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Influence of polymolecularity on the second virial coefficient of polymers

✍ Scribed by Rolf E. Bareiss; Bernd Jung; Alexei R. Khokhlov

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 279 KB
Volume: 5
Category: Article
ISSN: 1022-1344
DOI: 10.1002/mats.1996.040050112

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✦ Synopsis

Scaling theory is applied to derive expressions describing the influence of polymolecularity on the second virial coefficient, A , , as obtained from osmotic pressure and light scattering measurements. Numerical values of polymolecularity correction factors are calculated for Schulz-Zimm and logarithmic normal distributions of the molecular weight, different qualities of the solvent and several ratios of the weight-average and the numberaverage molecular weights a,,,/&?". It is found that in the equation A , = KA,. Ma: , the weight-average molecular weight is a good approximation for May if A , is measured via light scattering, while the number-average molecular weight can be inserted for May if A , stems from osmotic pressure measurements.

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