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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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Understanding the effect of molecular weight and structure on the performance characteristics of cellulose derivatives using OMNISEC Application Note (English)

A variety of aqueous (water-soluble) cellulose derivatives were characterized using the OMNISEC triple detection GPC/SEC system which revealed subtle, yet distinct differences between them. The differences described in this application note could be ...


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 Pharmaceutical development Excipients and coatings OMNISEC 

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 

GPC/SEC analysis of polylactic acid (PLA) and poly(lactic-co-glycolic acid) (PLGA) using OMNISEC Application Note (English)

In this application note, a selection of different PLA and PLGA polymer samples were analyzed on Malvern's OMNISEC GPC/SEC system, which combines multiple detectors to provide information about structure and solution properties.


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 Specialty and novel polymers Polymer recycling OMNISEC 

Structure-molecular weight relationships of synthetic polymers Application Note (English)

In this application note, the structural distribution of some common polymers are compared using the Mark-Houwink plot. The data are all generated using the advanced OMNISEC multi-detector GPC/SEC system


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

An introduction to OMNISEC RESOLVE Technical Note (English)

This technical note describes the features and benefits of OMNISEC RESOLVE. It also includes a discussion of the value of OMNISEC as a complete system as opposed to upgrading an existing conventional system to advanced detection.


Keywords: Polymer solutions English Technical Note Molecular structure Molecular size Molecular weight Gel Permeation Chromatography Size Exclusion Chromatography Bulk (commodity) polymers Engineering polymers Polymers from renewable sources Specialty and novel polymers Polymer recycling OMNISEC 
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