Abstract
AbstractAn adiabatic calorimeter has been used to measure the heat capacity of paraldehyde from 80 to 310°K. An estimate has been made of heat capacity values below 80°K. Entropy, enthalpy and free energy values have been derived and are listed at 10° intervals. Published vapour pressure data have been used to calculate the entropy of paraldehyde gas at one atmosphere pressure and 298.16°K. The value obtained is 89.50 ± 1.20 cal deg−1 mole−1. The thermal behaviour of paraldehyde in the solid state is complex; transitions occur between four different crystalline forms of paraldehyde at 142.7, 147.5, and 230.3°K, respectively. The melting transition occurs at 285.7°K. The entropies of isotactic and syndiotactic polyacetaldehyde have been estimated as 13.8 ± 0.2 and 17.1 ± 0.2 cal deg−1 mole−1 respectively.
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