http://www.cnr.it/ontology/cnr/individuo/prodotto/ID17900
FTIR spectra of pure helical crystalline phase of syndiotactic polystyrene (Articolo in rivista)
- Type
- Label
- FTIR spectra of pure helical crystalline phase of syndiotactic polystyrene (Articolo in rivista) (literal)
- Anno
- 2006-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1039/b613195f (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- A. R. Albunia, P. Musto, G. Guerra (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
- No. Citazione=2;
Autocitazione=0;
Motore utilizzato per le citazioni=Google Scholar (literal)
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- CNR, Università degli Studi di Salerno. (literal)
- Titolo
- FTIR spectra of pure helical crystalline phase of syndiotactic polystyrene (literal)
- Abstract
- By quantitative evaluation of the spectral changes associated with guest removal from clathrate films as well as by infrared dichroism measurements on uniaxially oriented films, three infrared absorbance peaks (at 1379, 1154 and 841 cm-1) prevailingly associated with the amorphous phase have been located for syndiotactic polystyrene (s-PS) samples with helical crystalline phases. A detailed study relative to the infrared peaks in the wavenumber range 870820 cm-1, corresponding to phenyl CH out-of-plane bending, has shown that the 841 cm-1 peak is fully associated with conformationally disordered sequences only for samples including trans-planar crystalline phases (alfa and beta) but not for samples including helical crystalline phases (gamma, delta and clathrates). This result has been rationalized on the basis of different intermolecular interactions between phenyl rings, occurring for trans-planar and helical s-PS crystalline phases. Moreover, a preparation procedure leading to fully unoriented films has been described for helical semicrystalline films, which generally present different kinds of uniplanar orientation. FTIR spectra of these fully unoriented semicrystalline films, by subtracting out the amorphous phase contribution with a procedure based on the 1379 cm-1 peak, have allowed a straightforward isolation of the spectra of the helical s-PS crystalline phases and the quantitative determination of the amorphous content. (literal)
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