Development of Tensile Properties and Crystalline Conformation of Recycled Polypropylene by Re-Extrusion Using a Twin-Screw Extruder with an Additional Molten Resin Reservoir Unit
Plastic mechanical recycling is an attractive method for reducing the amounts of waste plastics. However, the alterations in the mechanical properties (degradation) in recycled plastics is a limitation to the material’s mechanical recycling. In this study, the mechanical recycling was enhanced by th...
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doaj-c645f9db6cf8468a91237925cab31ecf2021-02-15T00:02:37ZengMDPI AGApplied Sciences2076-34172021-02-01111707170710.3390/app11041707Development of Tensile Properties and Crystalline Conformation of Recycled Polypropylene by Re-Extrusion Using a Twin-Screw Extruder with an Additional Molten Resin Reservoir UnitPatchiya Phanthong0Yusuke Miyoshi1Shigeru Yao2Research Institute for the Creation of Functional and Structural Materials, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, JapanGraduate School of Chemical Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, JapanResearch Institute for the Creation of Functional and Structural Materials, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, JapanPlastic mechanical recycling is an attractive method for reducing the amounts of waste plastics. However, the alterations in the mechanical properties (degradation) in recycled plastics is a limitation to the material’s mechanical recycling. In this study, the mechanical recycling was enhanced by the addition of a “molten resin reservoir” unit at the end of the twin-screw extruder. Recycled polypropylene (RPP) obtained from a household was re-extruded with this developed extrusion unit. The tensile properties, type of crystalline, and conformation of polypropylene polymorphs were evaluated and compared for virgin polypropylene (VPP), recycled polypropylene (RPP) without extrusion (RPP-original), and RPP with extrusion by using a new type of extruder (RPP-extrusion). It could be found that the tensile properties of RPP-extrusion were improved, so as to be similar to those of VPP. In addition, the conformation of RPP-extrusion was similar to that of VPP by increasing the ratio between the helix and parallel band. This study succeeded in regenerating the tensile properties and inner structures in recycled PP, which could prolong the used lifetime and decrease the amount of waste from single-use plastic.https://www.mdpi.com/2076-3417/11/4/1707polypropylene recyclingrecycled plastichousehold plastic wastepolypropylenetwin-screw extrusiontensile properties |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Patchiya Phanthong Yusuke Miyoshi Shigeru Yao |
spellingShingle |
Patchiya Phanthong Yusuke Miyoshi Shigeru Yao Development of Tensile Properties and Crystalline Conformation of Recycled Polypropylene by Re-Extrusion Using a Twin-Screw Extruder with an Additional Molten Resin Reservoir Unit Applied Sciences polypropylene recycling recycled plastic household plastic waste polypropylene twin-screw extrusion tensile properties |
author_facet |
Patchiya Phanthong Yusuke Miyoshi Shigeru Yao |
author_sort |
Patchiya Phanthong |
title |
Development of Tensile Properties and Crystalline Conformation of Recycled Polypropylene by Re-Extrusion Using a Twin-Screw Extruder with an Additional Molten Resin Reservoir Unit |
title_short |
Development of Tensile Properties and Crystalline Conformation of Recycled Polypropylene by Re-Extrusion Using a Twin-Screw Extruder with an Additional Molten Resin Reservoir Unit |
title_full |
Development of Tensile Properties and Crystalline Conformation of Recycled Polypropylene by Re-Extrusion Using a Twin-Screw Extruder with an Additional Molten Resin Reservoir Unit |
title_fullStr |
Development of Tensile Properties and Crystalline Conformation of Recycled Polypropylene by Re-Extrusion Using a Twin-Screw Extruder with an Additional Molten Resin Reservoir Unit |
title_full_unstemmed |
Development of Tensile Properties and Crystalline Conformation of Recycled Polypropylene by Re-Extrusion Using a Twin-Screw Extruder with an Additional Molten Resin Reservoir Unit |
title_sort |
development of tensile properties and crystalline conformation of recycled polypropylene by re-extrusion using a twin-screw extruder with an additional molten resin reservoir unit |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2021-02-01 |
description |
Plastic mechanical recycling is an attractive method for reducing the amounts of waste plastics. However, the alterations in the mechanical properties (degradation) in recycled plastics is a limitation to the material’s mechanical recycling. In this study, the mechanical recycling was enhanced by the addition of a “molten resin reservoir” unit at the end of the twin-screw extruder. Recycled polypropylene (RPP) obtained from a household was re-extruded with this developed extrusion unit. The tensile properties, type of crystalline, and conformation of polypropylene polymorphs were evaluated and compared for virgin polypropylene (VPP), recycled polypropylene (RPP) without extrusion (RPP-original), and RPP with extrusion by using a new type of extruder (RPP-extrusion). It could be found that the tensile properties of RPP-extrusion were improved, so as to be similar to those of VPP. In addition, the conformation of RPP-extrusion was similar to that of VPP by increasing the ratio between the helix and parallel band. This study succeeded in regenerating the tensile properties and inner structures in recycled PP, which could prolong the used lifetime and decrease the amount of waste from single-use plastic. |
topic |
polypropylene recycling recycled plastic household plastic waste polypropylene twin-screw extrusion tensile properties |
url |
https://www.mdpi.com/2076-3417/11/4/1707 |
work_keys_str_mv |
AT patchiyaphanthong developmentoftensilepropertiesandcrystallineconformationofrecycledpolypropylenebyreextrusionusingatwinscrewextruderwithanadditionalmoltenresinreservoirunit AT yusukemiyoshi developmentoftensilepropertiesandcrystallineconformationofrecycledpolypropylenebyreextrusionusingatwinscrewextruderwithanadditionalmoltenresinreservoirunit AT shigeruyao developmentoftensilepropertiesandcrystallineconformationofrecycledpolypropylenebyreextrusionusingatwinscrewextruderwithanadditionalmoltenresinreservoirunit |
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