黄原胶/聚乙烯醇互穿网络水凝胶的电刺激响应行为

Electro-Stimulate Response Behavior of Xanthan Gum/Polyvinyl Alcohol Interpenetrating Networks Hydrogel

以戊二醛为交联剂,制备了黄原胶/聚乙烯醇(XG/PVA)互穿聚合物网络水凝胶,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,该水凝胶的平衡溶胀比随NaCl溶液离子强度增大而减小,随pH值的增大而增大,当pH≥7时基本保持不变;经离子强度为0.01 mol/L NaCl溶液充分溶胀的XG/PVA互穿聚合物网络水凝胶其弹性模量为0.9844 MPa,拉伸强度为1.5691 MPa,断裂伸长率为1.60;在非接触的直流电场作用下,于NaCl溶液中,该水凝胶发生弯曲,凝胶的弯曲速度和弯曲偏转程度随外加电场的增加而增大;NaCl溶液离子强度对凝胶弯曲行为产生影响,当溶液离子强度I≤0.05时,凝胶向电场负极弯曲,当溶液离子强度I≥0.05时凝胶向电场正极弯曲;在循环电场作用下,其弯曲响应行为具有良好的可逆性。

Xanthan gum （XG）/polyvinyl alcohol（PVA） interpenetrating polymer networks hydrogel was prepared by the crosslinking reaction of xanthan gum and polyvinyl alcohol with glutaraldehyde. Swelling performance, mechanical properties and electro-stimulate response behavior of the XG/PVA interpenetrating networks hydrogel were studied. The results show that the interpenetrating polymer networks hydrogel equilibrium swelling ratio decreases as the ionic strength of NaC1 solutions increases, increases as pH value increases, and remains unchanged above pH value of 7. The mechanical properties of XG/PVA interpenetrating networks hydrogel swollen in 0.01tool/ L NaC1 aqueous solution were as follows： elasticity modulus of 0. 9844 MPa, tensile strength of 1. 5691MPa and elongation at break of 1.60. The hydrogel bends under a non-contact DC electric field in 0.01mol/L NaCl aqueous solutions. The bending speed and deflection of the hydrogel increase with the increase of the applied voltage. NaC1 solution ionic strength affectes bending behavior of the gel. When the NaC1 solution ionic strength is smaller than 0.05, the gel bends toward to negative electrode. When the ionic strength is greater than 0.05, the gel bends toward the positive electrode. Its bending response behavior has a good reversibility under the cycle electric field.