Printability, Mechanical and Thermal Properties of Poly(3-Hydroxybutyrate)-Poly(Lactic Acid)-Plasticizer Blends for Three-Dimensional (3D) Printing

Autor: Matyáš Horálek, Radek Přikryl, Soňa Kontárová, Veronika Melčová, Silvestr Figalla, Přemysl Menčík, Jiří Sadílek, Aneta Pospisilova, Jozef Feranc, Roderik Plavec
Rok vydání: 2020
Předmět:
plasticizers
Materials science
printability
biodegradable polymeric blends
Plastics extrusion
02 engineering and technology
010402 general chemistry
01 natural sciences
lcsh:Technology
Article
law.invention
chemistry.chemical_compound
Differential scanning calorimetry
law
citrates
Ultimate tensile strength
Heat deflection temperature
General Materials Science
Composite material
lcsh:Microscopy
lcsh:QC120-168.85
Rheometry
Fused deposition modeling
lcsh:QH201-278.5
lcsh:T
Plasticizer
3D printing
021001 nanoscience & nanotechnology
poly(ethylene glycol) PEG
poly(hydroxybutyrate)-poly(lactic)
0104 chemical sciences
chemistry
lcsh:TA1-2040
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
0210 nano-technology
lcsh:Engineering (General). Civil engineering (General)
Ethylene glycol
lcsh:TK1-9971
Zdroj: Materials
Volume 13
Issue 21
Materials, Vol 13, Iss 4736, p 4736 (2020)
Materials . 2020, vol. 13, issue 21, p. 1-27.
ISSN: 1996-1944
Popis: This paper investigates the effect of plasticizer structure on especially the printability and mechanical and thermal properties of poly(3-hydroxybutyrate)-poly(lactic acid)-plasticizer biodegradable blends. Three plasticizers, acetyl tris(2-ethylhexyl) citrate, tris(2-ethylhexyl) citrate, and poly(ethylene glycol)bis(2-ethylhexanoate), were first checked whether they were miscible with poly(3-hydroxybutyrate)-poly(lactic acid) (PHB-PLA) blends using a kneading machine. PHB-PLA-plasticizer blends of 60-25-15 (wt.%) were then prepared using a corotating meshing twin-screw extruder, and a single screw extruder was used for filament preparation for further three-dimensional (3D) fused deposition modeling (FDM) printing. These innovative eco-friendly PHB-PLA-plasticizer blends were created with a majority of PHB, and therefore, poor mechanical properties and thermal properties of neat PHB-PLA blends were improved by adding appropriate plasticizer. The plasticizer also influences the printability of blends, which was investigated, based on our new specific printability tests developed for the optimization of printing conditions (especially printing temperature). Three-dimensional printed test samples were used for heat deflection temperature measurements and Charpy and tensile-impact tests. Plasticizer migration was also investigated. The macrostructure of 3D printed samples was observed using an optical microscope to check the printing quality and printing conditions. Tensile tests of 3D printed samples (dogbones), as well as extruded filaments, showed that measured elongation at break raised, from 21% for non-plasticized PHB-PLA reference blends to 84% for some plasticized blends in the form of filaments and from 10% (reference) to 32% for plasticized blends in the form of printed dogbones. Measurements of thermal properties (using modulated differential scanning calorimetry and oscillation rheometry) also confirmed the plasticizing effect on blends. The thermal and mechanical properties of PHB-PLA blends were improved by the addition of appropriate plasticizer. In contrast, the printability of the PHB-PLA reference seems to be slightly better than the printability of the plasticized blends.
Databáze: OpenAIRE
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