磺化β-环糊精水凝胶的电刺激响应行为

Electro-Stimulate Response Behavior of Sulfonated β-Cyclodextrin Hydrogel

将β-环糊精用环氧氯丙烷交联制成水凝胶,然后用浓硫酸改性引入-SO3H基团,制备了一种电响应性β-环糊精水凝胶,研究了该凝胶的溶胀性能和电刺激响应行为。结果表明,该凝胶在Na2SO4溶液中其平衡溶胀率随Na2SO4离子强度的增大而减小。在Na2SO4溶液中于非接触直流电场作用下,该凝胶向电场负极弯曲,弯曲速度和应变随外加电压的增大而增大,并随Na2SO4离子强度的增大于0.05处出现最大值。但该水凝胶的电响应行为不受外界溶液pH的影响。在循环电场作用下,其电刺激响应行为具有良好的可逆性。

A sulfonated β-cyclodextrin （S-β-CD） hydrogel was prepared by crosslinking β-cyclodextrin with epichlorohydrin firstly, and then modifying with concentrated sulfuric. The results indicate that the water take-up ability of the hydrogel decreases with the ionic strength of aqueous Na2SO4 solution increasing. The hydrogel swollen in the Na2SO4 solution bends toward the cathode under the non-contact DC electric fields, the bending speed and equilibrium strain increase with the increase of applied voltage, and there is an ionic strength of 0.05 where its bending speed and equilibrium strain reach their maximum values. But the electroresponsive behavior of the hydrogel does not strongly depend on pH value of Na2SO4 solution. Under a cyclical electric field, the hydrogel exhibits the good reversible bending behavior.