Portal de Periódicos da CAPES

Thermal properties of ethylene/propylene copolymers

1968; Wiley; Volume: 116; Issue: 1 Linguagem: Inglês

10.1002/macp.1968.021160113

0025-116X

G. A. Clegg, D. R. Gee, Tom Melia,

Phase Equilibria and Thermodynamics

Abstract A precision, adiabatic vacuum calorimeter and a differential scanning calorimeter have been used to measure the heat capacities of eight ethylene/propylene copolymers, containing from 15 to 70 mole‐% propylene, over the temperature range 180 to 450°K. An estimate has been made of heat capacity values values 180°K. The entropy of the amorphous copolymers at 450°K may be represented by the relationship (y = propylene content of the copolymer in mole‐%). The glass transition temperatures of the copolymers lie in the range 210 to 235°K.