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Fabrication and Characterization of Multiscale PLA Structures Using Integrated Rapid Prototyping and Gas Foaming Technologies

1
Institute of Advanced Machine and Design, Seoul National University, Seoul 151-744, Korea
2
Department of Mechanical Engineering, State University of New York, Stony Brook, NY 11794, USA
3
School of Chemical and Biological Engineering, Institute of Chemical Process, Seoul National University, Seoul 151-744, Korea
*
Authors to whom correspondence should be addressed.
Current Address: Research Institute of Advance Materials, Seoul National University, Seoul 151-744, Korea.
Nanomaterials 2018, 8(8), 575; https://doi.org/10.3390/nano8080575
Received: 12 June 2018 / Revised: 18 July 2018 / Accepted: 25 July 2018 / Published: 27 July 2018
(This article belongs to the Special Issue Nanomaterials for Renewable and Sustainable Energy)
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Abstract

Multiscale structured polymers have been considered as a promising category of functional materials with unique properties. We combined rapid prototyping and gas foaming technologies to fabricate multiscale functional materials of superior mechanical and thermal insulation properties. Through scanning electron microscope based morphological characterization, formation of multiscale porous structure with nanoscale cellular pores was confirmed. Improvement in mechanical strength is attributed to rearrangement of crystals within CO2 saturated grid sample. It is also shown that a post-foaming temperature higher than the glass transition temperature deteriorates mechanical strength, providing process guidelines. Thermal decomposition of filament material sets the upper limit of temperature for 3D printed features, characterized by simultaneous differential scanning calorimetry and thermogravimetric analysis. Porosity of the fabricated 3D structured polylactic acid (PLA) foam is controllable by suitable tuning of foaming conditions. The fabricated multiscale 3D structures have potential for thermal insulation applications with lightweight and reasonable mechanical strength. View Full-Text
Keywords: multiscale structure; rapid prototyping; nanofoam; gas foaming; polylactic acid multiscale structure; rapid prototyping; nanofoam; gas foaming; polylactic acid
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Park, B.K.; Hwang, D.J.; Kwon, D.E.; Yoon, T.J.; Lee, Y.-W. Fabrication and Characterization of Multiscale PLA Structures Using Integrated Rapid Prototyping and Gas Foaming Technologies. Nanomaterials 2018, 8, 575.

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