Accession Number : AD0737995

Title :   Bulk Modulus of Polyethylene Oxide.

Descriptive Note : Rept. for Jun 70-Jun 71,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Warfield,R. W. ; Hartmann,Bruce

Report Date : 25 JAN 1972

Pagination or Media Count : 26

Abstract : A compressibility pressure-temperature cycle has been developed for polyethylene oxide (PEO) by which both the melting and freezing points of this polymer are easily determined. It was found that PEO supercools about 10^C and that the pressure dependencies of the melting and freezing points are approximately the same. Using the pressure dependence of the bulk modulus for PEO, the Gruneisen constant, was calculated to be about 5 and was found to have an anomalous temperature dependence. It is shown that the Anderson-Gruneisen constant, and the Rao constant, are essentially the same parameter and that Wada's Rule holds for transitions in which the volume does not change. (Author, modified-PL)

Descriptors :   (*PLASTICS, COMPRESSIVE PROPERTIES), ACOUSTIC PROPERTIES, PRESSURE, TEMPERATURE, MELTING POINT, FREEZING, THERMODYNAMICS

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE