Cited by 524Advanced Materials and MechanicsLaser and Thermal Forming TechniquesPolymer composites and self-healing

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Self-folding of polymer sheets using local light absorption

Liu, Ying, Boyles, Julie K., Genzer, Jan, Dickey, Michael D.·2012·Soft Matter

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Abstract

This paper demonstrates experimentally and models computationally a novel and simple approach for self-folding of thin sheets of polymer using unfocused light. The sheets are made of optically transparent, pre-strained polystyrene (also known as Shrinky-Dinks) that shrink in-plane if heated uniformly. Black ink patterned on either side of the polymer sheet provides localized absorption of light, which heats the underlying polymer to temperatures above its glass transition. At these temperatures, the predefined inked regions (i.e., hinges) relax and shrink, and thereby cause the planar sheet to fold into a three-dimensional object. Self-folding is therefore achieved in a simple manner without the use of multiple fabrication steps and converts a uniform external stimulus (i.e., unfocused light) on an otherwise compositionally homogenous substrate into a hinging response. Modeling captures effectively the experimental folding trends as a function of the hinge width and support temperature and suggests that the hinged region must exceed the glass transition temperature of the sheet for folding to occur.

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Authors: Liu, Y., Boyles, J. K., Genzer, J., & Dickey, M. D.
Affiliations: North Carolina State University (US)
Corresponding author: Dickey, Michael D.
ORCID: Liu, Ying
Genzer, Jan
Dickey, Michael D.
Venue: Soft Matter
Publisher: Royal Society of Chemistry (RSC)
Published: 2012
Volume: 8
Issue: 6
Pages: 1764-1769
ISSN: 1744-683X (ISSN-L)
1744-6848
DOI: 10.1039/c1sm06564e
OpenAlex: W2123741193
Cited by: 523
References: 42
Citations by year: 2026: 16 · 2025: 15 · 2024: 20 · 2023: 21 · 2022: 39 · 2021: 38 · 2020: 53 · 2019: 30 · 2018: 60 · 2017: 59 · 2016: 45 · 2015: 38 · 2014: 45 · 2013: 33 · 2012: 10
FWCI: 49.89
Type: journal article
Language: en
Open access: closed
Locations: Soft Matter (publishedVersion)
Funders: U.S. Department of Energy
Royal Society
Royal Society of Chemistry
Topics: Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
Physical Sciences › Engineering › Computational Mechanics › Laser and Thermal Forming Techniques
Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
Keywords: self-folding, polymer sheets, polystyrene, light-induced heating, hinge, glass transition temperature, thermal contraction

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Self-folding of polymer sheets using local light absorption

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