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Certification of the Relative Molecular Mass and the Intrinsic Viscosity of SRM 2886, a Polyethylene of Narrow Molecular Mass Distribution

Published

Author(s)

Kathleen M. Flynn, J R. Maurey, William R. Blair

Abstract

The certification of a polyethylene standard reference material, SRM 2886, is described. The Mw of SRM 2886 by light scattering was determined to be 87.0x10+3 g/mol with a sample standard deviation of 2.4 x10+3 g/mol. A combined expanded uncertainty for this light scattering Mw determination including systematic and random uncertainties was estimated to be 6.0 x10+3 g/mol. The limiting viscosity number of SRM 2886 by solution viscosity in 1,2 4-trichlorobenzene was determined to be 154.1 mL/g with a sample standard deviation of 2.5 mL/g. The standard deviation on the mean value was 0.4 mL/g. A combined expanded uncertainty for this limiting viscosity number determination was 2.7 mL/g. The bottle-to-bottle variation of the SRM was check by size exclusion chromatography (SEC) and found to be negligible. A polydisperity index for SRM 2886 of 1.2 was estimated.
Citation
NIST Interagency/Internal Report (NISTIR) - 6487
Report Number
6487

Keywords

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

Citation

Flynn, K. , Maurey, J. and Blair, W. (2000), Certification of the Relative Molecular Mass and the Intrinsic Viscosity of SRM 2886, a Polyethylene of Narrow Molecular Mass Distribution, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD (Accessed June 9, 2023)
Created February 29, 2000, Updated October 12, 2021