Abstract
A series of A–B–A tri-block copolymers consisting of the D,L-isomers of poly(γ-benzyl glutamate) and poly(γ-methyl glutamate) as the A component, and polybutadiene as the B component were synthesized. The helical content of the D,L-copolymers in a helicogenic solvent and in a solid state was estimated on the basis of optical rotatory dispersion and infrared spectra. The content of the right-handed α-helix, the left-handed a-helix, and random coil conformations of the polypeptide chains was estimated. From wide-angle X-ray diffraction measurements, it was shown that the hexagonal crystalline phase almost disappeared for D,L-copolymer membranes, indicating a breakdown of the α-helical conformation in the main chains. The microheterophase structure of these block copolymer membranes was studied with an electron microscope and the D,L-block copolymers membranes were found to take on spherical structures even when the volume fractions of the B portion were rather high.
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Hayashi, T., Chen, GW. & Nakajima, A. Synthesis and Structural Study of the A–B–A Tri-Block Copolymer Consisting of Poly(γ-benzyl D,L-glutamate) or Poly(γ-methyl D,L-glutamate) as the A Component and Polybutadiene as the B Component. Polym J 16, 739–749 (1984). https://doi.org/10.1295/polymj.16.739
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DOI: https://doi.org/10.1295/polymj.16.739