Scratch-healing poly (methyl methacrylate)-co-[poly (methyl metharyleate)-graft-(oligo-caprolactone)] urethane networks containing a Diels Alder (DA) adduct unit (GCPNp-DAs) were successfully synthesized and shown to be capable of undergoing thermally reversible crosslinking. The synthesized polymers were coated on steel substrates to investigate the influence of their material properties on their scratch-healing performance. The reversible formation of crosslinked and de-crosslinked structures of the GCPNp-DAs at DA and retro-DA (rDA) reaction temperatures was demonstrated using FT-IR spectroscopy, differential scanning calorimetry (DSC), oscillatory rheology, and nanoindentation. The scratch-resistance and healing performances of the GCPNp-DA coatings were evaluated quantitatively using a scratch test machine equipped with an optical microscope (OM) and an atomic force microscope (AFM). These results were found to be greatly influenced by the material properties of the coatings such as the elastic modulus, indentation hardness (H_IT), crosslinking density (v_c), and thermal transition temperature as well as by whether the deforming load that produced the scratches was increased in a progressive (gradual) or step-wise manner.

从头开始愈合的聚（甲基丙烯酸甲酯）-co- [聚（甲基丙烯酸甲酯）-接枝包含Diels Alder（DA）加合物单元（GCPNp-DAs）的-（低聚己内酯）氨基甲酸酯网络已成功合成，并显示出能够进行热可逆交联。将合成的聚合物涂覆在钢基材上，以研究其材料性能对其划痕修复性能的影响。使用FT-IR光谱，差示扫描量热法（DSC），振荡流变学和纳米压痕证明了GCPNp-DA在DA和逆向DA（rDA）反应温度下可交联和去交联结构的可逆形成。使用配备有光学显微镜（OM）和原子力显微镜（AFM）的划痕试验机定量评估GCPNp-DA涂层的抗划伤性和修复性能。ħ _IT），交联密度（v _Ç），和热转变温度以及由所产生的划痕变形负载是否以渐进的（逐渐增加）或逐步的方式。