Mr. Greg McCallum Profile

Greg McCallum

at Auburn Univ

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Proceedings Article | 18 April 2023 Presentation

Self-folding of liquid crystal elastomer composite films (Conference Presentation)

Greg McCallum, Yi-Hung Lin, Bryan Beckingham, Russell Mailen

Proceedings Volume PC12484, PC1248407 (2023) https://doi.org/10.1117/12.2658534

KEYWORDS: Liquid crystals, Composites, Photopolymerization, Thin films, Temperature metrology, Robotics, Optical alignment, Multifunctional materials, Crystals, Actuators

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In this work, we seek to fabricate self-folding liquid crystal elastomer (LCE) composite films. Liquid crystal elastomers (LCEs) are a class of smart, multifunctional materials that can be imparted with enhanced, anisotropic mechanical properties through the alignment of crystalline domains. Crystalline order decreases with increasing temperature, and long-range order is lost above the nematic to isotropic transition temperature, TNI. This enables programmable, reversible actuation in response to temperature changes. The envisioned composite films comprise domains of active, monodomain LCEs to drive reversible self-folding, which are adhered to passive, thin films that serve as a framework to guide the self-folding response. LCEs will be synthesized using a two-stage thiol-acrylate Michael addition and photopolymerization (TAMAP) reaction. The first-stage consists of a room temperature cure to form polydomain films, and a second-stage photopolymerization of the mechanically deformed LCE film forms aligned liquid crystal monodomains. Composite films will be molded to a folded state prior to the second stage cure such that heating above TNI produces a reversible unfolding response. We characterize the self-folding behavior of these materials using a series of single-fold and multiple, intersecting fold geometries. We envision application of these composite films as actuators in soft robotics and morphing surfaces.

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