一直处于多样化的发展状态，种类繁多的外植型自修复材料和一些本 征型自修复材料正处于不断发展之中。 对于外植型自修复体系，存在着修复剂耗尽而无法多次修复的问题，而本征型自修复体 -1-