The miscibility of poly(styrene) and poly(vinylmethylether) is studied both
by measuring the glass transition temperatures of the mixture and with the
application of the Flory-Prigogine theory in the approximated form due to
Patterson. For these calculations, the enthalpy of mixing of the two polyme
rs is evaluated by measuring the enthalpies of solution of the pure polymer
s and of the mixture. The trend of the interaction parameters with the temp
erature for two samples of poly(styrene) of different molecular weight is d
iscussed. (C) 2001 Elsevier Science B.V. All rights reserved.