双组分互穿网络复合吸水材料的黏弹性研究

Study of Viscoelasticity about Binary Interpenetrating Networks Water Swelling Material

通过乳液聚合制备了具有分子互穿网络结构的吸水材料(WIPN)。应用RS600流变仪研究了吸水材料(WIPN)吸水后的黏弹性及吸水倍率对黏弹性的影响。动态研究表明,吸水材料的固体属性远大于液体属性,弹性模量G′的数量级为104Pa,而黏性模量G″仅在102～103Pa之间;吸水倍率升高,由于交联分子链的弹性减弱,G′、G″均降低;随温度升高,G′平缓降低,G″出现上升拐点,吸水倍率越高,拐点出现得越晚,说明在较高吸水倍率下,聚合物分子链处于紧绷状态,需要较高的能量才能发生应变。稳态蠕变恢复研究表明,材料弹性好,蠕变阶段不易变形,恢复能力强;吸水倍率越高,变形能力越强,残余应变越大。

The water swelling material（WIPN） with molecule interpenetrating networks structure is prepared by emulsion polymerization. The RS600 rheometer is applied to study the viscoelasticity of WIPN and the effect of water absorption rate by theology method. The results of dynamic research indicate that the solid property of containing water WIPN is more than the liquid＇s. The G′ is more than 10^4Pa, while the G″ is only between 10^2Pa and 10^3Pa. Both G′ and G″ are decreased for the flexihility＇s weakening of crosslinked molecule chain with the increasing of water absorption rate. As the temperature increases, the value of G′ decreases gently, the value of G″ appears an ascending inflexion. Water absorption rate is higher, the temperature of inflexion appeared is higher. It explains that it needs more energy for strain to take place tight polymer molecule chain. It is difficult for WIPN strain to take place during creep phase. The higher water absorption rate is, the greater retrieve strain is.