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Mechanical properties, morphology, and hydrolytic degradation behavior of poly lactic acid/thermoplastic polyurethane blends

Polylactic acid (PLA) has attracted tremendous interest to be utilized as the replacement for petroleum-based polymers as it possesses good biodegradability, can be derived from renewable sources, and shows high mechanical strength. However, its inherent brittleness and low toughness has limited its...

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Main Authors: Buys, Yose Fachmi, Ahmad, Mimi Syakina, Anuar, Hazleen, Mahmud, Mudrikah Sofia, Mohd Nasir, Nur Aimi
Format: Article
Language:English
English
Published: Kulliyyah of Engineering, International Islamic University Malaysia 2020
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://irep.iium.edu.my/88037/1/88037_Mechanical%20properties%2C%20morphology%2C%20and%20hydrolytic.pdf
http://irep.iium.edu.my/88037/2/88037_Mechanical%20properties%2C%20morphology%2C%20and%20hydrolytic_WoS.pdf
http://irep.iium.edu.my/88037/
https://journals.iium.edu.my/ejournal/index.php/iiumej/article/view/1051/726
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spelling my.iium.irep.880372021-02-01T03:35:43Z http://irep.iium.edu.my/88037/ Mechanical properties, morphology, and hydrolytic degradation behavior of poly lactic acid/thermoplastic polyurethane blends Buys, Yose Fachmi Ahmad, Mimi Syakina Anuar, Hazleen Mahmud, Mudrikah Sofia Mohd Nasir, Nur Aimi TJ Mechanical engineering and machinery Polylactic acid (PLA) has attracted tremendous interest to be utilized as the replacement for petroleum-based polymers as it possesses good biodegradability, can be derived from renewable sources, and shows high mechanical strength. However, its inherent brittleness and low toughness has limited its usage in broader applications. In this work, PLA was melt blended with tough thermoplastic polyurethanes (TPU) in order to produce eco-friendly polymeric materials with balanced mechanical properties. Moreover, the miscibility and the hydrolytic degradation behaviour of PLA/TPU blends were also investigated as it is important to control material degradation behaviour in some applications. Five compositions of specimens, i.e. neat PLA, PLA/TPU 75/25 vol%. PLA/TPU 50/50 vol%, PLA/TPU 25/75 vol%. and neat TPU, were prepared by melt blending PLA with TPU using an internal mixer, followed by compression moulding. Tensile and impact tests were performed to evaluate the mechanical properties. From the tests, it was apparent that the elongation-at-break and impact strength of the blends increased as the TPU content increased. Dynamic Mechanical Analysis (DMA) and Scanning Electron Microscopy (SEM) observation were conducted to evaluate the miscibility of PLA/TPU blends. DMA results of the blends revealed two tangent delta peaks, indicating that the blends were immiscible, and the SEM micrographs supported this trend. Finally, hydrolytic degradation behaviour of PLA, TPU and PLA/TPU blends was investigated by measuring the weight loss after immersion of the specimens in alkaline solution at a predetermined time, i.e. every 24 hours for up to 8 days. It was found that the degradation behaviour is affected by blend composition, where PLA/TPU 50/50 vol% showed the fastest degradation rate. This result might be ascribed to the co-continuous morphology shown in the PLA/TPU blend 50/50 vol% Kulliyyah of Engineering, International Islamic University Malaysia 2020-01-20 Article PeerReviewed application/pdf en http://irep.iium.edu.my/88037/1/88037_Mechanical%20properties%2C%20morphology%2C%20and%20hydrolytic.pdf application/pdf en http://irep.iium.edu.my/88037/2/88037_Mechanical%20properties%2C%20morphology%2C%20and%20hydrolytic_WoS.pdf Buys, Yose Fachmi and Ahmad, Mimi Syakina and Anuar, Hazleen and Mahmud, Mudrikah Sofia and Mohd Nasir, Nur Aimi (2020) Mechanical properties, morphology, and hydrolytic degradation behavior of poly lactic acid/thermoplastic polyurethane blends. IIUM Engineering Journal, 21 (1). pp. 193-201. ISSN 1511-788X E-ISSN 2289-7860 https://journals.iium.edu.my/ejournal/index.php/iiumej/article/view/1051/726 10.31436/iiumej.v21i1.1051
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Buys, Yose Fachmi
Ahmad, Mimi Syakina
Anuar, Hazleen
Mahmud, Mudrikah Sofia
Mohd Nasir, Nur Aimi
Mechanical properties, morphology, and hydrolytic degradation behavior of poly lactic acid/thermoplastic polyurethane blends
description Polylactic acid (PLA) has attracted tremendous interest to be utilized as the replacement for petroleum-based polymers as it possesses good biodegradability, can be derived from renewable sources, and shows high mechanical strength. However, its inherent brittleness and low toughness has limited its usage in broader applications. In this work, PLA was melt blended with tough thermoplastic polyurethanes (TPU) in order to produce eco-friendly polymeric materials with balanced mechanical properties. Moreover, the miscibility and the hydrolytic degradation behaviour of PLA/TPU blends were also investigated as it is important to control material degradation behaviour in some applications. Five compositions of specimens, i.e. neat PLA, PLA/TPU 75/25 vol%. PLA/TPU 50/50 vol%, PLA/TPU 25/75 vol%. and neat TPU, were prepared by melt blending PLA with TPU using an internal mixer, followed by compression moulding. Tensile and impact tests were performed to evaluate the mechanical properties. From the tests, it was apparent that the elongation-at-break and impact strength of the blends increased as the TPU content increased. Dynamic Mechanical Analysis (DMA) and Scanning Electron Microscopy (SEM) observation were conducted to evaluate the miscibility of PLA/TPU blends. DMA results of the blends revealed two tangent delta peaks, indicating that the blends were immiscible, and the SEM micrographs supported this trend. Finally, hydrolytic degradation behaviour of PLA, TPU and PLA/TPU blends was investigated by measuring the weight loss after immersion of the specimens in alkaline solution at a predetermined time, i.e. every 24 hours for up to 8 days. It was found that the degradation behaviour is affected by blend composition, where PLA/TPU 50/50 vol% showed the fastest degradation rate. This result might be ascribed to the co-continuous morphology shown in the PLA/TPU blend 50/50 vol%
format Article
author Buys, Yose Fachmi
Ahmad, Mimi Syakina
Anuar, Hazleen
Mahmud, Mudrikah Sofia
Mohd Nasir, Nur Aimi
author_facet Buys, Yose Fachmi
Ahmad, Mimi Syakina
Anuar, Hazleen
Mahmud, Mudrikah Sofia
Mohd Nasir, Nur Aimi
author_sort Buys, Yose Fachmi
title Mechanical properties, morphology, and hydrolytic degradation behavior of poly lactic acid/thermoplastic polyurethane blends
title_short Mechanical properties, morphology, and hydrolytic degradation behavior of poly lactic acid/thermoplastic polyurethane blends
title_full Mechanical properties, morphology, and hydrolytic degradation behavior of poly lactic acid/thermoplastic polyurethane blends
title_fullStr Mechanical properties, morphology, and hydrolytic degradation behavior of poly lactic acid/thermoplastic polyurethane blends
title_full_unstemmed Mechanical properties, morphology, and hydrolytic degradation behavior of poly lactic acid/thermoplastic polyurethane blends
title_sort mechanical properties, morphology, and hydrolytic degradation behavior of poly lactic acid/thermoplastic polyurethane blends
publisher Kulliyyah of Engineering, International Islamic University Malaysia
publishDate 2020
url http://irep.iium.edu.my/88037/1/88037_Mechanical%20properties%2C%20morphology%2C%20and%20hydrolytic.pdf
http://irep.iium.edu.my/88037/2/88037_Mechanical%20properties%2C%20morphology%2C%20and%20hydrolytic_WoS.pdf
http://irep.iium.edu.my/88037/
https://journals.iium.edu.my/ejournal/index.php/iiumej/article/view/1051/726
_version_ 1691732916583792640
score 13.211869

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