Thermodynamic properties and thermoelastic behavior of the alternating terpolymers of ethene, propene, and carbon monoxide in the melt state

摘要

Alternating terpolymers of propene or ethene (Et) and carbon monoxide (CO) with four different Et/CO ratios were characterized by measurements of specific Volumes in the temperature interval 286-423 K and in the pressure range 30-100 MPa. Thermodynamic properties of terpolymers in the equilibrium melt state (such as specific volumes, thermal expansivities, and compressibilities) tended to decrease, the higher the Et/CO ratio. Among three different theoretical models of the polymer melt state, the Simha-Somcynsky hole model proved superior in fitting the experimental P-V-T data over the entire ranges of temperatures and pressures. All characteristic parameters of this model exhibited a systematic trend to increase, the higher the Et/CO ratio. No systematic change with chemical composition could be detected for the thermophysical parameters (specific heat capacity, thermal diffusivity, and thermal conductivity) of terpolymers in the melt state. [References: 26]