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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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OMNISEC The world’s most advanced multi-detector GPC/SEC system Image
Measurement
Molecular weight, Molecular size, Molecular structure
Temperature range
20°C to 65°C
Technology
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
Measurement
Molecular structure, Molecular weight, Molecular size, Protein aggregation, Rheology and viscosity
Temperature range
25°C to 160°C
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Optimising food additive choice: Exploring the value of recent advances in SEC technology Article (English)

State-of-the-art GPC/SEC systems, such as OMNISEC, offer the sensitivity required to precisely evaluate different grades of polymer-based food additive and to make an optimal choice in formulation


Keywords: English Article Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Food additives Polysaccharides OMNISEC 

The Benefits of Multi-Detector SEC for Protein Analysis Article (English)

Using a light scattering detector as part of a multi-detector Size Exclusion Chromatography system provides the accurate molecular weight (MW) data needed to assess the activity, safety and clinical efficacy of therapeutic proteins.


Keywords: English Article Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Protein aggregation Proteins Biopharmaceutical development Viscotek TDAmax Viscotek TDA 305 

OMNISEC for unsurpassed synthetic polymer characterization Webinar - Recorded (English)

Realize the maximum potential of your polymer using unsurpassed characterization of molecular weight and structure using OMNISEC – our latest gel permeation chromatography / size exclusion chromatography system. Dr. Mark Pothecary, Product Manager, ...

Product:
OMNISEC
Date recorded:
February 17 2015
Language:
English

Keywords: Polymer solids and melts Polymer solutions English Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Polymers, plastics and rubbers Polysaccharides Webinar - Recorded Eastern Time OMNISEC 

The use of triple detection GPC to determine absolute molecular and structural information about low molecular weight heparins Poster (English)

In this work three commercially available Low Molecular Weight Heparin samples (Enoxaparin, Tinzaparin and Dalteparin) are measured by triple-detection GPC and any differences identified. In addition, structural comparisons will be made with a commer...


Keywords: English Poster Molecular structure Molecular weight Gel Permeation Chromatography Size Exclusion Chromatography Pharmaceutical development Viscotek TDAmax Viscotek TDA 305 

The Mark–Houwink plot – Differentiation of Branching and Composition Application Note (English)

Using OMNISEC, we will show how to separate the effects of a structural difference induced by a compositional change to a polymer (e.g. substitution) and the structural change induced by polymer chain branching.


Keywords: English Application Note Molecular structure Molecular size Molecular weight OMNISEC 
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