High-Temperature-Size-Exclusion-Chromatography (HT-SEC) has been established as a standard characterization method for polyolefins (PO) for accurate determination of Molecular Weight Distribution (MWD) parameters. However, it is often not sufficient to look only at the standard parameters (Mw, Mn, or PDI) to obtain an accurate picture of the properties of the polyethylene (PE) or polypropylene (PP) at hand. Since Ziegler-Natta-based POs still play an important role, methods have been developed to describe the often rather broad MWDs more precisely. For this purpose, the broad MWD is considered as a blend of different single-site type distributions. In this way, it is possible to look at individual parts of the MWD in more detail.
Our software is based on various publications and application cases are shown in various papers of our group. As an example, the principles are explained in detail in this paper (DOI: 10.1002/mren.202100020, opens an external URL in a new window ). The following picture shows how polymers are analyzed and characterized according to several active sites. The parameters can be adjusted according to the application (free Mn analysis, fixed Mn). In addition, the software is also able to simulate the comonomer content of LLDPE samples accordingly and assign the corresponding comonomer levels to individual active sites.
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