In this work the influence of poly(N-vinylpyrrolidone)(PVP)concentration in water on the organization and dynamics of the corresponding macro-/nanogel networks has been systematically investigated. Irradiation has been performed at the same irradiation dose(within the sterilization dose range)and dose rate. In the selected irradiation conditions, the transition between macroscopic gelation and micro/nanogels formation is observed just below the critical overlap concentration(1 wt%),whereas the net prevalence of intramolecular over intermolecular crosslinking occurs at a lower polymer concentration(below 0.25 wt%). Dynamic–mechanical spectroscopy has been applied as a classical methodology to estimate the network mesh size for macrogels in their swollen state, while 13C NMR spin–lattice relaxation spectroscopy has been applied on both the macrogel and nanogel freeze dried residues to withdraw interesting information of the network spatial organization in the passage of scale from macrotonano.

Dispenza, C., Grimaldi, N., Sabatino, M.A., Bulone, D., Todaro, S., Bulone, D., et al. (2012). Studies of network organization and dynamics of e-beam crosslinked PVPs: From macro to nano. RADIATION PHYSICS AND CHEMISTRY, 81(9), 1349-1353 [10.1016/j.radphyschem.2011.11.057].

Studies of network organization and dynamics of e-beam crosslinked PVPs: From macro to nano

DISPENZA, Clelia;GRIMALDI, Natascia;SABATINO, Maria Antonietta;TODARO, Simona;ALESSI, Sabina;SPADARO, Giuseppe
2012-01-01

Abstract

In this work the influence of poly(N-vinylpyrrolidone)(PVP)concentration in water on the organization and dynamics of the corresponding macro-/nanogel networks has been systematically investigated. Irradiation has been performed at the same irradiation dose(within the sterilization dose range)and dose rate. In the selected irradiation conditions, the transition between macroscopic gelation and micro/nanogels formation is observed just below the critical overlap concentration(1 wt%),whereas the net prevalence of intramolecular over intermolecular crosslinking occurs at a lower polymer concentration(below 0.25 wt%). Dynamic–mechanical spectroscopy has been applied as a classical methodology to estimate the network mesh size for macrogels in their swollen state, while 13C NMR spin–lattice relaxation spectroscopy has been applied on both the macrogel and nanogel freeze dried residues to withdraw interesting information of the network spatial organization in the passage of scale from macrotonano.
2012
Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie
Dispenza, C., Grimaldi, N., Sabatino, M.A., Bulone, D., Todaro, S., Bulone, D., et al. (2012). Studies of network organization and dynamics of e-beam crosslinked PVPs: From macro to nano. RADIATION PHYSICS AND CHEMISTRY, 81(9), 1349-1353 [10.1016/j.radphyschem.2011.11.057].
File in questo prodotto:
File Dimensione Formato  
Rad Phys Chem 2012.pdf

accesso aperto

Dimensione 402.99 kB
Formato Adobe PDF
402.99 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/64992
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 28
  • ???jsp.display-item.citation.isi??? 25
social impact