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Thermodynamics of polyacenaphthylene between 0 and 340 K

Authors
Journal
Thermochimica Acta
0040-6031
Publisher
Elsevier
Publication Date
Volume
327
Identifiers
DOI: 10.1016/s0040-6031(98)00656-x
Keywords
  • Polyacenaphthylene
  • Thermodynamic Functions
  • Enthalpy
  • Entropy
  • Gibbs Energy
Disciplines
  • Chemistry
  • Physics

Abstract

Abstract The heat capacity C 0 p of glassy polyacenaphthylene has been determined using an adiabatic vacuum calorimeter between 6 and 338 K within about 0.2%. From the experimental data the thermodynamic functions C 0 p ( T), H 0( T)− H 0(0), S 0( T)− S 0(0), G 0( T)− H 0(0) have been calculated over the range from 0 to 340 K. From literature data on the enthalpy of formation Δ f H 0 and the absolute entropy S 0( T) of the polymer obtained in the present work, the thermochemical characteristics for reaction of formation (entropy Δ f S 0, Gibbs energy Δ f G 0 and logarithm of thermodynamic equilibrium constant lg K 0 f ) of polyacenaphthylene in a glassy state from simple substances at T=298.15 K and standard pressure have been estimated. The results and the proper data for acenaphthylene have been used to calculate the thermodynamic quantities associated with polymerization of acenaphthylene Δ pol H 0( T), Δ pol S 0( T), Δ pol G 0( T) into polyacenaphthylene from 0 to 340 K and of dehydrogenation of acenaphthene Δ dehydr H 0( T), Δ dehydr S 0( T), Δ dehydr G 0( T) to acenaphthylene in the range from 0 to 350 K. The ceiling temperature T 0 ceil of the polymerization process of acenaphthylene has been estimated.

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