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|Author(s):||J R. Maurey; William R. Blair; Carl R. Schultesiz;|
|Title:||Certification of the Relative Molecular Mass and the Intrinsic Viscosity of SRM 2887, a Polyethylene of Narrow Molecular Mass Distribution|
|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|
|Keywords:||certification,limiting viscosity number,molecular mass,narrow fraction,polydispersity index,polyethylene,standard reference material|
|Research Areas:||Polymers, Measurement Standards|