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