Effect of protective coatings on the water absorption and mechanical properties of 3D printed PLA

Carlos M. S. Vicente; João H. Fernandes; Luís Reis; Augusto Moita de Deus; M. F. Vaz; Marco Leite

doi:10.3221/IGF-ESIS.48.68

Effect of protective coatings on the water absorption and mechanical properties of 3D printed PLA

Carlos M. S. Vicente, João H. Fernandes, Luís Reis, Augusto Moita de Deus, M. F. Vaz, Marco Leite

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

This work aims to study the influence of protective coatings on the water absorption and mechanical properties of 3D printed poly–lactic acid (PLA) parts. The PLA parts were fabricated with different levels of the 3D printing process parameters, aiming to define samples with distinct strength and ductility/toughness characteristics. Water absorption tests following the standard ASTM D570–98 were performed on uncoated and coated PLA specimens. The effectiveness of two protective coatings based on acrylic and polyurethane varnish on reducing water absorption was evaluated. Both protective coatings have shown being effective on preventing water absorption by the PLA, with polyurethane presenting the best performance reducing water absorption by 38%. Tensile tests were carried out to determine the ultimate tensile strength, elastic modulus, yield tensile strength, fracture strain and toughness of specimens, before and after the application of protective coatings. The polyurethane protective coating also benefits the tensile properties of PLA parts, increasing the strength and ductility/toughness characteristics of specimens up to 24%.

Original language	English
Pages (from-to)	748-756
Number of pages	9
Journal	Frattura ed Integrita Strutturale
Volume	13
Issue number	48
DOIs	https://doi.org/10.3221/IGF-ESIS.48.68
Publication status	Published - 1 Apr 2019

Keywords

3D printing
Mechanical properties
PLA
Printing parameters
Water absorption

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10.3221/IGF-ESIS.48.68Licence: CC BY

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title = "Effect of protective coatings on the water absorption and mechanical properties of 3D printed PLA",

abstract = "This work aims to study the influence of protective coatings on the water absorption and mechanical properties of 3D printed poly–lactic acid (PLA) parts. The PLA parts were fabricated with different levels of the 3D printing process parameters, aiming to define samples with distinct strength and ductility/toughness characteristics. Water absorption tests following the standard ASTM D570–98 were performed on uncoated and coated PLA specimens. The effectiveness of two protective coatings based on acrylic and polyurethane varnish on reducing water absorption was evaluated. Both protective coatings have shown being effective on preventing water absorption by the PLA, with polyurethane presenting the best performance reducing water absorption by 38%. Tensile tests were carried out to determine the ultimate tensile strength, elastic modulus, yield tensile strength, fracture strain and toughness of specimens, before and after the application of protective coatings. The polyurethane protective coating also benefits the tensile properties of PLA parts, increasing the strength and ductility/toughness characteristics of specimens up to 24%.",

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note = "This work was supported by Fundacao para a Ciencia e Tecnologia (FCT), through IDMEC, under LAETA project, UID/EMS/50022/2019. The authors also gratefully acknowledge the funding of FIBR3D project, Reference SAICTPAC/0036/2015, financed by European Structural and Investment Funds (ESIFs) through the Lisbon Regional Operational Programme 2020 and by FCT national funds, POCI-01-0145-FEDER-016414. Marco Leite acknowledges the FCT funding through UNIDEMI project UID/EMS/00667/2019. Carlos M. S. Vicente acknowledge the FIBR3D project, reference SAICTPAC/0036/2015, for the post-doctoral research grant.",

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N2 - This work aims to study the influence of protective coatings on the water absorption and mechanical properties of 3D printed poly–lactic acid (PLA) parts. The PLA parts were fabricated with different levels of the 3D printing process parameters, aiming to define samples with distinct strength and ductility/toughness characteristics. Water absorption tests following the standard ASTM D570–98 were performed on uncoated and coated PLA specimens. The effectiveness of two protective coatings based on acrylic and polyurethane varnish on reducing water absorption was evaluated. Both protective coatings have shown being effective on preventing water absorption by the PLA, with polyurethane presenting the best performance reducing water absorption by 38%. Tensile tests were carried out to determine the ultimate tensile strength, elastic modulus, yield tensile strength, fracture strain and toughness of specimens, before and after the application of protective coatings. The polyurethane protective coating also benefits the tensile properties of PLA parts, increasing the strength and ductility/toughness characteristics of specimens up to 24%.

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Effect of protective coatings on the water absorption and mechanical properties of 3D printed PLA

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