Combining Gravimetric and Vibrational Spectroscopy Measurements to Quantify First- and Second-Shell Hydration Layers in Polyimides with Different Molecular Architectures (Articolo in rivista)

Type
Label
  • Combining Gravimetric and Vibrational Spectroscopy Measurements to Quantify First- and Second-Shell Hydration Layers in Polyimides with Different Molecular Architectures (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Alternative label
  • P. Musto, G. Mensitieri, M. Lavorgna, G. Scarinzi, G. Scherillo (2012)
    Combining Gravimetric and Vibrational Spectroscopy Measurements to Quantify First- and Second-Shell Hydration Layers in Polyimides with Different Molecular Architectures
    in The journal of physical chemistry. B (1997 : Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • P. Musto, G. Mensitieri, M. Lavorgna, G. Scarinzi, G. Scherillo (literal)
Pagina inizio
  • 1209 (literal)
Pagina fine
  • 1220 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 116 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • a Institute of Chemistry and Technology of Polymers, National Research Council of Italy, Olivetti Buildings, Via Campi Flegrei 34, 80078, Pozzuoli (NA), Italy b Department of Materials and Production Engineering, University of Naples Federico II, Piazzale Tecchio 80, 80125 Naples, Italy c Institute of Composite and Biomedical Materials, National Research Council of Italy, Piazzale Tecchio, 80-80125 Naples, Italy (literal)
Titolo
  • Combining Gravimetric and Vibrational Spectroscopy Measurements to Quantify First- and Second-Shell Hydration Layers in Polyimides with Different Molecular Architectures (literal)
Abstract
  • In-situ Fourier transform infrared (FTIR) measurements have been carried out at different relative pressures of water vapor to study the H2O diffusion in three polyimides differing in their molecular structure and fluorine substitution. Spectral data have been analyzed by difference spectroscopy, least-squares curve fitting, and two-dimensional (2D) correlation spectroscopy, which provided molecular level information on the diffusion mechanism. In particular, two distinct water species were identified corresponding, respectively, to the first and second-shell hydration layers. The spectroscopic analysis demonstrated that the relative population of these species is a function of the total water content in the system. A method has been devised to quantify the water concentration in the two hydration layers, based on a combination of spectroscopic and gravimetric data. The results have been compared with those from an earlier spectroscopic approach reported in the literature and based on the analysis of the carbonyl region. (literal)
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