Excess enthalpies, H-E, of binary mixtures containing poly(propylene glycols) of different molecular masses+ benzyl alcohol, or + m-cresol, or + anisole were determined using a flow microcalorimeter at 308.15 K and at atmospheric pressure. Data was correlated using the Redlich-Kister polynomial. Results were qualitatively discussed in terms of molecular interactions and of the regular solution model. (c) 2005 Elsevier B.V. All rights reserved.