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Publicado em “Proceedings of PPS-29 : The 29th International Conference of the Polymer Processing Society - Conference Papers. ISBN 978-0-7354-1227-9”In this work, we investigate the development of the morphology of an injection molding polypropylene under the localthermomechanical environment imposed during processing, and its effect on the contact angle and, hence, on the surfacetension of the moldings. Melt and mold temperatures were varied in two levels. The local thermomechanical environment wascharacterized by mold filling computational simulations that allow the calculation of thermomechanical variables (e.g., localtemperatures, shear stresses) and indices (related to the local morphology development). In order to investigate the structuralhierarchy variations of the moldings in the thickness direction, samples from skin to core were used. The molecular orientationand degree of crystallinity were determined as function of the thickness, as well as the contact angle. The variations of thedegree of crystallinity were assessed by differential scanning calorimetry. The level of molecular orientation was evaluated bybirefringence measurements. The contact angles were measured in deionized water by sessile drop (needle in) method at roomtemperature, to determine the wettability of the samples. The contact angles were found to vary along the molding thickness inthe skin, transition and core layers. These variations are related to the local morphologies developed. Results suggest that watercontact angle increases with the level of molecular orientation and for finer microstructures

Influence of the local morphology on the surface tension of injection molded polypropylene