INVESTIGADORES
GALANTE Maria Jose
artículos
Título:
Surface relief gratings inscription in linear and crosslinked azo modified epoxy-isocyanate polymers
Autor/es:
LUCIANA SÁIZ; PAULA AINCHIL; ILEANA A. ZUCCHI; PATRICIA A. OYANGUREN; MARÍA J. GALANTE
Revista:
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Editorial:
JOHN WILEY & SONS INC
Referencias:
Lugar: New York; Año: 2015
ISSN:
0887-6266
Resumen:
This work analyses the SRG forming ability of a linear
and a crosslinked polymer, both based on the same azo
chromophore (Disperse Red 19, DR19) and diisocyanate (4,4?-
metilen-bis(cyclohexyl isocyanate), DI) with similar glass transition
temperature values. The effect of the experimental and
geometrical parameters (such as beams polarization direction
and interference pattern spacing) on the surface modulation
process was examined as well. The absence of photodegradation
or bleaching was corroborated by comparing Raman spectra
inside and outside the SRG zone. Being a very important
subject matter, the influence of crosslinking on the inscription
rates and thermal stability of SRGs was investigated.
Crosslinked films with an interesting modulation and good grating
stability, even at high temperatures (160 C), were
obtained. Gratings shape was retained, and significant diffraction
was still observed even well above the Tg of the bulk sample.