Quantitative Mass Spectrometry and Polydisperse Materials: Creation of an Absolute Molecular Mass Distribution Polymer Standard

The certification of an absolute molecular mass distribution polymer Standard Reference Material is described. SRM 2881 is an n-octyl-initiated, proton-terminated, narrow polydispersity, low mass, atactic polystyrene. The absolute molecular mass distribution (MMD) was obtained by matrix-assisted las...

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Bibliographic Details
Published in:Macromolecules 2009-03, Vol.42 (5), p.1695-1702
Main Authors: Guttman, Charles M, Flynn, Kathleen M, Wallace, William E, Kearsley, Anthony J
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
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Summary:The certification of an absolute molecular mass distribution polymer Standard Reference Material is described. SRM 2881 is an n-octyl-initiated, proton-terminated, narrow polydispersity, low mass, atactic polystyrene. The absolute molecular mass distribution (MMD) was obtained by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI−TOF MS). A new Taylor’s expansion method for signal-axis intensity calibration of polydisperse materials is described in detail. The certification includes estimates of uncertainties, both type A (random) and type B (systematic), for each oligomer in the sample having a concentration of at least 0.20% of the total of all oligomers on the low mass tail of the MMD and 0.34% on the high mass tail. Type A uncertainty arising from the MALDI sample preparation was found to be the greatest contributor to the overall uncertainty of the measurement.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma802199r