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TU Berlin

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The Influence Of Substituents On The Orientational Behavior Of Novel Azobenzene Side-Chain Polyesters
Zitatschlüssel ZEBGER1995
Autor ZEBGER, I. and KULINNA, C. and SIESLER, H. W. and ANDRUZZI, F. and PEDERSEN, M. and RAMANUJAM, P. S. and HVILSTED, S.
Seiten 159–170
Jahr 1995
Journal Macromolecular Symposia
Jahrgang 94
Zusammenfassung A series of new mesogenic azobenzene propanediols with nitro, methoxy, cyano and no substituent have been synthesized and their mesomorphic behaviour mapped. The diols are employed in a melt transesterification with diphenyl tetradecanedioate to produce side-chain polyesters with high molar masses. Diols and polyesters have similar UV-visible spectra reflecting the acceptor character of the substituent. Polarization FTIR spectroscopy has been used to determine the mesogenic order parameter for the polyesters with different substituents at four laser irradiation wavelengths (413, 458, 488 and 515 nm). Diffraction gratings in thin polyester films have been recorded through polarization holography. Cyano and unsubstituted azobenzene polyesters are shown to exhibit the highest diffraction efficiencies on the order of 13%.
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