Diffusion

HEAD OFFICE

+46 70 6042006

Stockholmsvägen 59

SE-761 43 NORRTĂ„LJE

Contact

info@polymira.se

Diffusion

Diffusion refer to the process of absorption/desorption of a solute, e.g. water or oxygen by a polymer material. The diffusion process consist of several steps starting with solution of the solute in the surface of the material. For gases the concentration in the surfaces layer can be predicted by Henrys law.

 

Diffusion may result in Diffusion Limited Oxidation (DLO) which means that oxidation of a material is limited by the access of oxygen in the bulk of the material, resulting in oxygen concentration profiles. For selected polymers the general Basic Autooxidation Scheme (BAS) desribes the rate of oxidation as function of oxygen concentration which can predict oxidation rate profiles in a material.

Services

  • Prediction of curing behaviour of thermoset
  • Hydration of concrete and degree of hydration
  • Simulation of temperature and conversion profiles in thick walled structures

Keywords

  • Diffusion coefficient
  • Diffusion profiles
  • Water uptake
  • Gas permeability
  • Temperature dependency
  • Activation energy
  • Concentration dependency
  • Kinetics

 

Competence

Polymer technology

  • Polymer materials
  • Polymer processing
  • Characterisation
  • Curing of thermoset

 

Epoxy technology

  • Curing progress
  • Conversion, vitrification
  • Curing kinetics
  • Resin and curing systems

 

Analysis & Characterisation

  • DSC, TGA
  • DMA
  • Tensile testing
  • Creep testing
  • Diffusion properties

Stability and lifetime

  • Accelerated ageing
  • Climate chamber
  • Life time prediction
  • Reaction kinetics
  • Life time extension

 

Simulation & Modeling

  • Heat transfer
  • Structural mechanics
  • Flow properties
  • Diffusions properties
  • Electric properties

 

Flow properties

  • Viscosity
  • Viscosity function
  • Pseudo-plastic
  • Thixotropy
  • Flow behaviour

 

Polymira AB

Contact: info@polymira.se