Your needs: determination of kinetics by DSC in accordance with ASTM E698
What are kinetics ?
Kinetics is the study of the speeds of reactions or transformations, and the factors that influence these speeds. In materials science and chemistry, kinetics enables us to understand how and at what speed a system evolves towards a new state when it undergoes a change, such as an input of thermal energy.
What does ASTM E698 say about the determination of kinetics by DSC?
ASTM E698 is a standard method that describes the procedure for determining the kinetic parameters of a chemical reaction by thermal analysis. More specifically, it concerns the determination of the activation energy (Ea) and the pre-exponential frequency constant (A) using data obtained by differential scanning calorimetry (DSC).
The kinetics analysis is carried out by DSC and applies to well-defined exothermic reactions (cross-linking, crystallisation).
Méthodologie de la détermination de la cinétique par DSC selon l'ASTM E698
Thanks to several tests carried out at different temperature ramps, it is possible to extrapolate the results to estimate the kinetic parameters of the reaction. The activation energy for a given conversion rate is then measured.
The kinetic parameters can then be used to make predictions:
- Conversion curves to estimate the evolution of the conversion rate as a function of time at specific temperatures.
- Isoconversion curves to evaluate the time-temperature pairing required to achieve a given conversion rate.
Step 1 : Analysis of a sample using different ramps to determine the kinetic parameters
Step 2 : Using kinetic parameters to draw prediction curves
FILAB can help you determine kinetics by DSC in accordance with ASTM E698
Applications of the ASTM E698 standard
The predictive aspect of the ASTM E698 standard makes it possible to optimise various processes and, consequently, to reduce losses (time savings, energy savings):
- Design: optimisation of processing conditions (cross-linking, crystallisation).
- Storage: study of the thermal stability of raw materials or active substances.
- Safety: identification of decomposition thresholds for sensitive materials.
Why choose FILAB for the determination of kinetics by DSC according to ASTM E698?
Our laboratory, at the forefront of polymer materials research and development, offers innovative services tailored to a range of industries.
Thanks to our advanced expertise and technical resources, we are able to conduct research into the synthesis, characterization of polymers and their improvement, enabling industries to optimise their production processes and innovate in terms of materials choice.
In this way, we help our industrial partners to develop polymers that are more resistant, durable and environmentally friendly, by meeting specific needs such as improving thermal resistance, flexibility or biocompatibility.
FAQ
The method is based on Friedman's principle and Kissinger's model, which relate the heating rate to the activation energy. These calculations make it possible to:
- Determine the activation energy (Ea).
- Estimate the pre-exponential constant (A) of the Arrhenius model.
- ASTM E698 is more general and covers a wide range of materials subjected to chemical or thermal reactions. It determines several kinetic parameters.
- ASTM E1641, on the other hand, focuses specifically on activation energy related to mass loss under thermogravimetric analysis conditions.
