Theory

Theory

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How Molecular Weight Averages are Calculated

Polymers are comprised of a mixture of molecules possessing different molecular weights. This distribution in molecules arises from the polymerization process used to synthesize the polymer...

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How to Measure Branching in Polymer by SEC/GPC

Polymers are comprised of a mixture of molecules possessing different molecular weights. This distribution in molecules arises from the polymerization process used to synthesize the polymer...

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Molecular Characterization of Copolymers and Polymer Blends

The four main chain structures of copolymers comprised of co-monomers A and B include: alternating, block, grafted, and random. Polymer blends will also vary in composition depending on the process employed.

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What is Size Exclusion/Gel Permeation Chromatography (SEC/GPC)?

Size exclusion or gel permeation chromatography (SEC/GPC) is a technique employed to separate complex mixtures of macromolecules according to their hydrodynamic size...

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What is Triple Detection SEC/GPC? The Principles of Light Scattering, Viscometry, and Advanced Detection Calibration

Light Scattering is an absolute technique for the determination of molecular weight of macromolecules. This technique is independent of the column calibration procedure and determines the ABSOLUTE or the TRUE molecular mass DIRECTLY...

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