2.1.8.2. Absorbency Under Load (AUL) - BADA
2.1.8.2. Absorbency Under Load (AUL) - BADA
2.1.8.2. Absorbency Under Load (AUL) - BADA
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Figure 16. Retention capacity and absorption under load as a function of crosslink density of the<br />
superabsorbent polymer [17]<br />
2.1.8.3. Test Device of <strong>AUL</strong> Method<br />
<strong>AUL</strong> was measured by making use of a piston allows additional weights on the top of the<br />
superabsorbent sample. The test system consists of a porous filter plate was placed in a petri dish,<br />
and 0.9% by weight sodium chloride solution (Normal Saline) was added to the top of the filter<br />
plate. A filter paper was placed on the filter plate to completely wet with saline solution.<br />
A quantity of dried superabsorbent polymer (0.5 g) was placed into contact with a saline solution<br />
on to the filter screen of test device (a cylinder with diameter=60mm, height=50mm) (Fig.17).<br />
A standard weight to attain a load of 0.3 psi (or 0.7 psi) is placed on the top of the superabsorbent<br />
polymer. After 60 minutes, the swollen hydrogel was weighted, and absorbency under load was<br />
calculated by using the equation (2).<br />
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