Research on pH-sensitive Polyacrylic acid (PAA) Hydrogel Trapped with Polysodium-p-styrenesulfonate (PSS)

摘要

A series of polyacrylic acid (PAA) hydrogel trapped with polysodium-p-styrenesulfonate (PSS) were prepared and characterized then by FTIR analysis. The swelling behavior of PAA hydrogel in alkaline environment was improved due to the addition of PSS. As the ionic concentration in solution increased, the swelling ratio of PAA/PSS showed an up-and-down trend with a maximum swelling ratio at pH = 9 ca. However, the swelling rate of PAA was decreased after adding PSS. A theoretical model based on the multi-interactions between PAA hydrogel network and trapped PSS chains including electrostatic repulsive interaction, entangling interaction, ionic intensity interaction and osmotic pressure was proposed to explain the above mentioned experimental phenomena.