Low temperature specific heat of heterocyclic polymer networks: Effect of network density (Articolo in rivista)

Type
Label
  • Low temperature specific heat of heterocyclic polymer networks: Effect of network density (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1080/14786430802459545 (literal)
Alternative label
  • Carini G. Jr, Carini G., D'Angelo G., Tripodo G., Bartolotta A., Salvato G., Hong L. (2008)
    Low temperature specific heat of heterocyclic polymer networks: Effect of network density
    in Philosophical magazine (2003, Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Carini G. Jr, Carini G., D'Angelo G., Tripodo G., Bartolotta A., Salvato G., Hong L. (literal)
Pagina inizio
  • 33 (literal)
Pagina fine
  • 35 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 88 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Università di Messina, Dipartimento di Fisica, Messina, Italy CNR, Sez Messina, Istituto Processi Chimico Fisici 3. Univ Akron, Dept Polymer Sci, Akron, OH 44325 USA (literal)
Titolo
  • Low temperature specific heat of heterocyclic polymer networks: Effect of network density (literal)
Abstract
  • Measurements of low frequency Raman scattering and low temperature specific heat between 2 and 20 K have been performed in two glassy, heterocyclic polymer networks. The effective network densities of heterocyclic polymer networks are varied by changing the ratio of bi- and mono-functional isocyanate monomers, leaving the overall chemical structure essentially unchanged. A boson peak at similar to 20 cm(-1) characterizes the Raman spectra at room temperature of both samples. Below 10 K, the specific heats deviate from a cubic temperature dependence, as predicted by the Debye theory, and reveal an excess specific heat, having the shape of a well-defined peak in a C(p)/T(3) plot with a maximum at similar to 5 K. The increase in effective network density is accompanied by a slight decrease in excess specific heat. These observations have been explained in terms of additional low-energy vibrations associated with the monomers building the polymer networks. (literal)
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