Block copolymers P(MA4-block-MMA) 10 and P(MA4-block-MMA) 20 and a random copolymer P(MA4-ran-MMA) 10 were prepared from azobenzene methacrylate (MA4) and methyl methacrylate (MMA). The former monomer was introduced as both a photoresponsive and a mesogenic component, and the latter as a transparent non-mesogenic component. Thin films of the copolymers were used to investigate all-optical writing by linear-polarized illumination in the pulsed regime to modify the local birefringence at the microscopic scale. The optical properties of P(MA4-block-MMA) 10 were compared with those of P(MA4-ran-MMA) 10 having the same chemical composition (10 mol% MA4) but different distributions of the two components. It was found that in the block copolymers relatively intense pulses as short as 100 mu s produced a remarkable local increase in the birefringence, stable in the time-scale (up to several days) explored in the experiment. In contrast, efficient and stable optical modifications could not be achieved in the random copolymer.

Menghetti, S., Alderighi, M., Galli, G., Tantussi, F., Morandini, M., Fuso, F., et al. (2012). All-optical pulsed writing in azobenzene copolymer films in the sub-millisecond regime. JOURNAL OF MATERIALS CHEMISTRY, 22(29), 14510-14517 [10.1039/c2jm30596h].

All-optical pulsed writing in azobenzene copolymer films in the sub-millisecond regime

Alderighi, Michele;
2012-01-01

Abstract

Block copolymers P(MA4-block-MMA) 10 and P(MA4-block-MMA) 20 and a random copolymer P(MA4-ran-MMA) 10 were prepared from azobenzene methacrylate (MA4) and methyl methacrylate (MMA). The former monomer was introduced as both a photoresponsive and a mesogenic component, and the latter as a transparent non-mesogenic component. Thin films of the copolymers were used to investigate all-optical writing by linear-polarized illumination in the pulsed regime to modify the local birefringence at the microscopic scale. The optical properties of P(MA4-block-MMA) 10 were compared with those of P(MA4-ran-MMA) 10 having the same chemical composition (10 mol% MA4) but different distributions of the two components. It was found that in the block copolymers relatively intense pulses as short as 100 mu s produced a remarkable local increase in the birefringence, stable in the time-scale (up to several days) explored in the experiment. In contrast, efficient and stable optical modifications could not be achieved in the random copolymer.
2012
Menghetti, S., Alderighi, M., Galli, G., Tantussi, F., Morandini, M., Fuso, F., et al. (2012). All-optical pulsed writing in azobenzene copolymer films in the sub-millisecond regime. JOURNAL OF MATERIALS CHEMISTRY, 22(29), 14510-14517 [10.1039/c2jm30596h].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/976212
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo