Phase Transition Thermodynamics of Bisphenols

• Tipo: Artigo em Revista Científica Internacional
• Data: 2014

Autores

Costa, JCS (Autor) Outra; Juan Z Davalos (Autor) Outra; Luis M N B F Santos (Autor) FCUP

Revista

Título: Journal of Physical Chemistry A

Vol. 118

Páginas: 9712-9719

ISSN: 1089-5639

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 7 Citações

Scopus - 7 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-009-WKD

DOI: 10.1021/jp505404w

Abstract (EN): Herein we have studied, presented, and analyzed the phase equilibria thermodynamics of a bisphenols (BP-A, BP-E, BP-F, BP-AP, and BP-S) series. In particular, the heat capacities, melting temperatures, and vapor pressures at different temperatures as well as the standard enthalpies, entropies, and Gibbs energies of phase transition (fusion and sublimation) were experimentally determined. Also, we have presented the phase diagrams of each bisphenol derivative and investigated the key parameters related to the thermodynamic stability of the condensed phases. When all the bisphenol derivatives are compared at the same conditions, solids BP-AP and BP-S present lower volatilities (higher Gibbs energy of sublimation) and high melting temperatures due to the higher stability of their solid phases. Solids BP-A and BP-F present similar stabilities, whereas BP-E is more volatile. The introduction of -CH3 groups in BP-F (giving BP-E and BP-A) leads an entropic differentiation in the solid phase, whereas in the isotropic liquids the enthalpic and entropic differentiations are negligible.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8