Cargando…
Mechanical Properties Distribution within Polypropylene Injection Molded Samples: Effect of Mold Temperature under Uneven Thermal Conditions
The quality of the polymer parts produced by injection molding is strongly affected by the processing conditions. Uncontrolled deviations from the proper process parameters could significantly affect both internal structure and final material properties. In this work, to mimic an uneven temperature...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2017
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6418651/ https://www.ncbi.nlm.nih.gov/pubmed/30965891 http://dx.doi.org/10.3390/polym9110585 |
_version_ | 1783403779341680640 |
---|---|
author | Liparoti, Sara Speranza, Vito Sorrentino, Andrea Titomanlio, Giuseppe |
author_facet | Liparoti, Sara Speranza, Vito Sorrentino, Andrea Titomanlio, Giuseppe |
author_sort | Liparoti, Sara |
collection | PubMed |
description | The quality of the polymer parts produced by injection molding is strongly affected by the processing conditions. Uncontrolled deviations from the proper process parameters could significantly affect both internal structure and final material properties. In this work, to mimic an uneven temperature field, a strong asymmetric heating is applied during the production of injection-molded polypropylene samples. The morphology of the samples is characterized by optical and atomic force microscopy (AFM), whereas the distribution of mechanical modulus at different scales is obtained by Indentation and HarmoniX AFM tests. Results clearly show that the temperature differences between the two mold surfaces significantly affect the morphology distributions of the molded parts. This is due to both the uneven temperature field evolutions and to the asymmetric flow field. The final mechanical property distributions are determined by competition between the local molecular stretch and the local structuring achieved during solidification. The cooling rate changes affect internal structures in terms of relaxation/reorganization levels and give rise to an asymmetric distribution of mechanical properties. |
format | Online Article Text |
id | pubmed-6418651 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-64186512019-04-02 Mechanical Properties Distribution within Polypropylene Injection Molded Samples: Effect of Mold Temperature under Uneven Thermal Conditions Liparoti, Sara Speranza, Vito Sorrentino, Andrea Titomanlio, Giuseppe Polymers (Basel) Article The quality of the polymer parts produced by injection molding is strongly affected by the processing conditions. Uncontrolled deviations from the proper process parameters could significantly affect both internal structure and final material properties. In this work, to mimic an uneven temperature field, a strong asymmetric heating is applied during the production of injection-molded polypropylene samples. The morphology of the samples is characterized by optical and atomic force microscopy (AFM), whereas the distribution of mechanical modulus at different scales is obtained by Indentation and HarmoniX AFM tests. Results clearly show that the temperature differences between the two mold surfaces significantly affect the morphology distributions of the molded parts. This is due to both the uneven temperature field evolutions and to the asymmetric flow field. The final mechanical property distributions are determined by competition between the local molecular stretch and the local structuring achieved during solidification. The cooling rate changes affect internal structures in terms of relaxation/reorganization levels and give rise to an asymmetric distribution of mechanical properties. MDPI 2017-11-07 /pmc/articles/PMC6418651/ /pubmed/30965891 http://dx.doi.org/10.3390/polym9110585 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Liparoti, Sara Speranza, Vito Sorrentino, Andrea Titomanlio, Giuseppe Mechanical Properties Distribution within Polypropylene Injection Molded Samples: Effect of Mold Temperature under Uneven Thermal Conditions |
title | Mechanical Properties Distribution within Polypropylene Injection Molded Samples: Effect of Mold Temperature under Uneven Thermal Conditions |
title_full | Mechanical Properties Distribution within Polypropylene Injection Molded Samples: Effect of Mold Temperature under Uneven Thermal Conditions |
title_fullStr | Mechanical Properties Distribution within Polypropylene Injection Molded Samples: Effect of Mold Temperature under Uneven Thermal Conditions |
title_full_unstemmed | Mechanical Properties Distribution within Polypropylene Injection Molded Samples: Effect of Mold Temperature under Uneven Thermal Conditions |
title_short | Mechanical Properties Distribution within Polypropylene Injection Molded Samples: Effect of Mold Temperature under Uneven Thermal Conditions |
title_sort | mechanical properties distribution within polypropylene injection molded samples: effect of mold temperature under uneven thermal conditions |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6418651/ https://www.ncbi.nlm.nih.gov/pubmed/30965891 http://dx.doi.org/10.3390/polym9110585 |
work_keys_str_mv | AT liparotisara mechanicalpropertiesdistributionwithinpolypropyleneinjectionmoldedsampleseffectofmoldtemperatureunderuneventhermalconditions AT speranzavito mechanicalpropertiesdistributionwithinpolypropyleneinjectionmoldedsampleseffectofmoldtemperatureunderuneventhermalconditions AT sorrentinoandrea mechanicalpropertiesdistributionwithinpolypropyleneinjectionmoldedsampleseffectofmoldtemperatureunderuneventhermalconditions AT titomanliogiuseppe mechanicalpropertiesdistributionwithinpolypropyleneinjectionmoldedsampleseffectofmoldtemperatureunderuneventhermalconditions |