Dissolution of a percolation cluster on UV-cured polymeric films: a fluorescence study


Pekcan O., Ugur S.

11th International Conference on Surface and Colloid Science, Iguassu Falls, Brezilya, 01 Eylül 2003, cilt.128, ss.92-97 identifier identifier

  • Cilt numarası: 128
  • Doi Numarası: 10.1007/b97090
  • Basıldığı Şehir: Iguassu Falls
  • Basıldığı Ülke: Brezilya
  • Sayfa Sayıları: ss.92-97

Özet

The steady-state fluorescence technique was used for studying dissolution of UV-cured polymer films. These films were formed from poly(methyl methacrylate) chains labeled with pyrene which was introduced as a fluorescence probe to monitor the dissolution processes. Poly(methyl methacrylate) films with various ethylene glycol dimethacrylate contents, cured by UV radiation for 3 and 25 h, were dissolved in chloroform-heptane (20-80%) mixtures. The percolation threshold (p(c) = 0.35) found for films irradiated for 3 h obeys the site percolation model, however the percolation threshold (p(c) = 0.25) measured for films irradiated for 25 h obeys the bond percolation model.