Heterogeneities in the dynamics of a molecular tracer in mesogenic and nonmesogenic azobenzene copolymers (Articolo in rivista)

Type

• Prodotto della ricerca (Classe)
• Articolo in rivista (Classe)

Label

• Heterogeneities in the dynamics of a molecular tracer in mesogenic and nonmesogenic azobenzene copolymers (Articolo in rivista) (literal)

Anno

• 2006-01-01T00:00:00+01:00 (literal)

Alternative label

• Andreozzi, L; Autiero, C; Faetti, M; Zulli, F; Giordano, M (2006)
  Heterogeneities in the dynamics of a molecular tracer in mesogenic and nonmesogenic azobenzene copolymers
  
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Andreozzi, L; Autiero, C; Faetti, M; Zulli, F; Giordano, M (literal)

Pagina inizio

• 363 (literal)

Pagina fine

• 371 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 450 (literal)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy; Univ Pisa, INFM, I-56127 Pisa, Italy; Univ Pisa, Dipartimento Chim & Chim Ind, I-56127 Pisa, Italy; Univ Pisa, INSTM, I-56127 Pisa, Italy (literal)

Titolo

• Heterogeneities in the dynamics of a molecular tracer in mesogenic and nonmesogenic azobenzene copolymers (literal)

Abstract

• We studied by electron spin resonance (ESR) spectroscopy the reorientational dynamics of the cholestane spin probe dissolved in the matrix of the PMA4 40/60 copolymer containing methyl methacrylate (MMA, 40 mol%) and azobenzene methacrylate (MA4, 60 mol%) counits. Heterogeneities in the probe dynamics at the nanometer length scale were evidenced and attributed to the existence of molecular sites with slow and fast spinning correlation times. Different dynamic regimes were also observed with a crossover temperature T-C that was correlated with the glass transition temperature T-g of the copolymer, T-C = 1.17 T-g. Even though the nematic-to-isotropic transition temperature could not be detected, the probe dynamics experienced the onset of nematic order at the molecular level. The results are compared with those of the closely related nematic PMA4 30/70 copolymer. (literal)

Prodotto di

• Film di materiali polimerici: effett di confinamento superficiale ed applicazioni (MD.P01.017.001) (Modulo)

Autore CNR

• LAURA ANDREOZZI (Unità di personale esterno)

Insieme di parole chiave

• Parole chiave di "Heterogeneities in the dynamics of a molecular tracer in mesogenic and nonmesogenic azobenzene copolymers" (Insieme di parole chiave)

Incoming links:

Autore CNR di

• LAURA ANDREOZZI (Unità di personale esterno)

Prodotto

• Film di materiali polimerici: effett di confinamento superficiale ed applicazioni (MD.P01.017.001) (Modulo)

Insieme di parole chiave di

• Parole chiave di "Heterogeneities in the dynamics of a molecular tracer in mesogenic and nonmesogenic azobenzene copolymers" (Insieme di parole chiave)