Certification of the Relative Molecular Mass and the Intrinsic Viscosity of SRM 2887, a Polyethylene of Narrow Molecular Mass Distribution

Published

October 12, 2021

Author(s)

J R. Maurey, William R. Blair, Carl R. Schultesiz

Abstract

The certification of a polyethylene standard reference material, SRM 2887, is described. The Mw of SRM 2887 by light scattering was determined to be 196.4x10+3 g/mol with a sample standard deviation of 6.7 x10+3 g/mol. A combined expanded uncertainty for this light scattering Mw determination, including systematic and random uncertainties, was estimated to be 13.4 x10+3 g/mol. The limiting viscosity number of SRM 2887, by solution viscosity, in 1,2 4-trichlorobenzene was determined to be 273.5 mL/g with a sample standard deviation of 3.7 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 4.0 mL/g. The bottle-to-bottle variation of the SRM was check by size exclusion chromatography (SEC) and found to be negligible.

Citation

NIST Interagency/Internal Report (NISTIR) - 6456

Report Number

6456

NIST Pub Series

NIST Interagency/Internal Report (NISTIR)

Pub Type

NIST Pubs

Keywords

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

Citation

Maurey, J. , Blair, W. and Schultesiz, C. (2021), Certification of the Relative Molecular Mass and the Intrinsic Viscosity of SRM 2887, a Polyethylene of Narrow Molecular Mass Distribution, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD (Accessed April 25, 2024)