New Trends in Architecture of Azo Polymer Materials with Applications in Optical Field. 2. Solvatochromic and Photochromic Investigation

Abstract

In the large family of polymers, the azobenzene derivatives represent one fascinating materials class, along with stylbene and azomethinic derivatives. This interest is explained by combination of the properties of anisotropy with the photoinduced behaviors. The photoinduced birefringence, relief grating, the high optical nonlinearity resulted from the sin-anti isomerism, molecular reorientation, the exceptional stability to writing and erasing by laser radiation, are just the most important arguments for their usage of these polymeric architectures in the NLO field as: LCD, chemical sensing, devices for storage and transmission of information. This presentation covers the development and characterization a new series of materials from viewpoint of the modification of the polymer materials by the chemical transformation of the “common” polymer support an underlining: solvatochromic and photorefractivity properties.

Keywords:

• Azo polymers
• isomerism
• molecular reorientation

Acknowledgments

This work was partially achieved by means of the projects PN 2 IDEI: 7471901-2009 financed by the Romanian Ministry of Education and Research.

Notes

*in the bracelets is marked the substitution degree of the polymer support;

**values according [27];

***E_T(30)(kcal/mol) = hcυ_maxN_A = 2.8591·10⁻³ν_max(cm⁻¹) = 2859/λ_max(nm) [28].

*fraction of photochromic sequences bonded from the total anhydride sequences.

This is evaluate on the UV-vis specific absorption, and verified by elemental analysis.