| Texto completo | |
| Autor(es): |
Gonzaga, Graziela L.
;
Babetto, Alex S.
;
Goncalves, Livia M. G.
;
Bettini, Silvia H. P.
;
Souza, Adriana M. C.
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | POLYMER ENGINEERING AND SCIENCE; v. 64, n. 6, p. 12-pg., 2024-03-20. |
| Resumo | |
In this study, the biodegradation behavior in the soil of natural and pigmented poly (lactic acid) (PLA) plates obtained by three-dimensional (3D) printing or by compression molding was evaluated by the respirometry method at three different temperatures: 21, 28, and 35 degrees C. PLA samples before and after aerobic biodegradation tests were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TG), and size exclusion chromatography analysis. The increase in test temperature enhanced the biodegradation process. At a test temperature of 35 degrees C, the maximum biodegradation rates of natural PLA and pigmented PLA were 65% and 68% higher, respectively, compared to the maximum biodegradation rate observed at 21 degrees C. DSC and TG analysis indicate that pigmented PLA samples were more susceptible to degradation by hydrolysis. However, the rate of biodegradation efficiency was lower in pigmented PLA samples, with a decrease of 16%, 24%, and 14% at 21, 28, and 35 degrees C, respectively, compared to natural PLA. This behavior indicated that pigment hindered the hydrolysis by-products absorption by microorganisms. Additionally, the presence of micro voids in PLA samples obtained through 3D printing accelerated the rate of biodegradation efficiency by 32% at 28 degrees C compared to pressed samples.Highlights Poly (lactic acid) (PLA) plate biodegradation in soil was analyzed using respirometry method. Temperature, pigment presence, and sample preparation method were considered. Higher temperatures enhanced both natural and pigmented PLA biodegradation. Pigments appeared to act as antimicrobial agents, slowing down the process. Water presence in the micro voids accelerated hydrolysis and biodegradation. Cumulative CO2 evolved as a function of time for cellulose, natural 3D-printed or pressed PLA, and pigmented 3D-printed PLA at 28 degrees C image (AU) | |
| Processo FAPESP: | 20/07633-2 - Extensão de cadeia de poli(ácido láctico) visando a produção de espumas por SSP e processamento reativo |
| Beneficiário: | Silvia Helena Prado Bettini |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 11/21313-1 - Estudo da cinética de reação e da adição de desativadores de metais na graftização de anidrido maleico em polipropileno, na presença e ausência de nanopartículas |
| Beneficiário: | Silvia Helena Prado Bettini |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |