Dynamic shear rheology and oxidative induction testing quantify gel growth and additive depletion in recycled polyolefins to prevent process failures.
Low frequency storage modulus G prime below 0.1 rad/s isolates high molecular weight elastic recovery to predict bimodal pipe swell and prevent over-extrusion.
Dynamic frequency sweeps isolate polyolefin molecular weight distribution and branching where melt index fails, fixing processability and reject thresholds.
Dynamic low-frequency rheometry identifies thermal degradation in recycled polyolefins that single-point melt flow tests miss entirely.
Bimodal HDPE shear thinning variations alter die swelling and sag resistance, forcing wall thickness adjustments and increasing landed pipe cost.
Zero-shear viscosity drops exponentially before MFR shifts, providing an early indicator of antioxidant depletion in recycled polypropylene.
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