Post-Consumer Polyester Non-Aqueous Volatile Desorption Kinetics Baseline
Non-aqueous volatile desorption kinetics in post-consumer polyester depend on flake thickness, Arrhenius diffusion limits, and sweep gas partial pressures.
Toluene Extraction
Meaning
Analytical method that uses the aromatic solvent methylbenzene to dissolve and remove additives or contaminants from a polymer matrix. Toluene extraction is often used to quantify the amount of plasticizer or stabilizer present in a flexible PVC compound. The process involves soaking the sample in the solvent and then evaporating the liquid to weigh the remaining residue.
Solvent Leaching
Dissolving the target substances requires that the solvent penetrates deep into the plastic. The toluene extraction procedure often takes several hours to ensure that all the additives have been pulled into the liquid phase.
Additive Analysis
Separating the extracted chemicals allows a laboratory to check if a resin meets its original specification. Using toluene extraction, a quality control team can identify the presence of unauthorized fillers or recycled content that was not declared by the supplier.
Laboratory Procedure
Safe handling of the chemicals is necessary because of the volatile nature of the solvent. Toluene extraction remains a standard test in the polymer industry despite the development of faster methods because of its reliability and low cost. This technique provides a definitive measurement of the total extractable content in a plastic part and is used to confirm that a material is suitable for long term exposure to various environments.