"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Fluorescence studies of the self- organization phenomena in film state and solutions of some polyurethanes

G. STRAT1, I. GRECU1, S. GURLUI2,3,* , M. STRAT2, V. GRECU1, I. LIHTETCHI4, S. STRATULAT3

Affiliation

  1. “Gh.Asachi “Technical University of Iasi, Faculty of Physics, Bdul Carol I nr 11, Iasi, 700506 Romania
  2. “Al.I.Cuza” University of Iasi, Romania
  3. UMF GR T Popa ,Iasi, Romania
  4. Transilvania University of Brasov

Abstract

The fluorescence properties of stilbene- polyurethane were studied by means of trans-cis photo isomerism and fluorescent emission of the stilbene in polycation and compared with urethane-stilbene derivative and with another cationomer with fluorophore introduced via quaternization of the same precursor with urethane- stilbene halide. In the case of pyrenepolyurethane the process of excimer formation between the pyrene molecules attached to the ionic polyurethane was investigated in tetrahydrofuran (THF), dimethylformamide (DMF) and film state. The formation of aggregates or core–shell micelles was sustained by the fluorescence data, which indicated the existence of pyrene units in the ground state of the molecule, giving rise thus to an explanation for the high excimer-to monomer intensity ratio..

Keywords

Polyurethane, Film, Self-organization, Fluorescence.

Submitted at: April 15, 2008
Accepted at: June 9, 2008

Citation

G. STRAT, I. GRECU, S. GURLUI, M. STRAT, V. GRECU, I. LIHTETCHI, S. STRATULAT, Fluorescence studies of the self- organization phenomena in film state and solutions of some polyurethanes, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 6, pp. 1519-1521 (2008)