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Dielectric study on molecular motions of poly(glutamic acid) in aqueous solution over a frequency range of 105-1010 Hz

Dielectric relaxation measurements over an extremely wide frequency region from 100 MHz to 20 GHz were performed on poly(glutamic acid) in dilute aqueous solution at 25 o C. Three relaxation peaks could be found. The high frequency peak around 10 GHz could be easily due to orientation of water molecules, and the intermediate one around 100 MHz could be assigned to a micro-Brownian motion of the main chain. The relaxation strength of the intermediate process is proportional to f c 4.9 , where f c is the fraction of coil