Slow release from gels in various solvents: a fluorescence study


Pekcan O., Erdogan M.

EUROPEAN POLYMER JOURNAL, vol.38, no.6, pp.1105-1111, 2002 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 38 Issue: 6
  • Publication Date: 2002
  • Doi Number: 10.1016/s0014-3057(01)00279-8
  • Title of Journal : EUROPEAN POLYMER JOURNAL
  • Page Numbers: pp.1105-1111

Abstract

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.