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Mechanochromic composite elastomers for additive manufacturing and low strain mechanophore activation

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Abstract

Herein, we report a strategy for additive manufacturing of a mechanochemically active silicone ink primarily composed of PDMS microbeads. Extruded, stable structures of cured microbeads were held together with a “bridging material” comprising uncured PDMS and spiropyran in a water medium. The mechanochromic silicone ink was a shear-thinning gel that exhibited a yield stress, and thus, was suitable for direct-write 3D printing. The spiropyran was stable to mild conditions of the printing process, and after a thermal curing step, the printed silicone displayed reversible mechanochromic activity. The extruded composite displays chromophore activation at lower mechanical strains under uniaxial tension (60–70%) than in a film without the microbeads (130–140%). Multi-layered 3D printed constructs were fabricated and displayed mechanochromic activity in tension and compression. These experiments demonstrate the versatility of these silicone inks to produce 3D printed functional elastomers with mechanochemical activity.

Graphical abstract: Mechanochromic composite elastomers for additive manufacturing and low strain mechanophore activation

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Publication details

The article was received on 16 Jul 2019, accepted on 10 Sep 2019 and first published on 18 Sep 2019


Article type: Paper
DOI: 10.1039/C9PY01053J
Polym. Chem., 2019, Advance Article

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    Mechanochromic composite elastomers for additive manufacturing and low strain mechanophore activation

    R. C. Rohde, A. Basu, L. B. Okello, M. H. Barbee, Y. Zhang, O. D. Velev, A. Nelson and S. L. Craig, Polym. Chem., 2019, Advance Article , DOI: 10.1039/C9PY01053J

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