Controlled
3D Shape Transformation
Activated by Room Temperature Stretching and Release of a Flat Polymer
Sheet
Posted on 2019-08-05 - 22:29
Shape
transformation
of polymeric materials, including hydrogels, liquid crystalline, and
semicrystalline polymers, can be realized by exposing the shape-changing
materials to the effect of a variety of stimuli such as temperature,
light, pH, and magnetic and electric fields. Herein, we demonstrate
a novel and different approach that allows a flat sheet or strip of
a polymer to transform into a predesigned 3D shape or structure by
simply stretching the polymer at room temperature and then releasing
it from the external stress, that is, a 2D-to-3D shape change is activated
by mechanical deformation under ambient conditions. This particular
type of stimuli-controlled shape-changing polymers is based on suppressing
plastic deformation in selected regions of the flat polymer sheet
prior to stretching and release. We validated the design principle
by using a polymer blend composed of poly(ethylene oxide) (PEO), poly(acrylic
acid) (PAA), and tannic acid (TA) whose plastic deformation can be
locally inhibited by surface treatment using an aqueous solution of
copper sulfate pentahydrate (Cu2+ ink) that cross-links
PAA chains through a Cu2+–carboxylate coordination
and, consequently, increases the material’s Young’s
modulus and yield strength. After room temperature stretching and
release, elastic deformation in the Cu2+ ink-treated regions
leads to 3D shape transformation that is controlled by the patterned
surface treatment. This facile and effective “stretch-and-release”
approach widens the scope of preparation and application for shape-changing
polymers.
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Wang, Shuwei; Li, Guo; Liu, Zhaotie; Liu, Zhongwen; Jiang, Jinqiang; Zhao, Yue (2019). Controlled
3D Shape Transformation
Activated by Room Temperature Stretching and Release of a Flat Polymer
Sheet. ACS Publications. Collection. https://doi.org/10.1021/acsami.9b10071