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Molar Mass and Microstructure Analysis of PI‐ b‐ PMMA Copolymers by SEC‐NMR
Author(s) -
Hehn Mathias,
Hiller Wolf,
Wagner Thomas,
Thiel Jürgen,
Pasch Harald
Publication year - 2012
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201100645
Subject(s) - molar mass , copolymer , methyl methacrylate , microstructure , size exclusion chromatography , analytical chemistry (journal) , polymer chemistry , molar mass distribution , chemistry , proton nmr , materials science , chromatography , crystallography , organic chemistry , polymer , enzyme
The online coupling of size‐exclusion chromatography and NMR is used to characterize block copolymers consisting of polyisoprene (PI) and poly(methyl methacrylate) (PMMA) regarding their distributions of molar mass (MMD) and chemical composition (CCD). Using the CCD, $\overline{M}_{\rm n}$ and $\overline{M}_{\rm w}$ are calculated on the basis of PI and PMMA homopolymer calibrations. The microstructure distribution of PMMA and the distribution of isomeric units of PI in dependence of molar mass is also demonstrated. Furthermore, a simulation analysis is presented for a bimodal eluting sample. It allows for full separation, quantification and molar mass determination of the coeluting co‐ and homopolymer fractions. The quantification of the fractions is verified by liquid chromatography at critical conditions.