亲水性形状记忆环氧树脂制备及表面浸润性调控

A hydrophilic shape memory epoxy resin was prepared by introducing polyethylene glycol(PEG) into the 4, 5-epoxy cyclohexane-1, 2-2-phthalate glycidyl ester(TDE-85) epoxy/m-phenylenediamine(MXDA) system, meanwhile, its surface wettability could be controlled by changing its pillar structure under external thermal-stimuli. The result shows that the introduction of PEG effectively increases the hydrophilicity of TDE-85 epoxy resin, and the optimal amount of PEG is 20%(mass fraction). In this condition, the water contact angle is about 54 °, indicating the realization of wetting conversion from the original hydrophobic TDE-85 epoxy resin/MXDA curing system(water contact angle is about 108°) to the hydrophilic TDE-85/MXDA/PEG system. The T_g of the obtained material is 71℃, and its shape fixed ratio and recovery ratio are 96.10% and 99.97%, respectively, meaning that the obtained material has a good shape memory property. The micropillars onto the surface by the template method, reversible wetting switching between the hydrophilicity(51°) and the superhydrophilicity(0°) can be realized based on the shape memory ability.