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Swelling of polyacrylamide gels in polyacrylamide solutions

✍ Scribed by Nilhan Kayaman; Oğuz Okay; Bahattin M. Baysal

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
157 KB
Volume
36
Category
Article
ISSN
0887-6266

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✦ Synopsis

Swelling behavior of polyacrylamide (PAAm) and polyacrylamide-co-polyacrylic acid (PAAm-co-PAAc) gels was investigated in aqueous solutions of monodisperse PAAms with molecular weights ( M V w ) ranging from 1.5 1 10 3 to 5 1 10 6 g/mol. The volume of the gels decreases as the PAAm concentration in the external solution increases. This decrease becomes more pronounced as the molecular weight of PAAm increases. The classical Flory-Huggins (FH) theory correctly predicts the swelling behavior of nonionic PAAm gels in PAAm solutions. The polymer-polymer interaction parameter x 23 was found to decrease as the molecular weight of PAAm increases. The swelling behavior of PAAm-co-PAAc gels in PAAm solutions deviates from the predictions of the FH theory. This is probably due to the change of the ionization degree of AAc units depending on the polymer concentration in the external solution. ᭧ 1998

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