Development of Characterization Techniques for Polyurethanes I. Characterizationof SRM 1480, a Low Molecular Weight Polyurethane for SEC Calibration

摘要

The characterization of a polyurethane standard reference material, SRM 1480, isdescribed. The weight average molecular weight of SRM 1480 by light scattering was determined to be 47,000 g/mole. The intrinsic viscosity of SRM 1480 in THF was also measured and found to be 43.8 mL/g. The size exclusion chromatography (SEC) of SRM 1480 in THF as received in the bottle was found to exhibit concentration dependent peak positions, even at low concentrations. The addition of 0.01 moles per liter LiBr to the THF was found to alleviate this problem. This low concentration of LiBr did not change the polystyrene calibration of the SEC columns.