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Comparative Study of SEC and AF4 in the Characterization of Organic Soluble Synthetic Polymers
Year: 2022
Type of publication: článek v odborném periodiku
Name of source: Chromatographia
Publisher name: Springer
Place: Heidelberg
Page from-to: nestránkováno
Titles:
Language Name Abstract Keywords
cze Srovnávací studie SEC a AF4 pro charakterizaci polymerů rozpustných v organických rozpouštědlech Syntetické polymery používané při různých technických aplikacích vyly analyzovány frakcionací tokem a asymetrickém tokovém poli (AF4) a rozměrově vylučovací chromatografií (SEC) a výsledky byly porovnány z hlediska rozlišení obou technik a schopnosti stanovit molárně hmotnostní distribuci. Rozměrově vylučovací chromatografie; frakcionace tokem v symetrickém tokovém poli; víceúhlový rozptyl světla; syntetické polymery
eng Comparative Study of SEC and AF4 in the Characterization of Organic Soluble Synthetic Polymers Synthetic polymers used in various technical applications were analyzed by asymmetric flow field flow fractionation (AF4) and size exclusion chromatography size exclusion without dash is more frequent (SEC) followed by a multi-angle light scattering (MALS) photometer and the results were compared from the view point of the resolution of the two methods and their ability to determine the molar mass distribution. The analyzed polymers covered broad molar mass range and included linear, randomly branched and star-shaped molecular topologies. Narrow polystyrene standards were used to determine the molar mass dependence of the efficiency. The number-average molar masses obtained by SEC-MALS were systematically lower compared to those from AF4-MALS with the exception of highly branched polymers, whereas the weight-averages and z-averages were well consistent except for polymers containing ultra-high molar mass fractions undergoing shear degradation in SEC columns. The number of theoretical plates in AF4 was molar mass-dependent as predicted by the theory. Using linear cross flow decay, the molar mass dependence of the AF4 selectivity showed an arc-shaped pattern. The AF4 mass recovery was close to 100% for all samples not containing molecules below the cut-off of the channel membrane. Size exclusion chromatography; Asymmetric flow field flow fractionation; Multi-angle light scattering; Synthetic polymers

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