Solvent-triggered shape change in gradient-based 4D printed bilayers: case study on semi-crystalline polymer networks.

Bonetti, Lorenzo; Cobianchi, Aron; Natali, Daniele; Pandini, Stefano; Messori, Massimo; Toselli, Maurizio; Scalet, Giulia · Soft Matter · 2024

basic_science · Level V

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Abstract

We propose an approach to 4D print solvent-triggered, gradient-based bilayers made of semi-crystalline crosslinked polymer networks. Out-of-plane bending is obtained after immersion in the solvent, exploiting the different swelling degrees of the layers resulting from crosslinking gradients. Lastly, a beam model of the shape transformation is applied and experimentally validated.