Second, the effects of multi-extrusion 3D printing processing parameters on the thermal stability of PLA, PMMA and their printed specimens were analyzed by GPC. First, further physicochemical and dynamic thermomechanical characterizations were performed. The main objective was to better understand the interface/interphase properties developed during this innovative processing. Thus, 3D-printed parts with repeating PMMA/PLA/PMMA layers in the Z building direction were successfully prepared in different numbers but maintaining the same composition. This polymer pair was chosen for their miscibility at the melt state and synergistic properties (i.e., to improve and weather tune the temperature resistance, transparency and thermomechanical properties of their PLA-based materials). The present work deals with the 3D printing of multimaterials based on PLA/PMMA multilayers directly obtained from pellets.
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