INVESTIGADORES
GALANTE Maria Jose
artículos
Título:
A simple strategy to generate ligth-responsive azobenzene-containing epoxy networks
Autor/es:
A.B. OROFINO; G.F. ARENAS; I.A. ZUCCHI; M. J. GALANTE; P.A. OYANGUREN
Revista:
POLYMER
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 54 p. 6184 - 6190
ISSN:
0032-3861
Resumen:
Azobenzene containing epoxy networks are a class of photosensitive materials characterized by high
thermal, optical and mechanical stability, promising for reversible optical storage applications. Here, we
propose an encouraging two-step method to fabricate crosslinked coatings by simply reacting an aminefunctionalized
azobenzene and an epoxy resin in bulk for specified times to get soluble products
(network precursors). Thin films based on these precursors were prepared, and thermally crosslinked in
order to obtain high-Tg materials. The optical response of the materials was determined, both before and
after crosslinking. In the case of the samples as prepared, the dynamic time response of the system is fast,
as well as the relaxation of the photoinduced birefringence, as expected due to the high mobility of the
chromophore. On the other hand, crosslinked systems have a slightly slower response, but higher values
of remnant birefringence, providing stability of the photoinduced orientation, what makes them
promising materials to use in optical storage applications. Besides, further analysis on the effect of
temperature on the induced birefringence of the polymeric networks was also conducted to help optimization
of material design. Finally, we had presented some preliminary investigations of surface relief
grating recording in the obtained new materials.