Data/hora: 02/06/2024 17:43:53

Biblioteca(s): 	Embrapa Instrumentação.	
Data corrente: 	08/11/2021	
Data da última atualização: 	22/11/2022	
Autoria: 	REIS, I. A.; CLARO, P. I. C.; MARCOMINI, A. L.; MATTOSO, L. H. C.; SILVA, S. P. da; SENA NETO, A. R. de.	
Afiliação: 	LUIZ HENRIQUE CAPPARELLI MATTOSO, CNPDIA.	
Título: 	Annealing and crystallization kinetics of poly(lactic acid) pieces obtained by additive manufacturing.	
Ano de publicação: 	2021	
Fonte/Imprenta: 	Polymer Engineering Science, v. 61, 2021.	
Páginas: 	2097-2104	
ISSN: 	1548-2634	
DOI: 	10.1002/pen.25737	
Idioma: 	Inglês	
Conteúdo: 	In this study, we investigated the influence of isothermal treatment of poly(lactic acid) (PLA) 3D printed samples at different crystallization temperatures. In this case, we analyzed the effect of each crystallization temperature on spherulites formation in printed PLA, affecting the final mechanical properties of pieces. For such, the thermomechanical properties, morphological structure, and crystallization kinetics were analyzed before and after thermal treatment. The 3D printed samples were heat treated at 80#1;C, 90#1;C, 100#1;C, 110#1;C, and 119#1;C. With annealing, we observed an improvement in the mechanical PLA properties; however, the exothermic crystallization peak was different for the samples. Pieces before annealing were found to have a low crystallinity index (Ic) of 2%–7%, and the pieces after annealing presented a considerable Ic (27%–34%). Annealing temperatures of 100#1;C, 110#1;C, and 119#1;C produced the fastest crystallization kinetics, while annealing temperatures of 80#1;C and 90#1;C resulted in the lowest crystallization kinetics for complete crystallization. After annealing, improvement in the flexural strength (34%–47%) and Young's modulus (26%–51%) for all annealed pieces occurred. The appropriate condition was observed at 100#1;C, which was the onset temperature of crystallization, owing to the combination of the shorter time of crystallization with the increased mechanical properties	
Palavras-Chave: 	Crystallization kinetics; Filament structure-property relations; Thermal annealing.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Instrumentação (CNPDIA)	
Exemplares: 	CNPDIA - (17900-1) - UPC - AP - DD - PROCI.21/146 -  - 2021/150 - DIS