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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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20°C to 65°C
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Size Exclusion Chromatography, Static Light Scattering, Gel Permeation Chromatography
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Viscotek range The leading multi-detector GPC/SEC systems and detectors. Image
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Multi-detection GPC/SEC research papers: Top 3 by industry Technical Note (English)

A summary of the three top academic research papers covering different research topics which show how multi-detector GPC/SEC can be used for different applications.


Keywords: English Technical Note Viscotek range Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography 

Anaysis of PLGA Molecular Weight and Structure by the latest Adavanced Multi-Detector GPC Systems Poster (English)

Different samples of commercially available PLGA were analyzed to compare their absolute molecular weight from light scattering to those quoted with the product. Additionally, the Mark-Houwink plots of different examples containing different ratios o...


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

Characterizing polymers: Techniques for the measurement of molecular weight, molecular size and branching. Whitepaper (English)

A review of the methods available for measuring the key characteristics of polymers focusing on the benefits and value of gel permeation/size exclusion chromatography (GPC/SEC). Much of the paper talks exclusively about polymers, however many of the ...


Keywords: Polymer solutions English Whitepaper Zetasizer range Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Polymers, plastics and rubbers Adhesives and sealants Paints, inks and coatings Food additives Polysaccharides OMNISEC 

Compositional insights for protein mixtures: a case study of a semi-pure β-amylase extract Application Note (English)

In this application note, we describe the analysis of a semi-purified protein mixture containing β-amylase.  Step-by-step, we show how different properties of the proteins elicit a specific response in each detector and how the coupling this data can...


Keywords: English Application Note Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Protein aggregation Proteins Biopharmaceutical development OMNISEC 

Structural elucidation of dextrans and other polysaccharides using OMNISEC Multi-Detection GPC Application Note (English)

A series of dextran samples ranging in molecular weight from about 1– 650 kDa are characterized using OMNISEC. Structural comparisons to other polysaccharides, gum arabic and pectin are presented


Keywords: Polymer solutions English Application Note Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Polymers from renewable sources Polysaccharides OMNISEC 
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