The performance of gamma irradiation and pineapple-derived nanocellulose for advanced PLA/PBAT materials
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Duclerc Fernandes Parra
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This study presents an innovative approach to addressing the challenges of phase immiscibility and poor interfacial adhesion in polylactic acid (PLA) and poly(butylene adipate-co-terephthalate) (PBAT) blends by integrating gamma radiation-induced modifications and with nanocellulose reinforcement, offering a novel option to high-performance, eco-friendly materials that balance sustainability with functionality. Cellulose nanocrystals (CNCs) and cellulose nanofibrils (CNFs) were extracted from pineapple leaf fibers (PALF), which contain 50.5% cellulose, demonstrating their potential as a valuable source for nanocellulose production. Optimized hydrolysis conditions (55% H2SO4, 45ºC, 20-50 mg/mL) yielded CNCs with high crystallinity and minimal thermal degradation, achieving yields of 55-61%. Conversely, CNFs processed via ball milling for 196-360 hours exhibited disrupted crystallinity and aggregated structures, reclassified as cellulose nanoparticles (CNPs). Gamma irradiation using Co-60 was applied to induce chain scission in PLA, enhancing its interaction with PBAT through free radical formation. High doses (80-150 kGy) caused excessive degradation, reducing mechanical properties despite improved interfacial adhesion. In contrast, low doses (3-5 kGy) significantly improved mechanical properties (7.7% increase in tensile strength for 3 kGy, 12.9% increase in elongation at break for 5 kGy) and thermal stability (5.3ºC increase) while preserving rheological and viscoelastic characteristics. Incorporating 1-3% CNP into high-dose irradiated blends did not enhance mechanical or rheological properties due to material degradation and low fibrillation but improved thermal stability and crystallinity in non-irradiated blends. Environmental implications were significant, as gamma irradiation and nanocellulose incorporation accelerated biodegradability, making these blends suitable for sustainable packaging applications.
Como referenciar
COSTA, FERNANDA A.T. da. The performance of gamma irradiation and pineapple-derived nanocellulose for advanced PLA/PBAT materials. Orientador: Duclerc Fernandes Parra. Coorientador: Alain Dufresne. 2025. 265 f. Tese (Doutorado em Tecnologia Nuclear) - Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP, São Paulo. DOI: 10.11606/T.85.2025.tde-18112025-151515. Disponível em: https://repositorio.ipen.br/handle/123456789/49542. Acesso em: 09 Apr 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.