Artículos de revistas
Correlations between Conjugation Length, Macromolecular Dynamics, and Photophysics of Phenylene-Vinylene/Aliphatic Multiblock Copolymers
Fecha
2012Registro en:
JOURNAL OF PHYSICAL CHEMISTRY B, WASHINGTON, v. 116, n. 20, supl. 2, Part 3, pp. 5993-6002, MAY 24, 2012
1520-6106
10.1021/jp2117517
Autor
Bernardinelli, O. D.
Cassemiro, S. M.
Nunes, Luiz Antonio de Oliveira
Atvars, T. D. Z.
Akcelrud, L.
Azevêdo, Eduardo Ribeiro de
Institución
Resumen
This work reports a detailed spectroscopy study of a series of multiblock conjugated nonconjugated copolymers built by p-phenylene vinylene type units (PV) and octamethylene spacers, namely, poly(1,8-octanedioxy-2,6-dimethoxy-1,4-phenylene-1,2-ethenylene) (LaPPS18). The relative proportions of the PV and aliphatic segments were estimated on the basis of solid-state NMR and Raman spectroscopy. The overall structure was characterized by wide angle X-ray diffraction; H-1 wide-line dipolar chemical shift correlation (DIPSHIFT), and centerband-only detection of exchange (CODEX) NMR data, that together with glass transition temperatures allowed us to identify the groups involved in the molecular dynamics. These different structural properties were used to explain the photoluminescence properties in terms of peak position and spectral profile