Autonomous And Reversible Bending Response Of Bilayer Hydrogel Actuator Driven By PH Oscillating Reaction

The autonomous responsiveness of deformation of the intelligent polymer deformable smart polymer is of great significance to the development of bionic intelligent materials.A kind of intelligent polymer system with autonomous,cyclic and reversible bending-extension deformations was designed and synthesized by taking the bi-layer hydrogel with different pH responsiveness.?1?P?AA-co-DMA?hydrogel and PDMA NC hydrogel were prepared.The effects of monomer concentration,monomer molar ratio on the tensile properties of P?AA-co-DMA?hydrogel were investigated,as well as the effects of monomer molar ratio and pH of solution on response performance of P?AA-co-DMA?hydrogel.In addition,the effects of SiO₂ content on the tensile properties of PDMA NC gel and the effects of buffer solutions with different pH values on the response properties of hydrogels were investigated.?2?We presented a facile sticking method to realize assembly of hydrogels that benefited from a special hydrogen-bond interaction of PDMA/SiO₂.The influence of SiO₂ content on the adhesion strength was investigated.The influences of pH value and monomer mole ratio of P?AA-co-DMA?gel on the bending deformation of bi-layer hydrogel actuator were further investigated.Elaborate soft actuators such as bridge,imitation octopus,petal and cuboid-pumpkin with hollow structure were prepared.?3?HPD pH oscillation system was constructed in a continuous stirred-tank reactor?CSTR?,and the effects of velocity of solution,temperature and stirred-rate on oscillating period and oscillating amiplitude of oscillation system were investigated.At the same time,the autonomous,cyclic and reversible bending system of hydrogels was achieved by combining with the bi-layer hydrogels with different pH responsiveness.