Slow release from gels in various solvents: a fluorescence study

Pekcan O., Erdogan M.

EUROPEAN POLYMER JOURNAL, cilt.38, sa.6, ss.1105-1111, 2002 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 38 Konu: 6
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1016/s0014-3057(01)00279-8
  • Sayfa Sayıları: ss.1105-1111


A novel in situ steady state fluorescence experiment was performed for studying slow release processes in gels formed by free radical cross-linking copolymerization of methyl methacrylate and ethylene glycol dimethacrylate. Gels were prepared at 75 degreesC with pyrene (P-y) as a fluorescence probe. After drying these gels, slow release experiments were performed in various solvent with different molar-volume, V and Solubility parameters, delta at room temperature by real-time monitoring of the P-y nuorescence intensity. Slow release diffusion coefficients (D) were measured and found to be in between 0.23 x 10(-6) and 2.06 x 10(-6) cm(2) s(-1) depending on the solvent used. (C) 2002 Elsevier Science Ltd. All rights reserved.