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Studies on azobenzene chromophores content and its localization in functionalized poly(esterimide)s

Wanic A., Siwy M., Schab-Balcerzak E.

Polish Journal of Applied Chemistry

2009

Vol. 53, nr 4

277-294

In this article determination of azobenzene chromophore content in poly(esterimide)s by 13C NMR spectroscopy was reported for the first time. Azopolymers were obtained by a posf-azo-coupling reaction. The chemical shifts of carbon atoms signal characteristic for evaluation of chromophores load level in polymers were established based on analysis of several proper compounds. It was found that the most important for such analysis are the ranges 147-155 ppm and 112-116 ppm in 13C NMR spectrum. The calculated degree of poly(estrimide)s dye functionalization was compared with results estimated from UV-Vis spectroscopy and were in good agreement. The obtained results led to conclusion that 13C NMR spectroscopy is useful tool for determination chromophore content and moreover its localization in polymer. The elaborated method could be applied not only for polymers investigated in this work but also for all polyimides functionalized by azobenzene derivatives.

Dynamical system of measuring of small inclination angles

Wanic A.

Geodezja i Kartografia

2000

T. 49, z. 4

195-204

This paper presents a new method of measuring of small inclination angles. The method consists in application of a pendulum with a diaphragm coworking with an optoelectronical barrier. Results of studies of the constructed device are also presented, they focused on determination of drift of the measured inclination angles as well as variation of the period of the complete oscillation of the pendulum for positive and negative angles of inclination. Variation of mean errors of the studied magnitudes for all test measuring series were analyzed graphically.

W pracy przedstawiona jest nowa metoda pomiaru małych kątów nachylenia, oparta na wykorzystaniu wahadła z przysłoną współpracującą z barierą optoelektroniczną. Załączone są również wyniki badań skonstruowanej aparatury, dotyczące dryftu kąta pochylenia i zmienności okresu wahań wahadła dla dodatnich i ujemnych kątów pochylenia. Zobrazowano też zmienność błędów średnich kąta pochylenia i okresu wahań wahadła dla wszystkich testowych serii pomiarowych.