微胶囊型自修复环氧树脂材料的力学性能及修复效率

Mechanical properties and repair efficiency of self⁃repairing microencapsulated epoxy resin

为了探究自修复环氧树脂微胶囊的引入对树脂基复合材料的力学性能和修复性能的影响,将由原位聚合法制得的环氧树脂微胶囊和潜伏型固化剂邻苯二甲酸酐组成的修复体系加入到E51环氧树脂和固化剂改性聚醚胺中,通过实验研究了混合体系的剪切黏度,并进一步分析了材料的力学性能和修复效率。结果表明,复合材料的力学性能随着自修复组分含量的升高而降低,复合材料的修复效率随着自修复组分含量的升高与而升高,但修复后复合材料的抗拉强度并不是随着自修复组分含量的升高而递增的。综合分析实验结果得出的最优选择为自修复组分的比例为3/2,含量为8%(质量分数,下同),此时复合材料的抗拉强度为15.32 MPa,断裂修复后抗拉强度10.13 MPa,修复效率66.12%。

To investigate the effect of the introduction of self‐healing epoxy microcapsules on the mechanical properties and repairability of resin‐based composite materials,a repair system consisting of in‐situ polymerized epoxy microcapsules and phthalic anhydride as a latent curing agent was incorporated into the mixture of E51‐type epoxy resin and modified polyetheramine curing agent,resulting in the formation of self‐healing epoxy resin‐based composite materials.The shear viscosity of the mixing system was analyzed,and the mechanical and repairing performance of the composite materials were investigated.The results indicated that the increase of the content of self‐healing components resulted in a decrease in the mechanical properties of the composite materials but an increase in their healing efficiency.However,the tensile strength of the repaired composite materials did not show a linear increment.Through comprehensive analysis on the experimental results,the optimal choice was determined to be a self‐healing component ratio of 3/2 and a microcapsule content of 8 wt%for the composite materials.Under these conditions,the resultant composite material exhibited tensile strength of 15.32 MPa and post‐repair tensile strength of 10.13 MPa,presenting a healing efficiency of 66.12%.