Beaker test method
In this method * A small amount of superabsorbent polymer material is taken (0.1g) and it is placed in the beaker. * 100 ml of deionized water is poured into the beaker. * After 20 min the swollen polymer was separated by using ilter paper* By weighing the polymer, one can find the swollen capacity of the SAP material.Tea bag test method
* In this method, 0.1 g of SAP material is placed into a permeable bag, which is suspended over excess water in a beaker. * Wait 20 min. and weigh the bag and then calculate the percentage of swelling through the following formula: *: (w2-w1)/(w1) % *: w1= weight of the polymer (Before swelling) *: w2= weight of the polymer (After swelling) * ''Note:'' Filter paper only for removing water.Schroeder's paradox
Some polymers exhibit larger experimentally measured swelling capacity when immersed in pure liquid compared to testing with saturated vapor. This phenomenon is known as the Schroeder's paradox.References
Laboratory techniques {{Polymer-stub