Abstract
The temperature dependences of the heat capacities of crystalline tetraphenyltetrahydroxycyclotetrasiloxane, octaphenyltetrahydroxytricyclooctasiloxane, and octaphenylpentacyclosilsesquioxane and of glassy polyphenylsilsesquioxane were measured in the range 6-300 K with an adiabatic vacuum calorimeter, with an accuracy of ∼0.3%. From these data, the thermodynamic functions C 0 p (T), H 0(T) - H 0(0), S 0(T) - S 0(0), and G 0(T) - H 0(0) of these substances were calculated for the range 0-300 K. The standard entropies of their formation from elements at 298.15 K, Δ f S 0, and the entropies of mutual transformations of these substances in the range 0-298.15 K were calculated.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call