Premium
Liquid‐crystalline structure of poly( L ‐lysine) containing azobenzene units in the side chain
Author(s) -
Gallot Bernard,
Fafiotte Marc,
Fissi Adriano,
Pieroni Osvaldo
Publication year - 1996
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.1996.030170801
Subject(s) - azobenzene , side chain , antiparallel (mathematics) , lysine , polymer , crystallography , diffraction , materials science , chain (unit) , chemistry , polymer chemistry , stereochemistry , organic chemistry , optics , amino acid , physics , biochemistry , quantum mechanics , magnetic field , astronomy
The structure of poly( L ‐lysine) containing 44% azobenzene units in the side chain was studied by X‐ray diffraction between room temperature and 150°C. The polymer exhibits a mesomorphic structure of the smectic A1 type. In this structure, stable at least until 150°C, each smectic layer of thickness d results from the superposition of two layers: one of thickness d A contains the free lysine side chains, the other of thickness d B contains the azobenzene modified lysine side chains and the polypeptide main chains, that in their planes are arranged as in the “antiparallel” β‐structure classical for polypeptides.