Accession Number : AD0489091

Title :   INVESTIGATION OF THE ULTRASONIC DYNAMIC VISCOELASTIC PROPERTIES OF AQUEOUS POLYETHYLENE OXIDE SOLUTIONS.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Prather, Robert James, Jr

Report Date : MAY 1966

Pagination or Media Count : 32

Abstract : Some of the viscoelastic properties of aqueous solutions of polyethylene oxide were studied using the method of pulsed torsional wave propagation in the ultrasonic frequency range. Measurements of the changes in attenuation and phase of the wave train in a rod when the rod is immersed in the solutions permit calculation of the components of the complex shear modulus (or the complex viscosity). The results from this study are combined with those of others at different frequencies to obtain a measure of the variation of the viscoelastic properties over a wide frequency range. This can be interpreted qualitatively in terms of a distribution of relaxations at low frequencies corresponding to the configurational relaxation of the molecule as a whole and a relaxation frequency of approximately 40 kHz corresponding to that of the shortest chain segment. The real part of the complex viscosity approaches a value at high frequencies, dependent upon the concentration, which is greater than that of water thus showing the existence of a local viscosity which is dependent upon concentration. (Author)

Descriptors :   *POLYMERS), (*ETHYLENE OXIDE, SOLUTIONS(MIXTURES), VISCOELASTICITY, VERY LOW FREQUENCY, LOW FREQUENCY, SHEAR STRESSES, VELOCITY, TEMPERATURE.

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE