Issue 3, 2023

4D printing of light activated shape memory polymers with organic dyes

Abstract

Light based 3D printing technologies, such as digital light processing (DLP), allow for the additive manufacturing of complex 3D objects at fast speeds and with high resolution. Typical printable formulations for DLP consist of (a mixture of) monomer(s), a photoinitiator and very often, an organic dye absorbing at the printing wavelength in order to improve the resolution. Herein, we exploit the use of push–pull azobenzene (azo) dyes to not only enhance printing resolution but also to enable light response (fourth-dimension) of printed shape memory polymers (SMPs) employing DLP without the necessity of adding inorganic additives. In particular, a library of azo-dyes with different substituents in ortho-position have been synthesized and added as active dyes in the printing formulation. The light activated shape memory effect is demonstrated for all the printed structures including the dyes. Among all of them, the structures containing chlorine-substituted azo dyes show the best performance. Importantly, the desired effect is achieved with only 0.1 wt% of dye in the formulation. Furthermore, we demonstrate the potential of using visible light as stimulus for spatially resolved activation of complex structures on demand.

Graphical abstract: 4D printing of light activated shape memory polymers with organic dyes

Supplementary files

Article information

Article type
Paper
Submitted
30 Sep 2022
Accepted
31 Oct 2022
First published
02 Nov 2022

Mol. Syst. Des. Eng., 2023,8, 323-329

4D printing of light activated shape memory polymers with organic dyes

M. Gastaldi, C. A. Spiegel, C. Vazquez-Martel, C. Barolo, I. Roppolo and E. Blasco, Mol. Syst. Des. Eng., 2023, 8, 323 DOI: 10.1039/D2ME00201A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements