The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/macp.201800522.
Bivariate Molecular WeightsThe bivariate molecular weight and chemical composition distribution (MWD×CCD) of ethylene/1-hexene copolymers can be measured using TREF×GPC cross fractionation characterization (CFC). In this work, the experimental MWD×CCD of ethylene/1-hexene copolymers made with a Ziegler-Natta catalyst under different polymerization conditions are measured by CFC and deconvoluted to identify the minimum number of site types present in the catalyst. Blends of ethylene/1-hexene copolymers produced with a metallocene catalyst with known MWD×CCD are used to validate the proposed technique. This is a powerful methodology to better understand the nature of active sites on multisite catalysts, and can be beneficial for the development of copolymers with precisely controlled microstructures.
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