【作者】 李雅瑜； 周天扬； 施冬健；

【Author】 Li Yayu;Zhou Tianyang;Shi Dongjian;The Key Laboratory of Synthetic and Biological Colloids,Ministry of Education; School of Chemical and Material Engineering,Jiangnan University;

【机构】 合成与生物胶体教育部重点实验室江南大学化学与材料工程学院；

【摘要】 自修复材料可将性能修复至原始性能而受到越来越多的关注。氢键是一种较常见的动态分子间作用,因而常被可于自修复体系的构筑。聚氨酯弹性体具有多种优异的性能及加工性能,因而受到广泛的关注与应用。虽然聚氨酯具有良好的力学性能,但由于其在生产和/或使用过程中易于受到一定的损伤,从而会影响其使用寿命。由于聚氨酯主链中存在可形成氢键的结构,其可以通过一定的氢键作用实现材料的部分性能修复,但单氢键修复的时间长、效率较低,通过在体系中引入多重氢键修复有望解决这些问题。丙烯酰基甘氨酰胺(NAGA)是一种含有双酰胺基团的单体,其聚合物(PNAGA)可形成多重氢键。因而,本研究将聚氨酯与PNAGA通过复合,制备具有优异自修复性能的弹性体。结果表明,PNAGA链段的引入,有利于提高复合材料的机械性能;复合材料切断后,复合材料显示较好的修复性能。更多还原

【Abstract】 It is obvious that the materials with self-healing property can recover the mechanical property of materials to original performances. The self-healing materials can be divided into two types: external self-healing and intrinsic self-healing materials. The external self-healing materials can repair themselves with the help of a repairing agent. Intrinsic self-healing materials mainly depend on reversible covalent bonds or/and non-covalent bonds to complete the self-healing behaviors. Hydrogen bonding, as a kind of dynamic intermolecular interaction, can be used to build self-healing systems. N-acryloyl glycinamide(NAGA) contained two amide groups, which can form a tetra-hydrogen bond for the preparation of self-healing materials. Polyurethane elastomers have widely applications due to their excellent mechanical and processing properties. Although polyurethane has outstanding properties, the materials could be damaged during production and/or using processes, which may cut down its service life. Therefore, a certain method should be used to extend the life of the materials as well as maintain the properties of the materials. The chains of polyurethane exist numbers of hydrogen bonds. Therefore, the polyurethane elastomers with multiple hydrogen bonds as dynamic bonding could prepared self-repairing elastomers. The polyurethane materials with excellent performance are prepared to prolong its service life, and broaden its application areas.更多还原