3D printed remendable polylactic acid blends with uniform mechanical strength enabled by a dynamic Diels-Alder reaction

Gayan A. Appuhamillage, John C. Reagan, Sina Khorsandi, Joshua R. Davidson, Walter Voit, Ronald A. Smaldone

Research output: Contribution to journalArticle

Abstract

Here we report a 3D printable polymer that retains uniform mechanical strength after printing and can be used with a conventional fused filament fabrication (FFF) printer. To achieve this, a synthetic polymer containing dynamic Diels-Alder functionality was blended with commercially available polylactic acid (PLA). This new polymer contains cross-links that are reversible at the temperatures typically used for FFF 3D printers. By increasing the cross-link density of the polymer system, we were able to dramatically improve both ultimate strength and toughness along the interfilament junctions of the printed material up to ∼290% and ∼1150% respectively. The final achieved ultimate strength and toughness values for the optimized system are isotropic within error along the three representative print directions X, Y, and Z. Self-healing studies on the Z print direction of the optimized blend showed a 77% recovery of the ultimate strength vs. control PLA having only a 6% recovery, further proving the advanced interfilamentous adhesion via the fmDA dynamics.

Original languageEnglish (US)
Pages (from-to)2087-2092
Number of pages6
JournalPolymer Chemistry
Volume8
Issue number13
DOIs
StatePublished - Apr 7 2017

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Polymers
Cycloaddition Reaction
Acids
Toughness
Strength of materials
Fabrication
Recovery
3D printers
Printing
Adhesion
Temperature
Three Dimensional Printing

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Biomedical Engineering
  • Polymers and Plastics
  • Organic Chemistry

Cite this

3D printed remendable polylactic acid blends with uniform mechanical strength enabled by a dynamic Diels-Alder reaction. / Appuhamillage, Gayan A.; Reagan, John C.; Khorsandi, Sina; Davidson, Joshua R.; Voit, Walter; Smaldone, Ronald A.

In: Polymer Chemistry, Vol. 8, No. 13, 07.04.2017, p. 2087-2092.

Research output: Contribution to journalArticle

Appuhamillage, Gayan A.; Reagan, John C.; Khorsandi, Sina; Davidson, Joshua R.; Voit, Walter; Smaldone, Ronald A. / 3D printed remendable polylactic acid blends with uniform mechanical strength enabled by a dynamic Diels-Alder reaction.

In: Polymer Chemistry, Vol. 8, No. 13, 07.04.2017, p. 2087-2092.

Research output: Contribution to journalArticle

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