Determination of the chemical composition distribution of copolymers of styrene and butadiene by gradient polymer elution chromatography

Abstract

In order to determine the chemical composition distribution (CCD) of styrene-butadiene copolymers, gradient polymer elution chromatography has been performed. The separation is mainly based on differences in solubility among the copolymer molecules with different chemical composition. The solubility of a copolymer is dependent on the following parameters: temperature, type of solvent/non-solvent mixture, molecular mass of the polymer and the chemical composition of the polymer. The resolution of the gradient polymer elution chromatographic separation and the molecular mass dependency are influenced by the solvent/non-solvent combination. In order to obtain a reliable separation according to chemical composition, the differences in solubility must be sufficiently high and the molecular mass dependence must be negligible. In order to separate styrene-butadiene copolymers, synthesized by emulsion polymerization, a tetrahydrofuranacetonitrile gradient was used. After calibration of the chromatographic system with styrene-butadiene copolymer standards, the CCD of styrene-butadiene copolymers could be calculated.

High-temperature gradient HPLC for the separation of polyethylene–polypropylene blends

“…HPLC separations can be achieved via different mechanisms, including adsorptiondesorption and precipitation-redissolution [25,26]. In gradient HPLC, frequently precipitation and adsorption processes are combined [27][28][29][30]. An overview of different techniques and applications involving the combination of SEC and gradient HPLC was published by Glöckner [23].…”

Study on the retention behaviour of low-molar-mass polystyrenes and polyesters in reversed-phase liquid chromatography by evaluation of thermodynamic parameters

“…Introduction the increasing complexity of (co)polymers, gradient elution [1][2][3][4] as well as isocratic [5][6][7] liquid The characterization of synthetic polymers by chromatographic methods have been applied to liquid chromatographic methods differing from sizecharacterize these products according to chemical exclusion chromatography (SEC), has gained considcomposition. Recently we have demonstrated the erable attention during the past decade.…”

Cationic Copolyelectrolytes: Online Monitoring of the Synthesis and Subsequent Copolymer Characterization

“…Experimental approaches to determine important copolymer features controlling many aspects of the polymeric materials behavior, such as the bivariate composition and mass distribution involve usually complementary techniques 25–28…”