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|Author(s):||Charles M. Guttman; J R. Maurey; William R. Blair;|
|Title:||Certification of the Relative Molecular Mass and the Limiting Viscosity of SRM 2885, a Polyethylene of Narrow Molecular Mass Distribution|
|Published:||January 01, 2000|
|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|
|Keywords:||certification,limiting viscosity number,molecular mass,narrow fraction,polydispersity index,polyethylene,standard reference material|
|Research Areas:||Standard Reference Materials, Polymers|
|PDF version:||Click here to retrieve PDF version of paper (106KB)|