What is Chemical Composition Distribution in Polyolefins, and Why it Should It Be Part of Your HT GPC Analysis?

The most discriminating structural property in polymers is missing in your GPC analysis. Resins that seem nearly identical by a standard GPC analysis can only be fully differentiated when adding short chain branching information.

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Event Overview:

Chemical composition distribution (CCD) is a critical dimension for the study of the microstructure of polyolefins, but it is often overlooked because its impact is not widely known. This presentation will explain what short chain branching distribution is, why it is so relevant to understanding the microstructure of a resin, and how it can be obtained. Two approaches for analyzing the CCD will be presented, first by high-temperature GPC-IR, and then by the most powerful techniques based on crystallization and adsorption chromatography: TREF, CRYSTAF, CEF, and TGIC.


Key Learning Objectives:

• Understand what Chemical Composition Distribution is and why it is extremely revealing in polyolefin analysis, especially for LLDPEs and PP copolymers.
• Learn why a standard GPC analysis alone is not capable of obtaining CCD because it is limited to molar mass, which doesn’t discriminate similar microstructures.
• Learn the appropriate methods for obtaining, in addition to molar mass, the comonomer content, and short chain branching (CCD information).

Who Should Attend:

• Chemists, analysts, researchers, and developers of polyolefin products (polypropylene, polyethylene, and other polymers) who perform high temperature GPC analysis and want a more discriminatory technique for complex products.

Speaker

Alberto Ortin
Senior R&D Scientist
Polymer Char

Dr. Alberto Ortin received a Master's Degree in Electronics Engineering at the Polytechnic University of Valencia, Spain. He received his Masters Degree in Analytical Chemistry and his PhD in Chemistry from the University of Valencia.

He is now a scientist at Polymer Char, where he has accumulated 25 years of experience in the development of instruments, software, and detectors for different polyolefin characterization techniques, including GPC, TREF, and cross-fractionation.

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