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8330150 
Journal Article 
Characterization of styrene-acrylonitrile copolymers by size exclusion chromatography / stepwise gradient elution - Liquid precipitation chromatography 
Mori, S 
1996 
Yes 
International Journal of Polymer Analysis & Characterization
ISSN: 1023-666X 
Taylor and Francis Inc. 
2 
2 
185-192 
English 
Styrene-acrylonitrile copolymer having acrylonitrile (AN) content of 19.4% was fractionated first by size exclusion chromatography (SEC) and SEC fractions were then separated by liquid precipitation chromatography (LPC), followed by SEC (SEC-LPC-SEC). LPC was performed by stepwise gradient elution with an octadecylsilane (ODS) silica column and mobile phase of mixtures of n-hexane and chloroform in which the chloroform content in the mobile phase was increased 2% every 5 min. The copolymer was separated by LPC according to both composition and molecular weight (MW); fractions having higher AN content had higher MW. The hyphenated technique of SEC-LPC-SEC gave detailed information in which the first SEC fractions having higher MW had lower AN content. In the same SEC fraction, the LPC fractions having higher MW had higher AN content. 
Chemical composition distribution; Liquid precipitation chromatography; Molecular weight distribution; Size exclusion chromatography; Stepwise gradient elution; Styrene-acrylonitrile copolymer