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>Compositional variation as a function of elution volume in gel permeation chromatography of copolymers and physical blends
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Compositional variation as a function of elution volume in gel permeation chromatography of copolymers and physical blends
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机译：Compositional variation as a function of elution volume in gel permeation chromatography of copolymers and physical blends
AbstractThis paper is concerned with the theoretical aspects of the gel permeation chromatography of copolymers and physical blends, such as polypropylene homopolymer and copolymers. Such considerations have become important with the advent of modern UV and IR chromatographic detectors. The behavior of the compositional variation observed as a function of elution volume is investigated by a simulation technique. As an example, ethylene–propylene copolymers having a bivariate normal distribution for molecular weight and composition are taken for calculations. We deal with the effects of the molecular weight distribution, the compositional distribution, and the correlation coefficient between molecular weight and composition on the detected compositional variation. It is concluded that these three factors are equally important in evaluating the curves fo the variation. Therefore, the difference between compositional distributions of copolymers is detectable only under limited conditions where the other factors are kept constan
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