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The swelling capacity of a polymer is determined by the amount of liquid material that can be absorbed. This test can done by two methods:
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 filter paper
- By weighing the polymer, one can find the swollen capacity of the SAP material.
Tea bag test method
- In this method, Take 0.1g of SAP material and put the bag suspended over the excess watered beaker.
- Note the time 20 min. And weigh the bag and we 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.
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