THERMODYNAMICS OF ENDO-DICYCLOPENTADIENES AND EXO-DICYCLOPENTADIENES,THEIR METATHESIS AND ADDITION POLYMERIZATIONS, AND THE RESULTING POLYMERS

Using the data of precise calorimetry, the temperature dependences of the heat capacities of exo-dicyclopentadiene and the polymers of exo- and endo-dicyclopentadienes prepared by polymerization Of the correspo nding isomers with the metathesis ind addition polymerization catalyst s in the temperature range 6-500 K were studied; the energies of combu stion of the above compounds were determined at 298.15 K-and at standa rd pressure. On the basis of the experimental data, their thermodynami c functions H degrees(T)-H degrees(0), S degrees(T), G degrees(T)-H de grees(0) in the range 0-500 K, the enthalpies of combustion Delta H-c degrees, and the thermochemical parameters of formation Delta H-f degr ees, Delta S-f degrees, and Delta G(f) degrees were calculated. The ob tained data were used to calculate the enthalpies Delta H-p degrees (T ), entropies Delta S-p degrees (T), and the Gibbs function Delta G(p) degrees (T) for the bulk polymerization of exo- and endo-dicyclopentad ienes proceeding via the metathesis and addition mechanisms in the tem perature range 0-320 K, and the upper critical temperatures of polymer ization were estimated.