Bristow-Watson method

The Bristow-Watson method is based on the Huggins equation deduced from a refinement of the lattice approach ... 

The method of DiPaola-Baranyi and Guillet is an extension of the work of Bristow and Watson [21] who calculated solubility parameters for a series of network polymers from swelling equilibria. The basis is that the solubility parameters of solvent, 61, and polymer, 2) are introduced in the form of Regular Solution theory [19] to account for enthalpic effects ... 

Published values for the interaction parameters vary. Bristow and Watson (6) reported the value 0.43 for PS in toluene, and Boyer and Spencer (7) gave the value 0.424 for PS in S. Hild et al. (8) obtained the value 0.45 + 0.9 v2 for model crosslinked PS networks in benzene. Our mean value for PS in S, 0.49, is in this range our method, however, does not require an estimate of crosslink density. Scott and Magat (9) reported the value 0.30 for PBD with toluene, which is close to our mean value for PBD with S (0.29). 

In the first variant of calculation, a classical method based on the solubility parameter concept, was used with application of Bristow and Watson s semi-empirical relationship forx, ... 

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