Effects of surface-crosslinking with glass microspheres on the absorption properties of the superabsorbent polymer (SAP)
발표자
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초록
내용
Superabsorbent polymer (SAP) is a special hydrogel capable of absorbing water due to hydrophilic functional groups. The surface-crosslinking was introduced to improve both the trade-off related gel strength and absorbency. When the surface of SAP is crosslinked, the internal crosslinking density becomes low, whereas the outside one becomes high, leading to the prevention of the gel blocking. We studied the effect of glass microsphere on the absorption properties of SAP during surface-crosslinking. The content of microsphere ranged from 1 to 5 wt%, there was a critical point. As the content of microsphere increased to 2 wt%, the absorption properties increased. But, it decreased at more than 2 wt%. In addition, the absorption properties was higher when microsphere was dissolved in solvent than it was added in powder. The absorption properties of SAP was confirmed by measuring centrifuge retention capacity and absorbency under load. The structure of SAP was confirmed by FT-IR and SEM.