Pjch. Cools et al., DETERMINATION OF THE CHEMICAL-COMPOSITION DISTRIBUTION OF COPOLYMERS OF STYRENE AND BUTADIENE BY GRADIENT POLYMER ELUTION CHROMATOGRAPHY, Journal of chromatography, 736(1-2), 1996, pp. 125-130
Citations number
7
Categorie Soggetti
Chemistry Analytical","Biochemical Research Methods
In order to determine the chemical composition distribution (CCD) of s
tyrene-butadiene copolymers, gradient polymer elution chromatography h
as been performed. The separation is mainly based on differences in so
lubility among the copolymer molecules with different chemical composi
tion. The solubility of a copolymer is dependent on the following para
meters: temperature, type of solvent/non-solvent mixture, molecular ma
ss of the polymer and the chemical composition of the polymer. The res
olution of the gradient polymer elution chromatographic separation and
the molecular mass dependency are influenced by the solvent/non-solve
nt combination. In order to obtain a reliable separation according to
chemical composition, the differences in solubility must be sufficient
ly high and the molecular mass dependence must be negligible. In order
to separate styrene-butadiene copolymers, synthesized by emulsion pol
ymerization, a tetrahydrofuran-acetonitrile gradient was used. After c
alibration of the chromatographic system with styrene-butadiene copoly
mer standards, the CCD of styrene-butadiene copolymers could be calcul
ated.