Dow Global Technolgoies LLC

Cherry Hollis

Rongjuan Cong

Albert Parrott

Charles Michael Cheatham

Albert Parrot

A temperature gradient chromatography, and apparatus for the same, said method comprising the following: a) dissolving a composition comprising at least one polymer in at least one solvent, to form a polymer solution; b) injecting at least a portion of the polymer solution onto a support material and wherein the support material has a CI from 0.70 to 1.50; c) cooling the support material at a rate greater than, or equal to, 0.2&#xb0; C./min; d) increasing the temperature of the support material to elute at least some of the polymer; e) generating the chromatogram.

Chromatography of polymers with reduced co-crystallization

A method increase of the Resolution Index (RI) of a chromatogram generated from a polymer sample comprising at least two olefin-based polymers of different microstructures and/or at least two olefin-based polymer fractions of different microstructures. The method comprises separating the mixture on a low-porosity stationary phase and repeatedly cycling the sample-stationary phase through a series of cooling and heating stages with active eluent flow only during the cooling stages and during the last heating stage to elute the separated analytes off the column.

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Cherry Hollis