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Thermal effects in poly(hexamethylene adipamide) and polyoxymethylene at high hydrostatic pressures
Author(s) -
Rodriguez E. L.,
Filisko F. E.
Publication year - 1987
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1987.070330625
Subject(s) - polyoxymethylene , thermoelastic damping , thermodynamics , hydrostatic pressure , atmospheric temperature range , materials science , adiabatic process , thermal , composite material , polymer , physics
The temperature changes as a result of rapid hydrostatic pressure applications are reported for poly(hexamethylene adipamide) (nylon 66) and poly(oxymethylene) (POM) in the reference temperature range from 298 to 423 K and in the pressure range from 13.8 to 200 MN/m 2 . The adiabatic temperature changes were found to be a function of pressure and temperature. A curve fitting analysis showed that the empirical curve (∂ T /∂ P ) = ab (Δ P ) b −1 described the experimental thermoelastic coefficients obtained from the experiments. The data were analyzed by determining the predicted thermoelastic coefficients derived from the Thomson equation (∂ T /∂ P ) = α T 0 /ρ C p . The experimental and predicted Grüneisen parameter γ T were also determined. The relationship between the thermal effects and the chain molecular motion is discussed by including dynamic mechanical analysis and DSC measurements for the nylon 66 and POM samples.