Bristow-Watson

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

BIO, Bristow, G. M., and W. F. Watson Viscosity-equilibrium swelling correlations for natural rubber cohesive energy densities of polymers. Part 2. Cohesive energy densities from viscosity measurements. Trans. Faraday Soc. 54, 1567, 1742 (1958). 

Bristow MR, Gilbert EM, O Connell JB, Renlund DG, Watson FS, Hammond E, Lee RG, Menlove R. OKT3 monoclonal antibody in heart transplantation. Am J Kidney Dis 1988 11 135-40. 

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). 

Bristow and Watson reportedthe following data at 25 C fora 1 39 copolymer ofacrylonihile and butadiene. 

From Bristow and Watson, Trans. Faraday Soc., 54, 1731, 1958. With permission. 

Figure 6-1. Influence of goodness of solvent, as measured by the solubility parameter, 6i, of the solvent, on the intrinsic viscosity. [17], of dissolved natural rubber and on the volume fraction, 02, of the cross-linked natural rubber polymer in aliphatic hydrocarbons, (O), long-chain esters, ( ), and long-chain ketones, (O). After data from G. M. Bristow and W. F. Watson. The solubility parameter is given in the traditional physical units.

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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