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Single-Point Incremental Forming of Two Biocompatible Polymers: An Insight into Their Thermal and Structural Properties

Sheets of polycaprolactone (PCL) and ultra-high molecular weight polyethylene (UHMWPE) were fabricated and shaped by the Single-Point Incremental Forming process (SPIF). The performance of these biocompatible polymers in SPIF was assessed through the variation of four main parameters: the diameter o...

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Autores principales: Lozano-Sánchez, Luis Marcelo, Bagudanch, Isabel, Sustaita, Alan Osiris, Iturbe-Ek, Jackeline, Elizalde, Luis Ernesto, Garcia-Romeu, Maria Luisa, Elías-Zúñiga, Alex
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6415463/
https://www.ncbi.nlm.nih.gov/pubmed/30966426
http://dx.doi.org/10.3390/polym10040391
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author Lozano-Sánchez, Luis Marcelo
Bagudanch, Isabel
Sustaita, Alan Osiris
Iturbe-Ek, Jackeline
Elizalde, Luis Ernesto
Garcia-Romeu, Maria Luisa
Elías-Zúñiga, Alex
author_facet Lozano-Sánchez, Luis Marcelo
Bagudanch, Isabel
Sustaita, Alan Osiris
Iturbe-Ek, Jackeline
Elizalde, Luis Ernesto
Garcia-Romeu, Maria Luisa
Elías-Zúñiga, Alex
author_sort Lozano-Sánchez, Luis Marcelo
collection PubMed
description Sheets of polycaprolactone (PCL) and ultra-high molecular weight polyethylene (UHMWPE) were fabricated and shaped by the Single-Point Incremental Forming process (SPIF). The performance of these biocompatible polymers in SPIF was assessed through the variation of four main parameters: the diameter of the forming tool, the spindle speed, the feed rate, and the step size based on a Box–Behnken design of experiments of four variables and three levels. The design of experiments allowed us to identify the parameters that most affect the forming of PCL and UHMWPE. The study was completed by means of a deep characterization of the thermal and structural properties of both polymers. These properties were correlated to the performance of the polymers observed in SPIF, and it was found that the polymer chains are oriented as a consequence of the SPIF processing. Moreover, by X-ray diffraction it was proved that polymer chains behave differently on each surface of the fabricated parts, since the chains on the surface in contact with the forming tool are oriented horizontally, while on the opposite surface they are oriented in the vertical direction. The unit cell of UHMWPE is distorted, passing from an orthorhombic cell to a monoclinic due to the slippage between crystallites. This slippage between crystallites was observed in both PCL and UHMWPE, and was identified as an alpha star thermal transition located in the rubbery region between the glass transition and the melting point of each polymer.
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spelling pubmed-64154632019-04-02 Single-Point Incremental Forming of Two Biocompatible Polymers: An Insight into Their Thermal and Structural Properties Lozano-Sánchez, Luis Marcelo Bagudanch, Isabel Sustaita, Alan Osiris Iturbe-Ek, Jackeline Elizalde, Luis Ernesto Garcia-Romeu, Maria Luisa Elías-Zúñiga, Alex Polymers (Basel) Article Sheets of polycaprolactone (PCL) and ultra-high molecular weight polyethylene (UHMWPE) were fabricated and shaped by the Single-Point Incremental Forming process (SPIF). The performance of these biocompatible polymers in SPIF was assessed through the variation of four main parameters: the diameter of the forming tool, the spindle speed, the feed rate, and the step size based on a Box–Behnken design of experiments of four variables and three levels. The design of experiments allowed us to identify the parameters that most affect the forming of PCL and UHMWPE. The study was completed by means of a deep characterization of the thermal and structural properties of both polymers. These properties were correlated to the performance of the polymers observed in SPIF, and it was found that the polymer chains are oriented as a consequence of the SPIF processing. Moreover, by X-ray diffraction it was proved that polymer chains behave differently on each surface of the fabricated parts, since the chains on the surface in contact with the forming tool are oriented horizontally, while on the opposite surface they are oriented in the vertical direction. The unit cell of UHMWPE is distorted, passing from an orthorhombic cell to a monoclinic due to the slippage between crystallites. This slippage between crystallites was observed in both PCL and UHMWPE, and was identified as an alpha star thermal transition located in the rubbery region between the glass transition and the melting point of each polymer. MDPI 2018-04-01 /pmc/articles/PMC6415463/ /pubmed/30966426 http://dx.doi.org/10.3390/polym10040391 Text en © 2018 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
Lozano-Sánchez, Luis Marcelo
Bagudanch, Isabel
Sustaita, Alan Osiris
Iturbe-Ek, Jackeline
Elizalde, Luis Ernesto
Garcia-Romeu, Maria Luisa
Elías-Zúñiga, Alex
Single-Point Incremental Forming of Two Biocompatible Polymers: An Insight into Their Thermal and Structural Properties
title Single-Point Incremental Forming of Two Biocompatible Polymers: An Insight into Their Thermal and Structural Properties
title_full Single-Point Incremental Forming of Two Biocompatible Polymers: An Insight into Their Thermal and Structural Properties
title_fullStr Single-Point Incremental Forming of Two Biocompatible Polymers: An Insight into Their Thermal and Structural Properties
title_full_unstemmed Single-Point Incremental Forming of Two Biocompatible Polymers: An Insight into Their Thermal and Structural Properties
title_short Single-Point Incremental Forming of Two Biocompatible Polymers: An Insight into Their Thermal and Structural Properties
title_sort single-point incremental forming of two biocompatible polymers: an insight into their thermal and structural properties
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6415463/
https://www.ncbi.nlm.nih.gov/pubmed/30966426
http://dx.doi.org/10.3390/polym10040391
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