Jump to main content
Jump to site search


Low-field 1H-NMR spectroscopy for compositional analysis of multicomponent polymer systems

Author affiliations

Abstract

The accurate characterization of relative composition in multicomponent polymer systems such as statistical copolymers, block copolymers, and polymer blends is critical to understanding and predicting their behavior. Typically, polymer compositional analysis is performed using 1H Nuclear Magnetic Resonance (NMR) Spectroscopy which provides quantitative chemical group concentrations without prior calibration. This utility has led 1H NMR spectroscopy to become a routine method for the molecular characterization of polymers. Unfortunately, due to cost constraints, NMR spectroscopy is rarely used for routine materials verification such as quality control in industrial settings that commonly lack on-site advanced instrumentation facilities. Recently, low-field or so-called benchtop NMR spectrometers have been introduced commercially as a less expensive alternative to higher field, and costlier, NMR spectrometers. Here, we examine the capability of a low-field 1H NMR spectrometer (60 MHz) for the compositional analysis of select block copolymers and polymer blends by direct comparison with results obtained using a 400 MHz NMR spectrometer. In the analysis of high 1,4-content polyisoprene we find quantitative agreement between the 400 and 60 MHz spectrometers. Furthermore, quantitative agreement is demonstrated for compositional analysis of commercially available poly(styrene-b-isoprene-b-styrene) (SIS) and poly(styrene-b-butadiene-b-styrene) (SBS) triblock copolymers and polymer blends of polystyrene/polyisoprene (PS/PI) and polystyrene/poly(methyl methacrylate) (PS/PMMA) that also serve as proxies for statistical and block copolymer analysis. Overall, we find low-field 1H NMR spectroscopy to be an accessible, powerful and useful tool for polymer characterization.

Graphical abstract: Low-field 1H-NMR spectroscopy for compositional analysis of multicomponent polymer systems

Back to tab navigation

Supplementary files

Publication details

The article was received on 18 Sep 2018, accepted on 12 Jan 2019 and first published on 14 Jan 2019


Article type: Paper
DOI: 10.1039/C8AN01810C
Citation: Analyst, 2019, Advance Article

  •   Request permissions

    Low-field 1H-NMR spectroscopy for compositional analysis of multicomponent polymer systems

    S. B. Chakrapani, M. J. Minkler and B. S. Beckingham, Analyst, 2019, Advance Article , DOI: 10.1039/C8AN01810C

Search articles by author

Spotlight

Advertisements