Meaning
Prescribed laboratory sequence for the thermal degradation of organic substances in an inert atmosphere to identify chemical constituents. Establishing a pyrolysis protocol involves setting specific heating rates and holding temperatures to ensure repeatable decomposition. This method is used to separate polymers from heat-stable inorganic fillers for further inspection.
Thermal Step
Controlled heating ensures that the polymer chains break down into volatile fragments without causing the combustion of the entire sample. The specific temperature reached during the process must be high enough to fully crack the resin but low enough to avoid damaging the mineral components. Repeatability depends on the precise timing of each heating phase and the flow rate of the nitrogen purge gas.
Sample Preparation
Small quantities of material are typically placed in quartz tubes or platinum boats to ensure rapid and uniform heat transfer. Precise weighing before and after the thermal cycle allows for the calculation of the organic fraction of the composite. Proper cleaning of the equipment between runs prevents cross contamination that could skew the analytical results.
Identification Benefit
Analyzing the vapours released during the process helps determine the type of resin and the presence of specific flame retardants or plasticizers. This information is valuable for reverse engineering a competitor’s product or for verifying the purity of recycled feedstocks. The resulting data provides a clear fingerprint of the material composition that simple melt testing cannot provide.
