10.1021/ma401429n.s001 Mathias Hehn Mathias Hehn Khumo Maiko Khumo Maiko Harald Pasch Harald Pasch Wolf Hiller Wolf Hiller Online HPLC–NMR: An Efficient Method for the Analysis of PMMA with Respect to Tacticity American Chemical Society 2016 molar mass sample tacticity Several representative blends HPLC method isotactic PMMA show dependences data tacticitie SEC 2016-02-18 17:30:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Online_HPLC_NMR_An_Efficient_Method_for_the_Analysis_of_PMMA_with_Respect_to_Tacticity/2368993 New methods of liquid adsorption chromatography were developed to separate poly­(methyl methacrylate) (PMMA) regarding tacticity and molar mass. Gradient and isocratic chromatographic methods were applied to separate the tactic polymers. In particular, the online coupling of HPLC–NMR was used to identify and quantify the microstructural moieties during the chromatographic separation. It was possible to individually follow the elution of the syndiotactic, heterotactic as well as isotactic patterns. Several representative blends of PMMA samples of different tacticities as well as molar masses were well separated and analyzed. The quantification of all tacticities of the HPLC–NMR measurements was performed and the overall compositions were in good agreement with the data on the bulk samples. In addition, SEC–NMR data of predominantly isotactic PMMA show dependences of the tacticity on the molar mass.