磺化纤维素水凝胶电刺激响应行为的研究

摘要

A novel sulfonated cellulose hydrogel was prepared by crosslinking cellulose with epichlorohydrin firstly and then modifying the cellulose hydrogel with concentrated sulfuric acid.Its swelling properties and electroresponsive behavior in aqueous NaCl solutions were studied.The results indicated that the water take-up ability of the hydrogel decreased with increasing ionic strength of aqueous NaCl solution.The hydrogel swollen in the NaCl solution bent toward the cathode under the non-contact DC electric fields,the bending speed and equilibrium strain increased with increasing of applied voltage,and there was an ionic strength of 0.03mol/kg where its bending speed and equilibrium strain reached their maximum values.Under a cyclical electric field,the hydrogel exhibited the good reversible bending behavior.%以环氧氯丙烷为交联剂，制备了纤维素水凝胶，用浓硫酸对其进行磺酸改性，制备出一种磺化纤维素水凝胶，并研究了该凝胶的溶胀性能、电刺激响应行为。结果表明，该凝胶在NaCl溶液中其平衡溶胀率随NaCl离子强度的增大而减小。在NaCl溶液中于非接触直流电场作用下，凝胶向电场负极弯曲，弯曲速度和应变随外加电压的增加而增大，并随NaCl离子强度的增大于0.03 mol/kg处出现最大值。在循环电场作用下，其电刺激响应行为具有良好的可逆性。