Polymer Photodegradation Followed by Infrared: A Tutorial
Since the first scientific study published by August Wilhelm Hofmann at 1861, where he found the role of oxygen in the degradation of weathered materials, a lot of progress has been made regarding the understanding of the mechanisms that lead to the polymer degradation. In this work, it was proposed...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | Brasil |
| Institución: | Universidade Estadual Paulista (UNESP) |
| Repositorio: | Repositório Institucional da UNESP |
| Idioma: | portugués |
| OAI Identifier: | oai:repositorio.unesp.br:11449/210531 |
| Acceso en línea: | http://dx.doi.org/10.21577/1984-6835.20200077 http://hdl.handle.net/11449/210531 |
| Access Level: | acceso abierto |
| Palabra clave: | Polypropylene photochemical degradation carbonyl index oxidation radical reactions |
| Sumario: | Since the first scientific study published by August Wilhelm Hofmann at 1861, where he found the role of oxygen in the degradation of weathered materials, a lot of progress has been made regarding the understanding of the mechanisms that lead to the polymer degradation. In this work, it was proposed a protocol to study the photochemical degradation of polymers using as probes the absorption of hydroxyl, carbonyl, and vinyl, as followed by the infrared spectroscopy. As a result, it is possible to assess the evolution of the chemical groups associated with the polymer degradation comparing the absorption as a function of degradation time, for films with the same thickness, or comparing the absorption of the chemical groups associated with the polymer degradation related to a reference band, for polymer or pieces with different thicknesses. We discuss also the general mechanism of photodegradation for polyolefins; the difference between using the area of the band vs the intensity of the peak; and the construction of a lab-made ageing chamber, and the role of each part. |
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