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Issue 13, 2017
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3D printed remendable polylactic acid blends with uniform mechanical strength enabled by a dynamic Diels–Alder reaction

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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.

Graphical abstract: 3D printed remendable polylactic acid blends with uniform mechanical strength enabled by a dynamic Diels–Alder reaction

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Publication details

The article was received on 23 Feb 2017, accepted on 14 Mar 2017 and first published on 15 Mar 2017


Article type: Paper
DOI: 10.1039/C7PY00310B
Citation: Polym. Chem., 2017,8, 2087-2092
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    3D printed remendable polylactic acid blends with uniform mechanical strength enabled by a dynamic Diels–Alder reaction

    G. A. Appuhamillage, J. C. Reagan, S. Khorsandi, J. R. Davidson, W. Voit and R. A. Smaldone, Polym. Chem., 2017, 8, 2087
    DOI: 10.1039/C7PY00310B

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