Accession Number : AD0269081

Title :   THERMODYNAMIC PROPERTIES OF POLYETHYLENE

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : WARFIELD,R.W. ; PETREE,M.C.

Report Date : 03 AUG 1961

Pagination or Media Count : 15

Abstract : The lack of fundamental data on the properties of polyethylene prompted a study of the available thermodynamic parameters of this material. From published data the entropy, enthalpy, and Gibbs free energy values of conventional high pressure polyethylene were calculated over the range 0 to 315 K. The use of a linear Tarassov function to estimate the specific heat of polyethylene is discussed. The thermodynamic function, Cp/T versus T, has been calculated and exhibits an increase at 60 K. An approximation is made of the number of vibrating units per repeating unit at 273 K. Cp-Cv is calculated at 273 K and found to be 0.082 cal/deg gm. (Author)

Descriptors :   *ETHYLENES, *POLYMERS, *THERMODYNAMICS, ENTHALPY, ENTROPY, THEORY, TRANSITION TEMPERATURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE