| Texto completo | |
| Autor(es): Mostrar menos - |
Gimenez, Jessica Caroline Ferreira
;
Bonatti, Sophia Helena Felisbino
;
Basaglia, Marcos Vinicius
;
Garcia, Rodrigo Henrique Dos Santos
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Dos Santos, Alef
;
Staffa, Lucas Henrique
;
Samara, Mazen
;
Bettini, Silvia Helena Prado
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De Azevedo, Eduardo Ribeiro
;
Helal, Emna
;
Demarquette, Nicole Raymonde
;
Homem, Manoel Gustavo Petrucelli
;
Cruz, Sandra Andrea
Número total de Autores: 13
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| Tipo de documento: | Artigo Científico |
| Fonte: | POLYMERS; v. 17, n. 20, p. 18-pg., 2025-10-11. |
| Resumo | |
UV-C radiation has emerged as a germicidal agent against pathogens, particularly following the COVID-19 pandemic. While UV-C effectively reduces cross-contamination in hospitals, it induces photodegradation in polymer devices, potentially damaging and posing risks to patient safety. Therefore, it is crucial to detect the effects of UV-C photodegradation on early stages, as well as the effects of prolonged UV-C exposure. In this study, we investigated the UV-C photodegradation (254 nm, 471 kJ/mol) of isotactic polypropylene homopolymer (PP), commonly used in medication packaging. The impact of UV-C on PP was evaluated through rheology and infrared spectroscopy. Surface energy was measured by the contact angles formed by drops of water and diiodomethane. The effects of photodegradation on the polymer's morphology were examined using scanning electron microscopy, and the melting temperature and crystallinity by differential scanning calorimetry. Lastly, the effect of UV-C on molecular mobility was studied using H-1 Time Domain Nuclear Magnetic Resonance (H-1 TD-NMR). These techniques proved to be valuable tools for identifying the early stages of UV-C photodegradation, and H-1 TD-NMR was a sensitive method to identify the chain branching as a photodegradation product. This study highlights the impact of UV-C on PP photodegradation and hence the importance of understanding UV-C-induced degradation. (AU) | |
| Processo FAPESP: | 16/25703-2 - Polipropileno reciclado para contato com alimento: emprego de filmes de a-C:H depositados por plasma e degradação na presença de contaminantes |
| Beneficiário: | Sandra Andrea Cruz |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |