Electrooptical and dielectric investigations on the conformation and the electrical properties of poly-γ-benzyl-L-glutamate in mixed solvents

✍ Scribed by Hiroshi Watanabe; Koshiro Yoshioka; Akiyoshi Wada

• Publisher: Wiley (John Wiley & Sons)
• Year: 1964
• Tongue: English
• Weight: 474 KB
• Volume: 2
• Category: Article
• ISSN: 0006-3525
• DOI: 10.1002/bip.1964.360020112

✦ Synopsis

The dielectric constant and the electric birefringence of poly-7-benzyl-L-glutamate in ethylene dichloride-dichloroacetic acid mixtures have been measured aa functions of the solvent composition. Thew properties undergo a marked decrease with the addition of a small amount of dichloroacetic acid, aa well aa an abrupt change accompanying the helix-coil transition in the vicinity of 75 vol.-% dichloroacetic acid. The former is at- tributed to the apparent diminution of the dipole moment of helical poly-7-benzyl-lr glutamate molecule, which may be due to the protonation of terminal amide groups.