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Polyacrylate resin composite materials with the mineral exhibit super water absorbency and good degradation ability. In this work, expanded perlite and sodium polyacrylate resin composite materials have been prepared with ceric ammonium nitrate (CAN), N,N’-methylene bisacrylamide (MBA), tapioca starch, and expanded perlite. Fourier transform infrared spectroscopy (FT-IR) and field emission scanning electron microscopy (SEM) are used to characterize the bonds absorption peaks and morphologies. The results suggest that the expanded perlite can graft on sodium polyacrylate resin, and the optimal distilled water and 0.9% NaCl absorbency are 1079 and 253 g/g when the expanded perlite content is 8 wt%, respectively. The swelling water model of the composite materials is firstly simulated to be Voigt-based model. In addition, the composite materials absorbency that is influenced by special characteristics of the expanded perlite has been shown.

Voigt-based swelling water model for super water absorbency of expanded perlite and sodium polyacrylate resin composite materials