Correction published on 11 March 2020, see
Materials 2020, 13(6), 1277.
Hierarchical Structure of iPP During Injection Molding Process with Fast Mold Temperature Evolution
Department of Industrial Engineering, University of Salerno–via Giovanni Paolo II, 132, 84084 Fisciano (SA), Italy
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Materials 2019, 12(3), 424; https://doi.org/10.3390/ma12030424
Received: 3 January 2019
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Revised: 23 January 2019
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Accepted: 25 January 2019
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Published: 30 January 2019
(This article belongs to the Special Issue Polymer Processing: Modeling and Correlations Finalized to Tailoring the Plastic Part Morphology and Properties)
Mold surface temperature strongly influences the molecular orientation and morphology developed in injection molded samples. In this work, an isotactic polypropylene was injected into a rectangular mold, in which the cavity surface temperature was properly modulated during the process by an electrical heating device. The induced thermo-mechanical histories strongly influenced the morphology developed in the injection molded parts. Polarized optical microscope and atomic force microscope were adopted for morphological investigations. The combination of flow field and cooling rate experienced by the polymer determined the hierarchical structure. Under strong flow fields and high temperatures, a tightly packed structure, called shish-kebab, aligned along the flow direction, was observed. Under weak flow fields, the formation of β-phase, as cylindrites form, was observed. The formation of each morphological structure was analyzed and discussed on the bases of the flow and temperature fields, experienced by the polymer during each stage of the injection molding process.
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Keywords:
morphology; injection molding; cylindrites; mold temperature
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MDPI and ACS Style
Speranza, V.; Liparoti, S.; Pantani, R.; Titomanlio, G. Hierarchical Structure of iPP During Injection Molding Process with Fast Mold Temperature Evolution. Materials 2019, 12, 424. https://doi.org/10.3390/ma12030424
AMA Style
Speranza V, Liparoti S, Pantani R, Titomanlio G. Hierarchical Structure of iPP During Injection Molding Process with Fast Mold Temperature Evolution. Materials. 2019; 12(3):424. https://doi.org/10.3390/ma12030424
Chicago/Turabian StyleSperanza, Vito, Sara Liparoti, Roberto Pantani, and Giuseppe Titomanlio. 2019. "Hierarchical Structure of iPP During Injection Molding Process with Fast Mold Temperature Evolution" Materials 12, no. 3: 424. https://doi.org/10.3390/ma12030424
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