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Colloid and Polymer Science

, Volume 288, Issue 9, pp 969–980 | Cite as

Probing the internal environment of PVP networks generated by irradiation with different sources

  • Mariaelena Ricca
  • Vito Foderà
  • Daniela Giacomazza
  • Maurizio Leone
  • Giuseppe Spadaro
  • Clelia DispenzaEmail author
Original Contribution

Abstract

Poly(N-vinyl-2-pyrrolidone) (PVP) hydrogels have been synthesised from the aqueous solutions of the same linear polymer by two different radiation sources: electron beams and UV rays. The present investigation couples conventional hydrogel characterisation techniques with the study of the partition equilibria, fluorescence behaviour and release of two different molecular probes, 1-anilino-8-naphthalene sulphonate (ANS) and Thioflavin T (ThT). The two probes have comparable molecular weight and different structural and optical properties. The ‘chemical’ networks produced upon irradiation in different experimental conditions presented quite distinctive mechanical spectra, yielded to different porous solids upon freeze-drying and showed specific rehydration ratios when ‘equilibrated’ in water. More interestingly, they offered ‘hydrophobic pockets’ to host the ANS molecules in a way that the probe is completely occluded from water, making it fluoresce. Conversely, the generated PVP networks did not show any specific affinity towards the hydrophilic ThT that was only barely untaken.

Keywords

Hydrogels Poly(N-vinyl-2-pyrrolidone) Electron beam irradiation UV irradiation Rheology Fluorescent probes 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Mariaelena Ricca
    • 1
  • Vito Foderà
    • 2
    • 3
    • 4
  • Daniela Giacomazza
    • 3
  • Maurizio Leone
    • 2
    • 3
  • Giuseppe Spadaro
    • 1
  • Clelia Dispenza
    • 1
    Email author
  1. 1.Dipartimento di Ingegneria Chimica dei Processi e dei MaterialiUniversità di PalermoPalermoItaly
  2. 2.Dipartimento di Scienze Fisiche ed AstronomicheUniversità di PalermoPalermoItaly
  3. 3.CNR—Istituto di BiofisicaPalermoItaly
  4. 4.Sector of Biological and Soft Systems, Department of Physics, Cavendish LaboratoryUniversity of CambridgeCambridgeUK

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