Certification of the Relative Molecular Mass and the Limiting Viscosity of SRM 2885, a Polyethylene of Narrow Molecular Mass Distribution

Published

January 1, 2000

Author(s)

Charles M. Guttman, J R. Maurey, William R. Blair

Abstract

The certification of a polyethylene standard reference material, SRM 2885, is described. The Mw of SRM 2885 by light scattering was determined to be 6.28 x 10⁺³ g/mol with a sample standard deviation of 0.39 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. The limiting viscosity number of SRM 2885, by solution viscosity, in 1,2,4-trichlorobenzene was determined to be 24.6 mL/g with a sample standard deviation of 0.45 mL/g. The expanded uncertainty on the mean value was 0.45 mL/g. A combined expanded uncertainty for this limiting viscosity number determination, including systematic and random uncertainties, was 0.48 mL/g. The bottle-to-bottle variation of the SRM was checked by size exclusion chromatography (SEC) and found to be negligible.

Citation

NIST Interagency/Internal Report (NISTIR) - 6454

Report Number

6454

Volume

41(1)

NIST Pub Series

NIST Interagency/Internal Report (NISTIR)

Pub Type

NIST Pubs

Download Paper

https://doi.org/10.6028/NIST.IR.6454

Local Download

Keywords

certification, limiting viscosity number, molecular mass, narrow fraction, polydispersity index, polyethylene, standard reference material

Citation

Guttman, C. , Maurey, J. and Blair, W. (2000), Certification of the Relative Molecular Mass and the Limiting Viscosity of SRM 2885, a Polyethylene of Narrow Molecular Mass Distribution, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.IR.6454, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851675 (Accessed October 14, 2024)