| Title: | Hydrothermal decomposition of virgin and waste polylactic acid with subcritical water under N[sub]2 and air atmospheres |
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| Authors: | ID Čolnik, Maja (Author)
ID Irgolič, Mihael (Author)
ID Škerget, Mojca (Author) |
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| Files: |  1-s2.0-S0142941825000972-main.pdf (3,22 MB)
MD5: 0DA78AE25934DF43B462BAFE11BD6851
 https://www.sciencedirect.com/science/article/pii/S0142941825000972?via%3Dihub#da0010
S0142941825000972.htm (170,70 KB)
MD5: F574C603622FE7BA77156599A1FCE427
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| Language: | English |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FKKT - Faculty of Chemistry and Chemical Engineering
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| Abstract: | This study addresses the inherent shortcomings of poly (lactic acid) (PLA), a biodegradable polymer widely used in industries such as packaging and biomedical applications. The principal challenge of PLA resides in its low crystallinity, which detrimentally affects its mechanical properties and thermal stability. Additionally, PLA is prone to water and hydrolysis, which compromises its chemical resistance and can lead to degradation over time. To overcome surmount these limitations, the study focuses on the development of hybrid films through the blending of PLA with poly (l-lactide-co-ethylene adipate) (pLEA) block copolymers. The objective is to augment the crystallinity, mechanical performance, and chemical resistance of the resulting materials. The study employs a range of analytical techniques, including Nuclear Magnetic Resonance (NMR), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Polarised Light Microscopy (PLM), Differential Scanning Calorimetry (DSC), and Thermogravimetric Analysis (TGA), to thoroughly characterize the copolymers and blend films. By systematically selecting blending ratios and processing methodologies, the study demonstrates enhancements in the properties of the resultant hybrid films compared to neat PLA. Specifically, the structure of films significantly changed from amorphous to crystalline in a short duration - 5 min, of annealing., leading to better tensile strength, modulus and reduced wettability, which are crucial for applications requiring durability and resistance to environmental factors. Films made from 30 wt% of pLEA 97.5/2.5 with 70 % of PLA by fast cooling exhibited outstanding mechanical properties, with a tensile strength 20 MPa higher than that of neat PLA films. Additionally, the chemical resistance may be improved, as evidenced by a decrease in wettability by approximately 15° and a reduction in the polar component of the surface free energy by about 7 mN/m. Hydrophobic, water-repellent materials resist penetration by water and other polar solvents, reducing exposure to corrosive substances and enhancing chemical resistance through barrier protection. Overall, this research addresses the limitations of PLA through innovative copolymerization and blending strategies, offering valuable insights into optimizing the material's properties for various practical applications. |
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| Keywords: | biopolymers recycling, polylactic acid, subcritical water, lactic acid, carboxylic acids, gaseous products |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 04.02.2025 |
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| Article acceptance date: | 27.03.2025 |
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| Publication date: | 27.03.2025 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2025 |
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| Number of pages: | 11 str. |
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| Numbering: | Vol. 146, [article no.] 108783 |
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| PID: | 20.500.12556/DKUM-92358  |
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| UDC: | 543.2 |
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| ISSN on article: | 1873-2348 |
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| COBISS.SI-ID: | 230943491 |
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| DOI: | 10.1016/j.polymertesting.2025.108783 |
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| Copyright: | © 2025 The Authors |
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| Publication date in DKUM: | 01.04.2025 |
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| Views: | 230 |
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| Downloads: | 18 |
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| Metadata: |    |
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| Categories: | Misc.
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