Study on swelling properties of the super-absorbent hydrogel film based on poly(vinyl alcohol)/lignin/chitosan
Abstract
The composite hydrogel film based on poly ( vinyl alcohol ) , lignin, and chitosan (PLCG) was synthesized with glyoxal crosslinker. PLCG mixture was prepared by hydrothermal method, then the film was formed by casting method on a petri dish and crosslinked at 80 °C within some period s . Well-prepared samples were analyzed with Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) , X-Ray Diffraction (XRD), and swelling behavior . The obtained results of the water swelling measurements show that the PLCG hydrogel film had outstanding water swelling ability up to 797% after 24 hours of immersion test in neutral distilled water at 25 ℃ and obtained maximum swelling ratio to 826% compared to the dried sample. The surface has many porous structures that increase the adsorption capacity as revealed by SEM images. With outstanding properties, PLCG hydrogel film is considered as environmentally friendly and non-toxic material with good water-swelling materials.