Materiale Plastice
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Materiale Plastice (Mater. Plast.), Year 2003, Volume 40, Issue 3,

Irinel Grecu, Mitachi Strat

Diazobenzene Polymers in Foils and Tablets. Photochromic and Dielectric Properties

Photochromic properties of copolyethers and copolyesters based on bisphenol-A 4,4’-dihydroxydiphenyl, 4, 4’-dihydroxy-azobenzene and 3,3-bis (chloromethyl) oxetane both embedded in a polymer matrix and the pure state, deposed on quartz disks or as powder, have been studied. The photocromic effects have been studied by means of electronic absorption spectra in visible range. This effect is reversible. A general characteristic of the compounds studied in this paper is that the azobenzene groups belonging to the polymer chain are aligned along the polymer chain structure. The nature of the thermally stimulated discharge current for polyether and polyester samples in the temperature range from room temperature to above glass-rubber transition temperature of the studied compounds, with crystallinity degree of about 0.45, is analyzed. Processing the experimental data according to the Gauss’ function (1) has lead to a good agreement between them and the dipolar polarization model that uses the Langevin’s function, L(b) (2). The thermally stimulated current spectrum of the studied compounds shows two peaks at a temperature about 330 and 3444 K. The a peak is at temperature ( 323 -333)K and r peak at (340-355) K. The disorientation of the main chain dipoles (diazo groups) and the realizing of the trapped electrons are probably responsible for the a peak. The changes in the r peak is caused by carries of charges generated in the polar groups of the polymer chain by the thermochromic effect of the diazobenzen groups.

dielectric properties; photocromic effects; polymer chain

Issue: 2003 Volume 40, Issue 3
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