What is ISO 11358‑2 about ?
ISO 11358‑2 is part two of a series of documents that specifies a method for the determination of the activation energy, Ea, in the Arrhenius formula for the decomposition of polymers using a thermogravimetric technique.
Note: The method is applicable only if the reaction proceeds by a single mechanism. It is applicable to multistage reactions if they consist of clearly separated single-stage steps.
Who is ISO 11358‑2 for ?
ISO 11358‑2 on Thermogravimetry (TG) of polymers - Determination of activation energy is useful for:
- Thermal engineers
- Polymer industries
- Plastic industry
Why should you use ISO 11358‑2 ?
Thermogravimetric analysis (TGA) is an analytical technique used to determine a material’s thermal stability and its fraction of volatile components by monitoring the weight change that occurs as a sample is heated at a constant rate.
For most polymers, viscous flow activation energy is the minimum energy required for the flow unit (chain segment) to overcome the barrier and transit from the in-situ position to the nearby “hole” in the flow process, and it is a sign of the sensitivity for the apparent shear viscosity to temperature.
The procedure to determine activation energy involved in this document includes non-oxidative reactions and oxidative reactions.
ISO 11358-2 helps you determine the activation energy of polymers with respect to varying temperatures. This will help you understand the sensitivity and viscosity of the polymer, which will give you more knowledge and hence help increase safety in your organization.
What’s changed since the last update ?
BS ISO 11358‑2:2021 supersedes BS ISO 11358‑2:2014, which is withdrawn.
BS ISO 11358‑2:2021 includes some technical changes with respect to BS ISO 11358‑2:2014. These are:
- The designation of rate of conversion has been changed in order to match that used in ISO 11358‑3.
- The purge gas requirements have been changed with a reference to ISO 11358‑1.
