When analyzing HDPE pipe resins, high sensitivity is required to be capable of measuring the low number of branches accurately. IR5 MCT detector was designed for this specific purpose and it is very powerful when characterizing that kind of resins.
By connecting a capillary Viscometer to a high temperature GPC when analyzing polyolefins, the bulk Intrinsic Viscosity (IV) can be determined. The IV is provided as a function of Molar Mass (MM), and then the Universal Calibration (UC) is applied, for samples with different molecular structures.
Besides, if the viscosity results are combined with Light Scattering detector signals, Long Chain Branching results can be obtained too.
A Light Scattering detector connected to a GPC Instrument allows determining the absolute Molar Mass without calibrating the GPC columns.
Besides, the Long Chain Branching results can be obtained as well, if we combine the results from this detector with Viscometer measurements in the same run.
The Light Scattering detector used is the DAWN HELEOS™ II of Wyatt Technology (8 angles).
A Carbonyls sensitive sensor can be incorporated in the infrared detector to measure the C=O/1000C tendency versus the molar mass distribution. (Depending on instrument availability)