Polyolefin Degradation Mechanics in Post-Consumer Resin Recyclate Streams
Polyolefin recyclate degradation occurs via PP chain scission and PE crosslinking; verification requires dual-weight MFR sweeps and 30-minute OIT testing.
Oxidation Induction Time Iso 11357 6
Meaning
Thermal stability measurement determines the time required for a polymer specimen to begin oxidizing when exposed to an oxygen atmosphere at a constant elevated temperature. The test method specified by oxidation induction time iso 11357 6 utilizes differential scanning calorimetry to detect the exothermic reaction associated with polymer degradation. This value measures the effectiveness of the antioxidant package present in the compound.
The test results help determine the lifetime of plastic parts in hot environments.
Testing Procedure
Specimen heating occurs under an inert nitrogen flow until the target temperature is reached and stabilized. During the execution of oxidation induction time iso 11357 6, the gas is switched to oxygen to begin the oxidation process. The time from the gas switch to the start of the exothermic degradation reaction represents the thermal endurance of the material.
This measurement must be precise to be useful.
Process Control
Extruder run parameters must be tuned to protect the polymer matrix from premature degradation during compounding. Comparing results from oxidation induction time iso 11357 6 allows processors to evaluate the thermal consumption of stabilizers during molding. This evaluation helps adjust processing speeds to prevent material burnout.
Resin Evaluation
Antioxidant concentration in incoming plastic resin directly impacts the long term behavior of the molded product. Utilizing oxidation induction time iso 11357 6 allows molders to verify that recycled resins have been adequately restabilized before production. This verification maintains part quality.