Polymorphism in Syndiotactic Polystyrene: An 1H NMR Relaxation Study (Articolo in rivista)

Type

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

Label

• Polymorphism in Syndiotactic Polystyrene: An 1H NMR Relaxation Study (Articolo in rivista) (literal)

Anno

• 1992-01-01T00:00:00+01:00 (literal)

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

• 10.1021/ma00041a008 (literal)

Alternative label

• D. Capitani, C. De Rosa, A. Ferrando, A. Grassi, A.L. Segre (1992)
  Polymorphism in Syndiotactic Polystyrene: An 1H NMR Relaxation Study
  in Macromolecules (Online); American Chemical Society, Washington (Stati Uniti d'America)
  (literal)

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

• D. Capitani, C. De Rosa, A. Ferrando, A. Grassi, A.L. Segre (literal)

Pagina inizio

• 3874 (literal)

Pagina fine

• 3880 (literal)

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

• http://dx.doi.org/10.1021/ma00041a008 (literal)

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

• 25 (literal)

Rivista

• Macromolecules (Rivista)

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

• 7 (literal)

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

• 15 (literal)

Note

• ISI Web of Science (WOS) (literal)
• Scopu (literal)

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

• Istituto di Metodologie Chimiche Dipartimento di Chimica, Università di Napoli Montedipe, Via Taliercio 14, 46100 Mantova Dipartimento di Fisica, Università di Salerno (literal)

Titolo

• Polymorphism in Syndiotactic Polystyrene: An 1H NMR Relaxation Study (literal)

Abstract

• A marked shortening of T, relaxations in solid aromatic polymers can be attributed to O2 adsorbed on the aromatic rings. This effect, observed as a function of temperature, is modulated by the amount of adsorbed O2, Which, in turn, varies according to the molecular packing and crystalline/amorphous ratio. Within the temperature range 77-400 K, semicrystalline syndiotactic polystyrenes (s-PS) in the alpha, beta, and gamma-polymorph modifications were studied by pulse H-1 NMR at 30 MHz. Due to the presence of many relaxation components, 1,2,2-trideuterio-s-PS was synthesized, crystallized, and characterized by X-ray powder diffraction. At low temperature, when both the O2 diffusion and the spin-diffusion processes are slow enough, the backbone-deuteriated polymers exhibit multiple T1 relaxations: three for alpha and beta s-PS and two for gamma s-PS. These T1 components are attributed to crystalline and amorphous phases. From the study of these components as a function of temperature and from direct comparison of T1 values in the different phases, the following conclusions were drawn: (i) Clear differentiation was possible between different s-PS polymorphs. (ii) Determination of the crystalline vs amorphous ratio fully consistent with X-ray diffraction data was achieved. (iii) The amorphous component of different semicrystalline s-PS polymorphs could be distinguished. (literal)

Editore

• American Chemical Society (Editore)

Prodotto di

• Metodologie NMR per lo studio delle scienze omiche (PM.P06.019.003) (Modulo)
• Istituto di metodologie chimiche (IMC) (Istituto)

Autore CNR

• ANNA LAURA SEGRE (Unità di personale interno)
• DONATELLA CAPITANI (Unità di personale interno)

Insieme di parole chiave

• Keywords of "Polymorphism in Syndiotactic Polystyrene: An 1H NMR Relaxation Study" (Insieme di parole chiave)

Incoming links:

Autore CNR di

• DONATELLA CAPITANI (Unità di personale interno)
• ANNA LAURA SEGRE (Unità di personale interno)

Prodotto

• Istituto di metodologie chimiche (IMC) (Istituto)
• Metodologie NMR per lo studio delle scienze omiche (PM.P06.019.003) (Modulo)

Editore di

• American Chemical Society (Editore)

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

• Macromolecules (Rivista)

Insieme di parole chiave di

• Keywords of "Polymorphism in Syndiotactic Polystyrene: An 1H NMR Relaxation Study" (Insieme di parole chiave)