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Temperature dependence of swelling of crosslinked poly(N,N′-alkyl substituted acrylamides) in water

✍ Scribed by You Han Bae; Teruo Okano; Sung Wan Kim

Book ID
105338225
Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
730 KB
Volume
28
Category
Article
ISSN
0887-6266

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✦ Synopsis

Abstract

The swelling of crosslinked poiy(N,N′‐alkyl substituted acrylamides) in water was studied in relation to temperature changes. Conventional swelling theory and separation of the polymer solvent interaction parameter into enthalpic and entropic contributions were used to characterize the temperature dependence of swelling in water. The thermosensitivity of swelling can be attributed to the delicate hydrophilic/hydrophobic balance of polymer chains and is affected by the size, configuration, and mobility of alkyl side groups. A sharp swelling transition may occur at an optimum hydrophilic/hydrophobic balance but was found only in the N‐isopropylacrylamide network among the networks tested. This swelling transition pattern was also reflected by the endothermic peak of the DSC thermogram of the swollen sample.

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