Certification of a Polystyrene Synthetic Polymer, SRM 2888

Published

November 1, 2003

Author(s)

Charles M. Guttman, William R. Blair, B M. Fanconi, R J. Goldschmidt, William E. Wallace, S Wetzel, David L. VanderHart

Abstract

The certification of a polystyrene standard reference material, SRM 2888, is described. The M_w of SRM 2888 was determined by light scattering to be 7.19 x 10⁺³ g/mol with a sample standard deviation of 0.14 x 10⁺³ g/mol. A combined expanded uncertainty for this light scattering Mw determination, including systematic and random uncertainties, was estimated to be 0.57 x 10⁺³ g/mol. Mn was determined by NMR analysis of the end groups and found to be 7.05 x 10⁺³ g/mol with an estimated expanded uncertainty of 0.55 x 10⁺³ g/mol. Fourier transform infrared spectroscopy (FTIR) and matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF-MS) were used to analyze end groups on the polymer. The polystyrene was analyzed by MALDI-TOF-MS for the number (Mn) and mass (Mw) average of the molecular mass distribution (MMD) as well as the MMD. The bottle-to-bottle variation of the SRM was checked by size exclusion chromatography (SEC) and found to be negligible.This polymer was also used in an interlaboratory comparison of MALDI-TOF-MS of synthetic polymers. The interlaboratory comparison and its results are described. Agreement between the MMD moments obtained by light scattering and NMR and the moments of the MMD obtained by MALDI in the interlaboratory comparison is found to be good overall. However, all the experimental values obtained by MALDI-TOF-MS fell below the classical values.

Citation

Special Publication (NIST SP) - 260-152

Report Number

260-152

Volume

265(2)

NIST Pub Series

Special Publication (NIST SP)

Pub Type

NIST Pubs

Download Paper

https://doi.org/10.6028/NIST.SP.260-152

Local Download

Keywords

MALDI-TOF-MS, SRM, SRM 2888, standard reference material, synthetic polymers

Citation

Guttman, C. , Blair, W. , Fanconi, B. , Goldschmidt, R. , Wallace, W. , Wetzel, S. and VanderHart, D. (2003), Certification of a Polystyrene Synthetic Polymer, SRM 2888, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.SP.260-152, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=852132 (Accessed April 26, 2024)