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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Main Authors: Olga Mysiukiewicz, Mateusz Barczewski, Katarzyna Skórczewska, Danuta Matykiewicz
Format: Article
Language:English
Published: MDPI AG 2020-06-01
Series:Polymers
Subjects:
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.
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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
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AT katarzynaskorczewska correlationbetweenprocessingparametersanddegradationofdifferentpolylactidegradesduringtwinscrewextrusion
AT danutamatykiewicz correlationbetweenprocessingparametersanddegradationofdifferentpolylactidegradesduringtwinscrewextrusion