一种硼酸酯动态交联环氧树脂的合成与性能

利用巯基与环氧的点击反应，向环氧体系中引入二醇结构，并通过硼酸酯键对其进行交联，制备了一系列不同流变性能和玻璃化转变温度的可塑环氧树脂材料。研究了不同的配方对材料性能的影响，结果表明通过改变交联剂与动态链结的比例，体系的流变性能可以被调控；另一方面，改变软硬环氧组分的比例可以使材料的玻璃化转变温度在14.6~36.5℃之间调节。制备了该可塑环氧树脂与密胺通孔泡沫的复合材料，该材料具备良好的快速自黏结性能。材料断裂后，在10 s内即可达到最大黏结强度，且经多次拆卸-黏结循环后，黏结强度可以保持在约0.06 MPa。

Synthesis and properties of epoxy resin crosslinked by dynamic boronic ester bonds

A series of dynamic covalent polymer networks providing various rheological properties and glass transition temperatures were prepared via firstly introducing a diol group into an epoxy molecule through a thiol-epoxy click reaction and secondly crosslinking the diol groups by dynamic borate bonds. Effect of formulation on the properties of the materials was investigated. The rheological properties of the materials can be adjusted by tuning the ratio of the crosslinking agents and the exchangeable borate bonds. Glass transition temperature of the polymer can be adjusted from 14.6℃ to 36.5℃ by changing the ratio of the fed soft and hard epoxy components. A composite material is prepared by introducing the dynamic network into an open porous melamine foam. Such a composite can be rapidly self-welded in a few seconds after it had been cut. The welding performance is found to retain 0.06 MPa after 20 disassembling-bonding cycles, showing a good repeatability.