形状记忆环氧树脂自修复涂层制备及性能研究

Preparation and Characterization of Shape Memory Epoxy Resin with Self-Healing Performance

以E51环氧树脂为成膜物质,通过调整聚醚胺固化剂的比例和聚四亚甲基醚二醇增韧剂的比例,采用浇筑法制得条状样品,测试其形状回复率、回复时间和拉伸曲线,研究原料用量对环氧树脂涂层形状记忆能力和韧性的影响,从而得出具有最佳形状记忆效应的配比。实验结果表明:当环氧树脂固化程度为70%时,形状回复率最好,回复时间最短。以此配比为基础制备了环氧树脂涂层,研究了其电化学性能。当涂层表面划痕在120℃加热30 min后,划痕尺寸减小,涂层自腐蚀电位升高,涂层具有较好的自修复效果。

Different samples are prepared via molding method using epoxy E-51 as filmforming binder and adjusting the ratio of the curing agent polyether amine and thickening agent PTMEG. The shape-recovering rate, shape-recovering time and the tensile elongation of the samples are tested. The effect of raw materials formula on the shape memory and flexibility of the epoxy coating is examined to obtain the optimal formula. The result shows that the recovering rate and recovering time are the best when the curing degree of epoxy resin is 70%, wherein, the electrochemical performance of the epoxy coating is investigated. It is revealed that the size of the scratch on the coating gets smaller after heating for 30 minutes at 120 ℃, meanwhile, the corrosion potential rises, indicating a good self-healing performance.