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Determination of the absolute molecular weight of a styrene–butyl acrylate emulsion copolymer by low‐angle laser light scattering (LALLS) and GPC/LALLS

1984; Wiley; Volume: 29; Issue: 3 Linguagem: Inglês

10.1002/app.1984.070290320

1097-4628

Farrokh B. Malihi, Cheng‐Yih Kuo, Theodore Provder,

Analytical Chemistry and Sensors

Abstract The application of low‐angle laser light scattering (LALLS) and combined GPC/LALLS for the measurement of absolute molecular weight distribution of a styrene–butylacrylate (30/70) emulsion copolymer is discussed. From the static light scattering measurements in four different solvents, i.e., toluene, tetrahydrofuran (THF), methyl ethyl ketone (MEK), and dimethylformamide (DMF), the true weight average molecular weight ( M w ) and heterogeneity parameters are determined. The apparent M w obtained from the static measurement in THF was in good agreement with the M w determined from the multiple solvent analysis, suggesting the validity of using THF as the mobile phase in the combined GPC/LALLS analysis.