基于呋喃、马来酰亚胺Diels-Alder反应的自修复水性聚丙烯酸酯涂料的制备及性能研究  

Preparation and characterization of self-healing waterborne polyacrylate coating based on Diels-Alder reaction of furan and maleimide

作　　者：周冶锡 龚林波[1] 龚淑玲[1] ZHOU Yexi;GONG Linbo;GONG Shuling(College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,Hubei,China)

机构地区：[1]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《陕西师范大学学报（自然科学版）》2023年第3期109-116,共8页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家自然科学基金(51873164)。

摘　　要：基于呋喃和马来酰亚胺之间的可逆Diels-Alder(DA)反应,成功制得一种通过热驱动而具备自修复特性的水性聚丙烯酸酯涂料,并对自修复的条件进行了探索和优化。首先合成带呋喃官能团的丙烯酸酯单体(FEEMA),将其与常用的丙烯酸单体无皂乳液共聚合,得到稳定的水性丙烯酸酯乳液,并对其进行红外光谱、凝胶渗透色谱和粒径测试。其次设计合成出能够水分散的、带聚醚链的双马来酰亚胺(D-400-BMI),使其与水性丙烯酸酯乳液进行Diels-Alder反应得到水性聚丙烯酸酯交联膜。利用红外光谱及差示扫描量热法跟踪不同条件下的Diels-Alder反应和retro-DA过程,结果表明当聚合物中的FEEMA质量分数为30%、甲基丙烯酸甲酯与丙烯酸丁酯质量比为1∶5时,由自制的较软链段分子D-400-BMI制备的交联膜有较好的修复性能。交联膜被划伤后,经140℃热处理再缓慢冷却至室温,可对表面划伤和摩擦痕迹有良好的修复效果。此外,制备的交联膜还具备良好的耐热性能和机械性能,在表面涂层划痕和微裂纹自修复方面有潜在应用前景。Based on the reversible Diels-Alder reaction between furan and maleimide,a water-borne polyacrylate coating with self-healing properties driven by heat was successfully prepared,and the self-healing conditions were explored and optimized.A novel acrylate monomer with furan functional group(FEEMA)was synthesized.Stable acrylate emulsion was obtained by soap-free emulsion copolymerization.The results were verified by infrared spectroscopy,gel permeation chromatography(GPC)and particle size analysis(DLS).Then,polyether chain(D-400-BMI)was designed and synthesized,which could be dispersed in water.The crosslinked films were prepared by Diels-Alder reaction with water-based acrylate emulsion.The process of Diels-Alder and retro-DA reactions under different conditions were followed by infrared spectroscopy and differential scanning calorimetry.The results showed that the crosslinked membranes prepared by D-400-BMI had better repair performance when the content of FEEMA was 30%and the mass ratio of MMA and BA was 1/5.After the crosslinked membrane was scratched,the surface of the scratch and friction traces showed a good repair effect by heating for 140℃and then slowly cooling to room temperature.The crosslinked membrane also has good heat resistance and mechanical properties,so it has potential application prospect in the self repair of scratch and microcrack of surface coatings.

关 键 词：水性聚丙烯酸酯 DIELS-ALDER反应 无皂乳液聚合 自修复 

分 类 号：Q63[生物学—生物物理学]