A multidimensional fractionation protocol for the oligomer analysis of oxidized waxes

Recent Developments in Two-Dimensional Liquid Chromatography: Fundamental Improvements for Practical Applications

“…Ndiripo and Pasch used high-temperature LC × SEC to characterize oxidized waxes at 140 °C. 207 A porous-graphitic-carbon column and a gradient from n -decane to o -dichlorobenzene were used in the first dimension. The latter solvent was also used for the second-dimension SEC separation.…”

“…High temperatures are typically required to resolve poly olefins (including ubiquitous polymers, such as poly ethene, PE, and polypropene, PP). Ndiripo and Pasch used high-temperature LC × SEC to characterize oxidized waxes at 140 °C . A porous-graphitic-carbon column and a gradient from n -decane to o -dichlorobenzene were used in the first dimension.…”

Multidimensional analytical protocols for the fractionation and analysis of complex polyolefins

“…More examples of HT-2D-HPLC are given in Refs. [104][105][106][107][108][109][110][111][112][113][114][115][116][117][118][119][120].…”

Recent Advances in Separation-Based Techniques for Synthetic Polymer Characterization

“…The separation mechanism is based on the adsorption of polymer chains onto the stationary phase, where both enthalpy and entropy contribute to the adsorption according to molecular dynamics simulation with poly­(ethylene-co-hexene) copolymers . Combined with other analytical techniques, HT-TGIC has been used to provide a comprehensive understanding of molecular structures of polymers, such as polymers made by chain walking catalysis, CCD of elastomeric materials, poly­(ethylene-co-octene) copolymers, , and oxidized waxes in adhesive applications. , …”

“…A general trend of research in this field has been in the separations of polymers, waxes and as part of multitechnique analysis of fractionated components from complex polymers. The enhanced resolution for stereoisomers and small molecules on porous graphitic carbon packed columns has been utilized to analyze polypropylene stereoisomers, oxidized waxes, tacticity in poly-1-octenes and high molecular weight fractions in Jet and diesel fuels . Standard HTLC routines have been adapted to analyze poly­(ethylene-co-propylene) elastomers, carboxylic acid–functionalized PE, poly­(ethylene-co–vinyl acetate) copolymers, heterogeneity in chain walking PE and to investigate changes in the microstructure of heterophasic poly­(ethylene-co-propylene)­s with increasing ethylene content, before and after visbreaking .…”