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6607357 
Journal Article 
Determination of compositional heterogeneities for acrylonitrile-styrene copolymers by thin-layer chromatography 
Walchli, J; Miyamoto, T; Inagaki, H 
1978 
56 
2 
80-88 
INSPEC:1313535 
Thin-layer chromatography was applied for determining the compositional heterogeneity of acrylonitrile-styrene (AS) copolymer systems. Good separation according to the composition was achieved by a concentration-gradient development with a binary tetrachloroethane+ethyl acetate. A compositional distribution thus found for a radically prepared high-conversion AS copolymer with an AN-content lower than the azeotropic composition was in good agreement with that calculated from copolymerization kinetics assuming the terminal model. While, a bimodal compositional distribution was obtained for a commercial AS copolymer product which had a higher AN-content than the azeotropic composition.