On-line SEC/NMR Analysis of Polymers

  • Koichi Hatada
  • Tatsuki Kitayama
Chapter
Part of the Springer Laboratory book series (SPLABORATORY)

Abstract

Recent developments in the sensitivity and resolution of NMR spectrometers have permitted us to use them as a real-time detectors for HPLC as demonstrated in recent review articles [1–4]. SEC is the most widely and frequently used HPLC method for polymer analysis. Recently, we developed an on-line SEC/NMR system in which a 500 or 750 MHz 1H NMR spectrometer was used as a detector [5–13]. By using on-line SEC/NMR the molecular weight of a polymer can be determined without a calibration curve if the polymer sample contains a known amount of end groups per polymer molecule. Data on the molecular-weight dependence of polymer structures, such as copolymer composition and tacticity, are very useful for understanding the mechanism of polymerization or the properties of polymers, and are usually collected by the fractionation of the polymer and the subsequent structural analysis of each fraction. However, this method requires a lot of time and rather a large amount of polymer sample. The on-line SEC/NMR method is very useful for this purpose; it needs only a few hours and a very small amount of sample (0.5–1.0 mg).

Keywords

Toluene Fractionation Oligomer Vinyl Styrene 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2004

Authors and Affiliations

  • Koichi Hatada
    • 1
  • Tatsuki Kitayama
    • 1
  1. 1.Graduate School of Engineering Science Department of ChemistryOsaka UniversityToyonaka OsakaJapan

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