Correlations between Conjugation Length, Macromolecular Dynamics, and Photophysics of Phenylene-Vinylene/Aliphatic Multiblock Copolymers

Author(s)

Bernardinelli, O. D. ^[1] ; Cassemiro, S. M. ^[2] ; Nunes, L. A. O. ^[1] ; Atvars, T. D. Z. ^[3] ; Akcelrud, L. ^[2] ; deAzevedo, E. R. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Paulo - Brazil

^[2] Univ Fed Parana, Paulo Scarpa Polymer Lab, BR-81531990 Curitiba, PR - Brazil

^[3] State Univ Campinas Unicamp, Inst Chem, BR-13084971 Campinas, SP - Brazil

• Document type: Journal article
• Source: Journal of Physical Chemistry B; v. 116, n. 20, p. 5993-6002, MAY 24 2012.
• Web of Science Citations: 5

Abstract

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 (AU)

• FAPESP's process: 09/14153-8 - Photophysics and electroluminescence of organic polymer and dyes
• Grantee: Teresa Dib Zambon Atvars
• Support Opportunities: Regular Research Grants
• FAPESP's process: 09/18354-8 - Dynamics and structure of polymer systems as studied by nuclear magnetic resonance
• Grantee: Eduardo Ribeiro de Azevedo
• Support Opportunities: Regular Research Grants