INVESTIGADORES
GALANTE Maria Jose
artículos
Título:
Polyurethane-epoxy based azopolymers: influence of chemical structure over photoinduced birefringence
Autor/es:
L.M. SÁIZ; P. A. OYANGUREN; M.J. GALANTE
Revista:
REACTIVE & FUNCTIONAL POLYMERS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 72 p. 478 - 485
ISSN:
1381-5148
Resumen:
A comparative study of the influence of the competitive reactions that can take place in epoxy?isocyanate
based azo systems over optical behavior was developed.
Diverse disperse red 19 (DR 19) azo urethane oligomers (PUs) were synthesized and characterized
using size exclusion chromatography (SEC), Fourier transform infrared (FTIR), and UV?visible spectroscopy.
Based on these urethane oligomers, epoxy-PU networks having isocyanurate and oxazolidone rings
in their structures were prepared in different isocyanate/epoxy stoichiometric ratios, r = eq. NCO/eq.
epoxy (0.5, 1, and 2).
Photoinduced anisotropy (Dn), remnant birefringence (RB) and dichroism were measured for the
resulting polymers and evaluated as function of their Tgs and chemical structures. Final materials exhibited
very high values of Dn and RB being promised materials for using in optical storage information
devices.r = eq. NCO/eq.
epoxy (0.5, 1, and 2).
Photoinduced anisotropy (Dn), remnant birefringence (RB) and dichroism were measured for the
resulting polymers and evaluated as function of their Tgs and chemical structures. Final materials exhibited
very high values of Dn and RB being promised materials for using in optical storage information
devices.Dn), remnant birefringence (RB) and dichroism were measured for the
resulting polymers and evaluated as function of their Tgs and chemical structures. Final materials exhibited
very high values of Dn and RB being promised materials for using in optical storage information
devices.Tgs and chemical structures. Final materials exhibited
very high values of Dn and RB being promised materials for using in optical storage information
devices.Dn and RB being promised materials for using in optical storage information
devices.