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Drying of PAAm hydrogels at various temperatures: A fluorescence study

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Date

2007-05

Author

Aktaş, Demet Kaya
Evingür, Gülşen Akın
Pekcan, Mehmet Önder

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Citation

Aktaş, D., Pekcan, M. Ö. & Evingür, G. (2007). Drying of PAAm hydrogels at various temperatures: A fluorescence study. Journal of Macromolecular Science, Part B, 46(3), 581-590. doi:10.1080/00222340701257950

Abstract

The steady-state fluorescence (SSF) technique was employed for studying the drying of polyacrylamide (PAAm) hydrogels. Disc-shaped hydrogels were prepared by free-radical crosslinking copolymerization of acrylamide (AAm) with N,N'-methylene bisacrylamide (BIS) as crosslinker in the presence of ammonium persulfate (APS) as an initiator. Pyranine (P) was introduced as a fluorescence probe and the intensity of pyranine was monitored during in situ drying at various temperatures. It was observed that the fluorescence intensity of pyranine increased during the drying process. A supporting, gravimetrical experiment was also performed. A phenomenological equation was introduced to determine the desorption coefficient, D, of water molecules from the drying hydrogels at various temperatures. The desorption activation energy, triangle E-d, values were measured for the drying processes and found to be 91.08 and 36.82 kJ mol(-1) by fluorescence and gravimetrical methods, respectively. This difference most probably originates from the origin of the techniques; the fluorescence technique measures the parameters at a molecular level, whereas the gravimetrical technique measures a parameter in the bulk.

Source

Journal of Macromolecular Science, Part B: Physics

Volume

46

Issue

3

URI

https://hdl.handle.net/11729/272
http://dx.doi.org/10.1080/00222340701257950

Collections

  • FEF - Makale Koleksiyonu | Fizik Bölümü / Department of Physics [147]
  • WoS İndeksli Makale Koleksiyonu [807]



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