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2020 Vol.52, Issue 3 Preview Page
Changes in Properties of 3D Printing Filaments by Extruding at Different Temperatures and Lignin Contents

사출 온도 및 리그닌 함량에 따른 3D 프린터용 필라멘트의 특성 평가

Ji-Ae Ryu1
,
Sa Rang Choi2
,
Ji-Soo Park3
,
Ji-Hyo Ahn3
,
Jung Myoung Lee4†
류지애 1
,
최사랑 2
,
박지수 3
,
안지효 3
,
이중명 4†
1Agricultural Science and Technology Research Institute, Kyungpook National University
2Department of Wood Science and Technology, Kyungpook National University
3Major in Wood Science and Technology, Dept. of Wood Science and Technology, School of Forestry, Science and Landscape Architecture, Kyungpook National University
4Major in Wood Science and Technology, Dept. of Wood Science and Technology, School of Forestry, Science and Landscape Architecture & Agricultural Science and Technology Research Institute, Kyungpook National University
1경북대학교 농업과학기술연구소, 연구원
2경북대학교 임산공학과, 학생
3경북대학교 산림과학·조경학부 임산공학전공, 학생
4경북대학교 산림과학·조경학부 임산공학전공 및 농업과학기술연구소, 교수
†Corresponding author: E-Mail: jmylee@knu.ac.kr (Address: Major in Wood Science and Technology, Dept. of Wood Science and Technology, School of Forestry, Science and Landscape Architecture & Agricultural Science and Technology Research Institute, Kyungpook National University, Daegu, 41566, Republic of Korea)
30 June 2020. pp. 120-128
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Abstract

Technical lignin can be used as a plasticizer to provide thermal stability to a material and to facilitate thermal processing. To evaluate the effects of organosolv lignin in polylactic acid (PLA) in this study, we analyzed the performance of 3D printing filaments extruded using different lignin contents and process temperatures. Based on the fracture surface of the fabricated filaments, the fine cracks present in the cross section of the filament decreased as the lignin contents in the PLA and the extruding temperature increased from 150°C to 160°C. However, the mechanical properties of the filament were different at 150°C. When extruded at 150°C without additions of lignin, the neat PLA did not melt completely, resulting in a poor strength performance. Additions of lignin with PLA at the same temperature increased the strength of the filaments owing to heterogeneous nucleation. However, upon increasing to 155℃ and 160℃, neat PLA had more crystalline substances so that lignin and heterogeneous nucleation instead acted as a weak point for the strength performance. As the lignin content increased, the glass transition point (Tg), crystallization temperature (Tcc), and melting point (Tm) decreased for all temperature conditions evaluated. As the amorphous material was mixed with lignin, the thermal properties of the filament were changed by creating heterogeneous nucleation between the lignin and PLA matrix; however, rapid changes in the Tcc were observed at the 150°C extruding temperature. Because of this dramatic thermal fluctuation, more heterogeneous nucleation occurred, causing changes in the mechanical properties of the filament.

Keywords
Lignin
polylactic acid (PLA)
extrude temperature
3D print filament
filament tensile strength
thermal properties
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Information
  • Publisher :Korea Technical Association of The Pulp and Paper Industry
  • Publisher(Ko) :한국펄프종이공학회
  • Journal Title :Journal of Korea TAPPI
  • Journal Title(Ko) :펄프종이기술
  • Volume : 52
  • No :3
  • Pages :120-128
  • Received Date : 2020-05-25
  • Revised Date : 2020-06-12
  • Accepted Date : 2020-06-16
  • DOI :https://doi.org/10.7584/JKTAPPI.2020.06.52.3.120
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