Pure Hydrolysis of Polyamides: A Comparative Study
Polyamides (PAs) undergo local environmental degradation, leading to a decline in their mechanical properties over time. PAs can experience various forms of degradation, such as thermal degradation, oxidation, hydrothermal oxidation, UV oxidation, and hydrolysis. In order to better comprehend the de...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-12-01
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| Series: | Chemistry |
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| Online Access: | https://www.mdpi.com/2624-8549/6/1/2 |
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| author | Mathis Mortensen Brette Allan Hjarbæk Holm Aleksey D. Drozdov Jesper de Claville Christiansen |
| author_facet | Mathis Mortensen Brette Allan Hjarbæk Holm Aleksey D. Drozdov Jesper de Claville Christiansen |
| author_sort | Mathis Mortensen Brette |
| collection | DOAJ |
| description | Polyamides (PAs) undergo local environmental degradation, leading to a decline in their mechanical properties over time. PAs can experience various forms of degradation, such as thermal degradation, oxidation, hydrothermal oxidation, UV oxidation, and hydrolysis. In order to better comprehend the degradation process of PAs, it is crucial to understand each of these degradation mechanisms individually. While this review focuses on hydrolysis, the data from degrading similar PAs under pure thermal oxidation and/or hydrothermal oxidation are also collected to grasp more perspective. This review analyzes the available characterization data and evaluates the changes in molecular weight, crystallinity, chemical structure, and mechanical properties of PAs that have aged in oxygen-free water at high temperatures. The molecular weight and mechanical strength decrease as the crystallinity ratio rises over aging time. This development is occurring at a slower rate than degradation in pure thermal oxidation. By combining the data for the changes in mechanical properties with the ones for molecular weight and crystallinity, the point of embrittlement can be not only predicted, but also modeled. This prediction is also shown to be dependent on the fibers, additives, types of PA, pH, and more. |
| first_indexed | 2024-03-07T22:37:25Z |
| format | Article |
| id | doaj.art-2baed6d0061a4bab8d8e16a6d0ed3803 |
| institution | Directory Open Access Journal |
| issn | 2624-8549 |
| language | English |
| last_indexed | 2024-03-07T22:37:25Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Chemistry |
| spelling | doaj.art-2baed6d0061a4bab8d8e16a6d0ed38032024-02-23T15:12:05ZengMDPI AGChemistry2624-85492023-12-0161135010.3390/chemistry6010002Pure Hydrolysis of Polyamides: A Comparative StudyMathis Mortensen Brette0Allan Hjarbæk Holm1Aleksey D. Drozdov2Jesper de Claville Christiansen3Department of Materials and Production, Aalborg University, Fibigerstræde 16, 9220 Aalborg, DenmarkGrundfos A/S (Danske Salgsselskab), Martin Bachs Vej 3, 8850 Bjerringbro, DenmarkDepartment of Materials and Production, Aalborg University, Fibigerstræde 16, 9220 Aalborg, DenmarkDepartment of Materials and Production, Aalborg University, Fibigerstræde 16, 9220 Aalborg, DenmarkPolyamides (PAs) undergo local environmental degradation, leading to a decline in their mechanical properties over time. PAs can experience various forms of degradation, such as thermal degradation, oxidation, hydrothermal oxidation, UV oxidation, and hydrolysis. In order to better comprehend the degradation process of PAs, it is crucial to understand each of these degradation mechanisms individually. While this review focuses on hydrolysis, the data from degrading similar PAs under pure thermal oxidation and/or hydrothermal oxidation are also collected to grasp more perspective. This review analyzes the available characterization data and evaluates the changes in molecular weight, crystallinity, chemical structure, and mechanical properties of PAs that have aged in oxygen-free water at high temperatures. The molecular weight and mechanical strength decrease as the crystallinity ratio rises over aging time. This development is occurring at a slower rate than degradation in pure thermal oxidation. By combining the data for the changes in mechanical properties with the ones for molecular weight and crystallinity, the point of embrittlement can be not only predicted, but also modeled. This prediction is also shown to be dependent on the fibers, additives, types of PA, pH, and more.https://www.mdpi.com/2624-8549/6/1/2hydrolysispolyamideagingdegradationcrystallizationembrittlement |
| spellingShingle | Mathis Mortensen Brette Allan Hjarbæk Holm Aleksey D. Drozdov Jesper de Claville Christiansen Pure Hydrolysis of Polyamides: A Comparative Study Chemistry hydrolysis polyamide aging degradation crystallization embrittlement |
| title | Pure Hydrolysis of Polyamides: A Comparative Study |
| title_full | Pure Hydrolysis of Polyamides: A Comparative Study |
| title_fullStr | Pure Hydrolysis of Polyamides: A Comparative Study |
| title_full_unstemmed | Pure Hydrolysis of Polyamides: A Comparative Study |
| title_short | Pure Hydrolysis of Polyamides: A Comparative Study |
| title_sort | pure hydrolysis of polyamides a comparative study |
| topic | hydrolysis polyamide aging degradation crystallization embrittlement |
| url | https://www.mdpi.com/2624-8549/6/1/2 |
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