The synthesis of the new chromophores 2-4-[4-(N,N-dihydroxyethyl-amino)-phenylazo]-phenyl-6-nitrobenzoxazole (1) and 4-[4-(N,N-dihydroxyethylamino)-phenylazo]-benzoic acid (2) is described. Three homopolymers obtained by the polycondensation of 1 with propyloxy-terephthalic acid and 1 and 2 with 2,4-tolylenediisocianate as well as two copolymers obtained by polycondensation of appropriate mixtures of chromophores 1 and 2 with 2,4-tolylene-diisocianate were prepared and characterized. All as-prepared polymers but one (homopolyurethane of 1) were amorphous and exhibited good optical clarity, good thermal stability above the glass transition and solubility in organic solvents. The second-order nonlinear optical behavior of the amorphous polymers was investigated on spin-coated corona-poled films through second harmonic generation (SHG) experiments at 1064 nm. At this wavelength, resonance-enhanced values of the SHG coefficient d33 were found in the range between 6 and 34 pm/V where higher values were observed for polymers with a higher molar content of 1.

Bruno, V., Castaldo, A., Centore, R., Sirigu, A., Sarcinelli, F., Casalboni, M., et al. (2002). Second harmonic generation in polymers containing a new azo chromophore based on phenylnitrobenzoxazole. JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY, 40(10), 1468-1475 [10.1002/pola.10224].

Second harmonic generation in polymers containing a new azo chromophore based on phenylnitrobenzoxazole

CASALBONI, MAURO;PIZZOFERRATO, ROBERTO
2002-01-01

Abstract

The synthesis of the new chromophores 2-4-[4-(N,N-dihydroxyethyl-amino)-phenylazo]-phenyl-6-nitrobenzoxazole (1) and 4-[4-(N,N-dihydroxyethylamino)-phenylazo]-benzoic acid (2) is described. Three homopolymers obtained by the polycondensation of 1 with propyloxy-terephthalic acid and 1 and 2 with 2,4-tolylenediisocianate as well as two copolymers obtained by polycondensation of appropriate mixtures of chromophores 1 and 2 with 2,4-tolylene-diisocianate were prepared and characterized. All as-prepared polymers but one (homopolyurethane of 1) were amorphous and exhibited good optical clarity, good thermal stability above the glass transition and solubility in organic solvents. The second-order nonlinear optical behavior of the amorphous polymers was investigated on spin-coated corona-poled films through second harmonic generation (SHG) experiments at 1064 nm. At this wavelength, resonance-enhanced values of the SHG coefficient d33 were found in the range between 6 and 34 pm/V where higher values were observed for polymers with a higher molar content of 1.
2002
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - FISICA SPERIMENTALE
Settore FIS/03 - FISICA DELLA MATERIA
English
Benzoxazole; Nonlinear optics; Polymers; Polymers and Plastics; Materials Chemistry2506 Metals and Alloys
Bruno, V., Castaldo, A., Centore, R., Sirigu, A., Sarcinelli, F., Casalboni, M., et al. (2002). Second harmonic generation in polymers containing a new azo chromophore based on phenylnitrobenzoxazole. JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY, 40(10), 1468-1475 [10.1002/pola.10224].
Bruno, V; Castaldo, A; Centore, R; Sirigu, A; Sarcinelli, F; Casalboni, M; Pizzoferrato, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/129449
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