Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion
This article presents the effect of twin-screw extrusion processing parameters, including temperature and rotational speed of screws, on the structure and properties of four grades of polylactide (PLA). To evaluate the critical processing parameters for PLA and the possibilities for oxidative and th...
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MDPI AG
2020-06-01
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Series: | Polymers |
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Online Access: | https://www.mdpi.com/2073-4360/12/6/1333 |
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author | Olga Mysiukiewicz Mateusz Barczewski Katarzyna Skórczewska Danuta Matykiewicz |
author_facet | Olga Mysiukiewicz Mateusz Barczewski Katarzyna Skórczewska Danuta Matykiewicz |
author_sort | Olga Mysiukiewicz |
collection | DOAJ |
description | This article presents the effect of twin-screw extrusion processing parameters, including temperature and rotational speed of screws, on the structure and properties of four grades of polylactide (PLA). To evaluate the critical processing parameters for PLA and the possibilities for oxidative and thermomechanical degradation, Fourier-transform infrared spectroscopy (FT-IR), oscillatory rheological analysis, and differential scanning calorimetry (DSC) measurements were used. The influence of degradation induced by processing temperature and high shearing conditions on the quality of the biodegradable polyesters with different melt flow indexes (MFIs)was investigated by color analysis within the CIELab scale. The presented results indicate that considering the high-temperature processing of PLA, the high mass flow index and low viscosity of the polymer reduce its time of residence in the plastifying unit and therefore limit discoloration and reduction of molecular weight due to the degradation process during melt mixing, whereas the initial molecular weight of the polymer is not an essential factor. |
first_indexed | 2024-03-10T19:14:03Z |
format | Article |
id | doaj.art-723af01fc2bb43cd810158f6878ba54f |
institution | Directory Open Access Journal |
issn | 2073-4360 |
language | English |
last_indexed | 2024-03-10T19:14:03Z |
publishDate | 2020-06-01 |
publisher | MDPI AG |
record_format | Article |
series | Polymers |
spelling | doaj.art-723af01fc2bb43cd810158f6878ba54f2023-11-20T03:33:32ZengMDPI AGPolymers2073-43602020-06-01126133310.3390/polym12061333Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw ExtrusionOlga Mysiukiewicz0Mateusz Barczewski1Katarzyna Skórczewska2Danuta Matykiewicz3Institute of Materials Technology, Poznan University of Technology, Piotrowo 3, 61-138 Poznan, PolandInstitute of Materials Technology, Poznan University of Technology, Piotrowo 3, 61-138 Poznan, PolandFaculty of Chemical Technology and Engineering, UTP University of Science and Technology, Seminaryjna 3, 85-326 Bydgoszcz, PolandInstitute of Materials Technology, Poznan University of Technology, Piotrowo 3, 61-138 Poznan, PolandThis article presents the effect of twin-screw extrusion processing parameters, including temperature and rotational speed of screws, on the structure and properties of four grades of polylactide (PLA). To evaluate the critical processing parameters for PLA and the possibilities for oxidative and thermomechanical degradation, Fourier-transform infrared spectroscopy (FT-IR), oscillatory rheological analysis, and differential scanning calorimetry (DSC) measurements were used. The influence of degradation induced by processing temperature and high shearing conditions on the quality of the biodegradable polyesters with different melt flow indexes (MFIs)was investigated by color analysis within the CIELab scale. The presented results indicate that considering the high-temperature processing of PLA, the high mass flow index and low viscosity of the polymer reduce its time of residence in the plastifying unit and therefore limit discoloration and reduction of molecular weight due to the degradation process during melt mixing, whereas the initial molecular weight of the polymer is not an essential factor.https://www.mdpi.com/2073-4360/12/6/1333polylactideextrusiondegradationprocessing parameters |
spellingShingle | Olga Mysiukiewicz Mateusz Barczewski Katarzyna Skórczewska Danuta Matykiewicz Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion Polymers polylactide extrusion degradation processing parameters |
title | Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion |
title_full | Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion |
title_fullStr | Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion |
title_full_unstemmed | Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion |
title_short | Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion |
title_sort | correlation between processing parameters and degradation of different polylactide grades during twin screw extrusion |
topic | polylactide extrusion degradation processing parameters |
url | https://www.mdpi.com/2073-4360/12/6/1333 |
work_keys_str_mv | AT olgamysiukiewicz correlationbetweenprocessingparametersanddegradationofdifferentpolylactidegradesduringtwinscrewextrusion AT mateuszbarczewski correlationbetweenprocessingparametersanddegradationofdifferentpolylactidegradesduringtwinscrewextrusion AT katarzynaskorczewska correlationbetweenprocessingparametersanddegradationofdifferentpolylactidegradesduringtwinscrewextrusion AT danutamatykiewicz correlationbetweenprocessingparametersanddegradationofdifferentpolylactidegradesduringtwinscrewextrusion |