Solvent-triggered shape change in gradient-based 4D printed bilayers: case study on semi-crystalline polymer networks
Lorenzo Bonetti, Aron Cobianchi, Daniele Natali, Stefano Pandini,, Massimo Messori, Maurizio Toselli, Giulia Scalet
TL;DR
This paper introduces a method for 4D printing semi-crystalline polymer bilayers that change shape upon solvent exposure, using gradient crosslinking to induce bending, supported by experimental validation and modeling.
Contribution
It presents a novel approach to 4D printing of solvent-responsive bilayers with gradient crosslinking, combining experimental and theoretical analysis.
Findings
Successful fabrication of solvent-triggered bilayers
Gradient crosslinking induces controlled bending
Experimental results validate the beam model
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.
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