Presented at the 8th International Conference on Polyolefin Characterization (ICPC), 2023, Valencia, Spain.
By Tonica González, Laura Santonja, Jean Paul Soliva, Benjamín Monrabal. Polymer Char, Valencia, Spain.
Characterization of the Chemical Composition Distribution (CCD) of polyolefins demands a significant attention in the polymer industry. The CCD is the most discriminating parameter, and in most cases the most fundamental microstructure feature. The CCD is being measured by well-established crystallization techniques such as Crystallization Elution Fractionation (CRYSTAF), Temperature Rising Elution Fractionation (TREF) and Crystallization Elution Fractionation (CEF).
Dynamic Crystallization (DC) is a more recent crystallization mode that have been very successful in CEF to enhance the separation. DC performs the separation during cooling like CRYSTAF.
All these techniques separate according to crystallizability and provide a powerful and predictable separation of components based on the presence of branches, irregularities, or tacticity differences independently of the molar mass.
The analyses by TREF, CEF and TGIC can be performed in a CEF instrument commercialized by Polymer Char. CRYSTAF is performed in a dedicated instrument by Polymer Char as well. But could Dynamic Crystallization (DC) as technique deliver results similar to CRYSTAF and in this way perform in the same instrument TREF, CEF, TGIC and DC?
This work is focus on studying different columns. It has been observed the importance of the interstitial volume has. Parameters like tubing internal diameter, length and type and size of packing have been take into account to improve the resolution of the samples analyzed and obtain results similar to CRYSTAF.