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The physical and even the chemical properties of a polymer in a final manufactured product can be closely related to the polymer structure.

Types of polymer structure:

  • Linear
  • Random branched
  • Comb structure
  • Starburst polymers or dendrimers
  • Copolymers
  • Cross-linked

Multi-detector SEC, such as the TDA, can be used to determine a number of the factors that determine structure:

  • Branching ratio
  • Branching frequency
  • Molecular density / Intrinsic Viscosity
  • Copolymer composition
  • Backbone modification

Structure is determined using a combination of an intrinsic viscosity detector that is sensitive to density, and a light scattering detector that provides molecular weight. These parameters are used to construct a Mark – Houwink plot from which a range of structural information can be deduced.

Application example:
Acrylonitrile-butadiene copolymers, commonly called nitrile rubbers (NBR), are used widely for adhesive compounding, and gloves used for examination and cleaning.

The composition of the copolymers, the polymer cross-linking and branching as well as the molecular weight of NBR affect the macroscopic properties of NBR such as flexibility and puncture resistance.

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Size Exclusion Chromatography, Static Light Scattering, Gel Permeation Chromatography
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Introducing the most advanced GPC/SEC system available: OMNISEC Technical Note (English)

Here we describe the features and benefits of the OMNISEC GPC/SEC system and explain how OMNISEC sets a new standard in molecular characterization.



Combined DLS/Raman provides New Molecular Insights of Complex Fluids Article (English)

In particular, this article demonstrates the correlation between molecular changes (Raman Spectroscopy) and microstructural evolution of rheological properties (DLS, DLS-optical microrheology) for the first time for surfactant-based wormlike micellar...



Size Exclusion Chromatography / Gel Permeation Chromatography: An Introduction in 30 Minutes Whitepaper (English)

GPC/SEC is mainly used for the characterization of macromolecules including synthetic and natural polymers (including polysaccharides) as well as proteins or RNA/DNA. This white paper provides an introduction to the technique in 30 minutes.



Overcoming challenges in the detection and characterization of PLGA using the latest developments in GPC/SEC technology Poster (English)

PLA, PLGA and their copolymers are biocompatible, biodegradable and used in a number of medical applications. However, analysis of this low molecular weight and low dn/dc sample pushes the sensitivity boundaries of all previous light scattering detec...


Keywords: Polymer solutions English Poster Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography OMNISEC 

Using GPC/SEC for excipient characterization Article (English)

The properties of polymeric excipients can directly affect the clinical efficacy, safety, and quality of a finished pharmaceutical product and are routinely identified as critical quality attributes (CQAs). This article looks at how gel permeation/si...


Keywords: English Article Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Biological drug characterization and development Drug discovery Excipients and coatings OMNISEC 
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