Electrooptical and dielectric investigations on the conformation and the electrical properties of poly‐γ‐benzyl‐L‐glutamate in mixed solvents
- 1 February 1964
- journal article
- research article
- Published by Wiley in Biopolymers
- Vol. 2 (1) , 91-101
- https://doi.org/10.1002/bip.1964.360020112
Abstract
The dielectric constant and the electric birefringence of poly‐γ‐benzyl‐L‐glutamate in ethylene dichloride–dichloroacetic acid mixtures have been measured as functions of the solvent composition. These properties undergo a marked decrease with the addition of a small amount of dichloroacetic acid, as well as an abrupt change accompanying the helix‐coil transition in the vicinity of 75 vol.‐% dichloroacetic acid. The former is attributed to the apparent diminution of the dipole moment of helical poly‐γ‐benzyl‐L‐glutamate molecule, which may be due to the protonation of terminal amide groups.Keywords
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