Gelation of PAAm-PVP composites: A fluorescence study

Gülşen Akin Evingür*, Hakan Kaygusuz, F. Bedia Erim, Önder Pekcan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Hybrid hydrogels are a new class of composite materials. Polyacrylamide (PAAm) hydrogels are mainly produced by free radical crosslinking copolymerization (FCC) of AAm in the presence of N, N′-methylene bis (acrylamide) (BIS) as the crosslinker. Pyranine doped PAAm-poly (N-vinyl pyrrolidone) (PVP) composite were prepared with different amounts of PVP varying in the range between 0.0015 and 0.1 gr. It was observed that pyranine molecules as a fluoroprobe bind to AAm and PVP chains upon the initiation of the polymerization, causing the fluorescence spectra of the bonded pyranines shift to the shorter wavelengths. The sol-gel phase transition and its universality were monitored and tested as a function of PVP contents. Observations around the critical point show that the gel fraction exponent, β, agreed with the percolation result for below 0.025 gr PVP contents. However, classical result was observed above 0.0125 gr PVP content.

Original languageEnglish
Article number1450122
JournalInternational Journal of Modern Physics B
Issue number20
Publication statusPublished - 10 Aug 2014


  • Acrylamide
  • composite gel
  • critical phenomena
  • fluorescence
  • percolation
  • poly (Ni-vinyl pyrolidone)


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