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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
Author(s) -
Malihi Farrokh B.,
Kuo ChengYih,
Provder Theodore
Publication year - 1984
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1984.070290320
Subject(s) - tetrahydrofuran , copolymer , molar mass distribution , styrene , polymer chemistry , solvent , dimethylformamide , gel permeation chromatography , materials science , toluene , light scattering , analytical chemistry (journal) , emulsion , chemistry , scattering , polymer , chromatography , organic chemistry , optics , composite material , physics
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.