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Effect of Mold Temperature on the Impact Behavior and Morphology of Injection Molded Foams Based on Polypropylene Polyethylene–Octene Copolymer Blends

1
Cellular Laboratory (CellMat), Universidad de Valladolid, 47011 Valladolid, Spain
2
CellMat Technologies S.L., Paseo de Belen 9-A (CTTA Building), 47011 Valladolid, Spain
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(5), 894; https://doi.org/10.3390/polym11050894
Received: 18 March 2019 / Revised: 9 May 2019 / Accepted: 10 May 2019 / Published: 15 May 2019
(This article belongs to the Special Issue Foaming and Injection Moulding in Polymer Processing)
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Abstract

In this work, an isotactic polypropylene (PP) and a polyethylene–octene copolymer (POE) have been blended and injection-molded, obtaining solids and foamed samples with a relative density of 0.76. Different mold temperature and injection temperature were used. The Izod impact strength was measured. For solids, higher mold temperature increased the impact resistance, whereas in foams, the opposite trend was observed. In order to understand the reasons of this behavior, the morphology of the elastomeric phase, the crystalline morphology and the cellular structure have been studied. The presence of the elastomer near the skin in the case of high mold temperature can explain the improvement produced with a high mold temperature in solids. For foams, aspects as the elastomer coarsening in the core of the sample or the presence of a thicker solid skin are the critical parameters that justify the improved behavior of the materials produced with a lower mold temperature. View Full-Text
Keywords: polypropylene; POE; foam; impact strength; elastomer morphology; crystalline morphology; cellular structure polypropylene; POE; foam; impact strength; elastomer morphology; crystalline morphology; cellular structure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Muñoz-Pascual, S.; Lopez-Gonzalez, E.; Saiz-Arroyo, C.; Rodriguez-Perez, M.A. Effect of Mold Temperature on the Impact Behavior and Morphology of Injection Molded Foams Based on Polypropylene Polyethylene–Octene Copolymer Blends. Polymers 2019, 11, 894.

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