Lollivier Guillaume, Gressier Marie, Ansart Florence, Aufray Maëlenn, Menu Marie-Joëlle
CIRIMAT, Université de Toulouse, UPS, 31062 Toulouse, France.
CIRIMAT, Université de Toulouse, INP-CNRS, ENSIACET, 31062 Toulouse, France.
Materials (Basel). 2021 Sep 17;14(18):5382. doi: 10.3390/ma14185382.
Self-healing polymers are a new class of material that has recently received a lot of attention because of the lifespan improvement it could bring to multiple applications. One of the major challenges is to obtain multifunctional materials which can self-heal and exhibit other interesting properties such as protection against corrosion. In this paper, the effect of the incorporation of an aminosilane on the properties of a self-healing organic polymer containing disulfide bond is studied on films and coatings for aluminium AA2024-T3 using simple one step in situ synthesis. Hybrid coatings with enhanced anticorrosion properties measured by EIS were obtained thanks to the formation of a protective oxide interface layer, while exhibiting wound closure after exposition at 75 °C. The thermal, mechanical and rheological properties of the films with different aminosilane amounts were characterized in order to understand the influence of the slight presence of the inorganic network. Stiffer and reprocessable hybrid films were obtained, capable to recover their mechanical properties after healing. The nanocomposite structure, confirmed by TEM, had a positive effect on the self-healing and stress relaxation properties. These results highlight the potential of sol-gel chemistry to obtain efficient anticorrosion and self-healing coatings.
自修复聚合物是一类新型材料，由于其能延长多种应用的使用寿命，近年来受到了广泛关注。其中一个主要挑战是获得既能自修复又能展现出其他有趣特性（如防腐蚀）的多功能材料。本文采用简单的一步原位合成法，研究了氨基硅烷的掺入对含二硫键的自修复有机聚合物在AA2024-T3铝合金薄膜和涂层性能的影响。通过电化学阻抗谱（EIS）测量发现，由于形成了保护性氧化界面层，获得了具有增强防腐性能的混合涂层，同时在75℃暴露后涂层能实现伤口闭合。对含有不同量氨基硅烷的薄膜的热性能、力学性能和流变性能进行了表征，以了解无机网络的少量存在所产生的影响。获得了更硬且可再加工的混合薄膜，其在愈合后能够恢复力学性能。经透射电子显微镜（TEM）证实的纳米复合结构对自修复和应力松弛性能有积极影响。这些结果突出了溶胶-凝胶化学在获得高效防腐和自修复涂层方面的潜力。
