2-Oxazoline based photo-responsive azo-polymers. Synthesis, characterization and isomerization kinetics

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[1] [1,Spiridon, Mitica Cezar
[2] 1,Jerca, Florica Adriana
[3] Jerca, Valentin Victor
[4] Vasilescu, Dan Sorin
[5] Vuluga, Dumitru Mircea
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Jerca, F.A. (adriana_jerca@yahoo.com) | 1600年 / Elsevier Ltd卷 / 49期
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New azo-polymer structures; with azo content ranging from 15% to ≈100%; are prepared by attaching a side-chain azo-moiety onto poly(isopropenyloxazoline-co-styrene)s and poly(isopropenyloxazoline). Postcoupling conditions are determined by kinetic investigations. Polymer compositions are evaluated from UV; 1H NMR; titrimetry and elemental analysis. Chemical modification of polymers is evidenced by FTIR and 1H NMR spectroscopy. Thermal analysis sustain that azobenzene loads up to 0.67 M ratio result in an increase of Tgs; and that the azo dye content dictates the thermal stability of the modified copolymers. Both solution and solid-state trans-cis-trans isomerization kinetics are conducted. Cis-to-trans thermal relaxation rate constants of azo-polymers increase compared to the model compound used in solution measurements. Also; distinct relaxation mechanisms are assessed; as a function of solvents polarity and temperature for both polymers and model compound. For the azo-polymer thin films; the lifetime of cis isomers is tuned from polymer composition (dye load) to exhibit slow or fast relaxation. © 2012 Elsevier Ltd. All rights reserved;
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