High resolution holographic polymer dispersed liquid crystal gratings are photo-induced periodic structures commonly affected by shrinkage. This phenomenon represents a problem in several application fields such as in high density optical storage. In this work we observed that, by directly monitoring the blue-shift of the reflection peak of the periodic structure, an evident shrinkage reduction occurs using the nitroxide radical Tinuvin770-N-yloxy [(bis(2,2,6,6-tetramethyl-piperidine-1-yloxy-4-yl)-sebacate] as inhibitor of polymerization. This compound is a stable hindered amine light stabilizer-derived free radical, which plays a significant role in the photopolymerization dynamics.
Nitroxide radicals reduce shrinkage in acrylate-based holographic gratings / R., Castagna; Vita, Francesco; Lucchetta, Daniele Eugenio; L., Criante; Greci, Lucedio; P., Ferraris; Simoni, Francesco. - In: OPTICAL MATERIALS. - ISSN 0925-3467. - 30:(2007), pp. 539-544. [10.1016/j.optmat.2006.12.011]
Nitroxide radicals reduce shrinkage in acrylate-based holographic gratings
VITA, Francesco;LUCCHETTA, Daniele Eugenio;GRECI, Lucedio;SIMONI, Francesco
2007-01-01
Abstract
High resolution holographic polymer dispersed liquid crystal gratings are photo-induced periodic structures commonly affected by shrinkage. This phenomenon represents a problem in several application fields such as in high density optical storage. In this work we observed that, by directly monitoring the blue-shift of the reflection peak of the periodic structure, an evident shrinkage reduction occurs using the nitroxide radical Tinuvin770-N-yloxy [(bis(2,2,6,6-tetramethyl-piperidine-1-yloxy-4-yl)-sebacate] as inhibitor of polymerization. This compound is a stable hindered amine light stabilizer-derived free radical, which plays a significant role in the photopolymerization dynamics.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
