Accession Number : AD0480014
Title : MEASUREMENT OF VISCOELASTIC PROPERTIES OF DILUTE AQUEOUS POLYETHYLENE OXIDE SOLUTIONS USING ACOUSTIC METHODS.
Descriptive Note : Master's thesis,
Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Personal Author(s) : Chester, Scott A.
Report Date : 1964
Pagination or Media Count : 43
Abstract : The absorption coefficient and the velocity of longitudinal ultrasonic waves in aqueous polyethylene-oxide solutions at 0.025, 0.05, 0.1, 0.25 and 0.375% concentration by wt. were measured at 10.1, 17.9 and 26.1 mc/sec at 23 C. using a pulse technique and were found to be the same as in water at these frequencies and temperature. A new method, involving use of a pulsed, Y-cut, quartz crystal, for the measurement of shear resistance of low viscosity solutions was developed. This method was used to determine, in accordance with relaxation theory, the shear moduli of the polymer solutions at 7 mc/s at temperatures of 4 C., 23 C. and 43 C. These solutions displayed shear moduli at 4 C. of two orders of magnitude greater than those determined at 23 C. and 43 C. The large discrepancy in values measured at 4 C. compared with those measured at the other two temperatures is discussed. (Author)
Descriptors : *VISCOELASTICITY), (*POLYETHYLENE PLASTICS, (*FLUID MECHANICS, POLYMERS), SOUND TRANSMISSION, ULTRASONIC RADIATION, ABSORPTION, SOLUTIONS(MIXTURES), SHEAR STRESSES, TEMPERATURE, MEASUREMENT, TRANSDUCERS, QUARTZ, OSCILLATORS, VISCOSITY, RELAXATION TIME, EQUATIONS.
Subject Categories : Acoustics
Distribution Statement : APPROVED FOR PUBLIC RELEASE