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Cis-trans isomerization of aromatic azo compounds built in the polyester segment of poly(ester urethanes)

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Summary

The photochemical and thermal cis-trans isomerization of 4,4 -(diamido)azobenzene derivative built in the polyester segment of a segmented poly(ester urethane) has been investigated.

The photoisomerization in bulk proceeds more slowly than in solution and lower fractions of cis-isomers are reached in the photostationary state. The thermal cis-trans isomerization follows first order kinetics in polymers with amorphous soft phase but can only be described by two simultaneous first order processes in annealed samples. This is attributed to restrictions in the chain segmental mobility; it is assumed that the isomerization behaviour reflects different molecular motions in the bulk polymer.

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Authors and Affiliations

  1. Institut für Makromolekulare Chemie der Albert-Ludwigs-Universität, Hermann-Staudinger-Haus, Stefan-Meier-Straße 31, 7800, Freiburg i. Br., Germany

    Claus D. Eisenbach

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  1. Claus D. Eisenbach
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Additional information

The author greatfully acknowledges financial support by Die Deutsche Forschungsgemeinschaft and wants to thank Dipl.Chem. B. Reck for the preparation of the polymers.

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Eisenbach, C.D. Cis-trans isomerization of aromatic azo compounds built in the polyester segment of poly(ester urethanes). Polymer Bulletin 1, 517–522 (1979). https://doi.org/10.1007/BF00255717

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  • DOI: https://doi.org/10.1007/BF00255717

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