The extrusion process clearly affects the thermal behavior of the material, transforming from a material unable to crystallize under the conditions of the assay (10 °C/min heating rate) to show a clear trend to crystallize.
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Characterization of PLA Sheets Prepared by Stretching under Different Conditions: Influence of Reprocessing and Establishing Optimal Conditions.
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The sentences
The yield strength shows a negative trend with temperature, particularly for the unextruded samples: higher temperatures lead to lower resistance.
The curves follow an expected trend, with almost a plateau plotted for the storage modulus at lower temperatures and a sharp decrease after reaching a certain temperature, close to the heat deflection.
Finally, the brittleness factor (calculated at 25 °C) shows an increasing trend with the processing, especially for the LD samples, as was also observed in the static mechanical testing.