【摘要】 为改善聚丙烯酰胺凝胶(PAM)在吸水/脱水过程中对环境变化的响应性,制备了多孔聚氨酯弹性体(PU)与PAM的互穿网络结构(IPN),测试其在吸水/脱水过程中的质量和体积变化,并与PAM凝胶的响应行为进行比较,研究PU网络的回弹作用对PAM凝胶吸水/脱水行为的影响.分析表明,吸水过程中PU网络的作用主要表现为后期对溶胀网络的束缚;而在脱水过程中,其回弹行为对溶胀PAM凝胶的初期体积收缩具有明显的加速作用.这种PU/PAMIPN结构可以提高PAM作为传感/驱动器件的环境响应性.更多还原

【Abstract】 Interpenetrating polymer network (IPN) hydrogels composed of polyacrylamide(PAM) and polyurethane (PU) were synthesized in order to improve the responsive rate of PAM hydrogels.The changes of mass and volume of PU/PAM IPN hydrogels were measured in the process of absorbing-water/air-drying.By comparing the swelling/deswelling behaviors between PU/PAM IPN and PAM hydrogels,the effects of elastic PU network on responsive rate of PAM hydrogels were investigated.In the absorbing-water process,the PU network hindered the further expansion of swollen network rather than increase the swelling rate of PAM hydrogel obviously;whereas,in the initial stage of air-drying process the elastic network of PU could accelerate the deswelling process on a large scale due to the elastic recovery of PU network extended.Owing to the rapid response to the change of water content,the PU/PAM IPN hydrogels have large potentialities to be utilized as sensor and actuator in smart material systems.更多还原