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- W2024644265 abstract "1. Principal peculiarities of thin-layer chromatogrpahy (TLC) of polymers on porous adsorbents have been considered on the basis of the concept that macromolecules are adsorbed as a flexible polymer chain. A dependence relating RF of the polymer to its molecular weight has been suggested. 2. A method for TLC of homopolymers has been used with separation accorrding to the molecular weight and using systems with low and high resolution on silica gels of various porosity. A method for determining the molecular weight distribution of polymers has been worked out. It takes into account chromatographic spreading of polymer fractions by comparison of one- and two-dimensional TLC in one solvent systems. 3. A method of TLC of copolymers according to their composition has been suggested. It may be used for determining their homogeneity. The effect of the molecular weight on the chromatographic distribution of copolymers on plates has been investigated. This effect was found to decrease when silica gel with small pores was used. 4. The concentration dependences in TLC of homopolymers and copolymers have been studied. They were shown to be of the nature of adsorption in the lower part of the plate. In its upper part these dependences are characteristic for gel chromatography when the rate of the movement of macromolecules decreases with the increase in concentration. 5. A method has been worked out for determining homopolymer admixtures in the block and graft copolymers by two-dimensional TLC. Block and graft copolymers were diagnosed by comparing their chromatography mobility with that of the corresponding homopolymers of equal molecular weight." @default.
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- W2024644265 title "Thin-layer chromatography of polymers introductory lecture" @default.
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- W2024644265 doi "https://doi.org/10.1016/s0021-9673(00)86699-6" @default.
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