【摘要】 制备了戊二醛交联的明胶水凝胶 ,并研究了其吸水率、力学性能和电刺激响应行为 .结果表明 ,在NaCl溶液中 ,明胶水凝胶的平衡溶胀比随NaCl溶液的浓度增大而减小 ,经 0 0 1mol LNaCl溶液充分溶胀的明胶水凝胶膜其弹性模量为 4.2 9kPa ,抗张强度为 5 11kPa ,断裂伸长率为 110 %.在NaCl溶液中于非接触的直流电场作用下 ,明胶水凝胶向电场负极弯曲 ,凝胶的弯曲速度和弯曲偏转程度随外加电场的增大而增大 ,随NaCl溶液离子强度的增大出现临界最大值 .在周期性电场作用下 ,其弯曲响应行为具有良好的可逆性 .通过聚电解质凝胶弯曲理论初步解释了其弯曲机理 .更多还原

【Abstract】 A gelatin hydrogel crosslinked with glutaraldehyde has been prepared,and its swelling ratio at equlibium,mechanical properties and stimuli-response b e havior were studied.The results indicated that the water take-up of the gelati n hyd rogel decreased as the concentration of NaCl solutions increased,and the mechan ical properties of gelatin hydrogel films swollen in 0.01?mol/L NaCl solution are shown as follows:4.29 kPa of Young’s modulus,5.11 kPa of tensile strength an d 110% of elongation at break.The hydrogel sheets bended toward the cathode under a non- contact D.C. electric field in NaCl aqueous solutions.The bending speed and defl e ction of the hydrogel sheets increased with increasing of the applied voltage.T he elec troresponsive behavior of the hydrogel was also affected by the electrolyte conc entration of the external NaCl solution,and there is a critical ionic strength of 0. 03.Under a cyclically varying electric field,the hydrogel sheets exhibited a g ood r eversible bending behavior.The bending of gelatin hydrogels was initially expla i ned by a bending theory of polyelectrolyte hydrogels based on the change of osmo t ic pressure due to the ion concentration difference between the inside and the o utside of the hydrogel.更多还原