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.