Abstract
The mechanical properties of and the hydraulic permeability of water toward membranes of A–B–A tri-block copolymers consisting of α-helical poly(γ-benzyl L-glutamate) as the A-component and polybutadiene as the B-component, were examined and compared with the same properties of poly(γ-benzyl L-glutamate) membrane. Analysis of the temperature dependence of the dynamic modulus and the loss modulus based on Takayanagi’s mechanical model leads to the conclusion that the dynamic mechanical spectra can be well explained by the micro-heterophase structure observed by electron microscope. The hydraulic permeability K of water for the block copolymer membranes is dramatically higher than that of homopolypeptide, and increases in proportion to the interfacial area between the A and B domains. This fact suggests that the residues near the end of polypeptide chain and the terminal residues of amine-terminated polybutadiene, which locate in the interfacial region between the α-helical A-component and the B-component, are responsible for the water permeability, since NH and CO residues in this region do not form intramolecular hydrogen bonds.
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Nakajima, A., Kugo, K. & Hayashi, T. Mechanical Properties and Water Permeability of A–B–A Tri-Block Copolymer Membranes Consisting of Poly(γ-benzyl L-glutamate) as the A-Component and Polybutadiene as the B-Component. Polym J 11, 995–1001 (1979). https://doi.org/10.1295/polymj.11.995
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DOI: https://doi.org/10.1295/polymj.11.995