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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.

Related products

Viscotek range The leading multi-detector GPC/SEC systems and detectors. Image
Molecular structure, Molecular weight, Molecular size, Protein aggregation, Rheology and viscosity
Dilute Solution Viscometry, Size Exclusion Chromatography, Gel Permeation Chromatography, Static Light Scattering
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Monitoring calcium-Induced conformational changes of Calmodulin through size measurements Application Note (English)

Use of the Viscosizer 200 for sizing analysis of Calmodulin samples and assessment of the technique's complementarity to light scattering analysis in the protein characterization workflow.

Keywords: English Application Note Molecular structure Molecular size Particle size Proteins Biological drug characterization and development Bio-formulation development UV area imaging Viscosizer 200 

Investigating the Molecular Weight and Structure of Linear and Cross-Linked Hyaluronic Acid by SEC-MALS and SEC-Triple Detection Article (English)

This article demonstrates the application of a multi-angle light scattering (MALS) detector within a triple detector array to measure absolute molecular weight distribution and gain insight into molecular structure for an application involvin...

Keywords: English Article Viscotek range Molecular structure Molecular weight Static Light Scattering Size Exclusion Chromatography Cosmetics Personal care Consumer healthcare Polysaccharides 

From the applications laboratory: Using GPC/SEC to analyze elastomers Webinar - Recorded (English)

This webinar presents examples of GPC/SEC analysis of various elastomer chemistries and highlights the physical characterization information provided by this technique.

Viscotek range
Date recorded:
September 2 2013

Keywords: Polymer solutions English Viscotek range Molecular structure Molecular weight Gel Permeation Chromatography Size Exclusion Chromatography Polymers, plastics and rubbers Webinar - Recorded Greenwich Time 

Effects of gamma-ray sterilization on high molecular weight PMMA for biomedical applications Application Note (English)

A sample of PMMA was analysed by Size Exclusion Chromatography with Triple detection, before and after sterilization. Reduction in the molecular weight was shown to be firstly by cleaving the polymer at the branching points

Keywords: Polymer solutions English Application Note Viscotek range Molecular structure Molecular weight Gel Permeation Chromatography Static Light Scattering Size Exclusion Chromatography Polymers, plastics and rubbers 

Characterization of branched copolymers by triple detection GPC Application Note (English)

Multi detector GPC/SEC is used to calculate a range of parameters for three branched polymers including; the MW and polydispersity, the hydrodynamic radius, and the MW dependence of the viscosity, branching number and branching frequency

Keywords: Polymer solutions English Application Note Viscotek range Molecular structure Molecular weight Gel Permeation Chromatography Size Exclusion Chromatography Polymers, plastics and rubbers 
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