A Discovery Hybrid Rheometer (DHR-3, TA Instruments) was used to investigate the rheological properties of the lignin-based composites. Parallel plates 8 mm in diameter with a sample gap of approximately 0.4 mm were used for all the melt rheological characterizations. Strain sweeps at 100 rad/s and selected temperatures ranging from 170° to 230°C were carried out to determine the elastic response of the studied samples in the melt. Frequency sweeps from 100 to 0.1 rad/s at different temperatures were performed, and the master curves were constructed. The measurements were carried out in the linear regions (very low strain) and in a nitrogen atmosphere.

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