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Additive manufacturing of heat-sensitive polymer melt using a pellet-fed material extrusion
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Zhou, Zuoxin, Salaoru, Iulia, Morris, Peter and Gibbons, Gregory John (2018) Additive manufacturing of heat-sensitive polymer melt using a pellet-fed material extrusion. Additive Manufacturing, 24 . pp. 552-559. doi:10.1016/j.addma.2018.10.040
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Official URL: https://doi.org/10.1016/j.addma.2018.10.040
Abstract
The most common method for Additive Manufacturing (AM) of polymers is melt extrusion, which normally requires several pre-processing steps to compound and extrude filament feedstock, resulting in an overall long melt residency time. Consequently a typical melt extrusion-based AM process is time/cost consuming, and limited in the variety of materials that can be processed. Polyvinyl alcohol (PVOH) is one of the heat-sensitive polymers demonstrating a thermal decomposition temperature overlapping its processing window. This study proposed to use a pellet-fed material extrusion technique to directly process PVOH granules without the necessity of using any pre-processing steps. The approach essentially combined compounding, extrusion and AM, allowing multi-material printing with minimum exposure to heat during the process. The processing parameters were determined via thermal and rheological characterisation of PVOH. Effects of processing temperature and time on the thermal decomposition of PVOH were demonstrated, which further affected the tensile properties and solubility. An increase in Young’s modulus, stress at 2% strain, and Ultimate Tensile Stress were 98±4%, 40±5%, and 20±2%, respectively, was observed when PVOH residency time was reduced from 25min to 14min. The pellet-fed material extrusion technology demonstrated good 3D printability, multi-material printing capability, and great versatility in processing polymer melts.
| Item Type: | Journal Article | ||||||||
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| Subjects: | T Technology > TP Chemical technology T Technology > TS Manufactures |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
| Library of Congress Subject Headings (LCSH): | Polymers -- Additives, Melt spinning, Polyvinyl alcohol, Three-dimensional printing | ||||||||
| Journal or Publication Title: | Additive Manufacturing | ||||||||
| Publisher: | Elsevier | ||||||||
| ISSN: | 2214-8604 | ||||||||
| Official Date: | December 2018 | ||||||||
| Dates: |
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| Volume: | 24 | ||||||||
| Page Range: | pp. 552-559 | ||||||||
| DOI: | 10.1016/j.addma.2018.10.040 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Copyright Holders: | Elsevier | ||||||||
| Funder: | Innovate UK | ||||||||
| Grant number: | 101719 | ||||||||
| Open Access Version: |
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