In this manuscript, a novel kind of environment-benign water-absorbent sponge material was prepared by cross-linking reaction of polyvinyl alcohol and polyurethane. In order to obtain highly water-absorptive material with excellent mechanical properties, many polyurethane prepolymers with different percentage of free NCO group and viscosity were investigated to improve the properties of the novel sponges. Moreover, the absorptive performance, pore microstructure, and mechanical properties of the obtained sponges was characterized and measured by scanning electron microscope (SEM).

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