Reversible shape change structures by grayscale pattern 4D printing

Structures and devices with reversible shape change (RSC) are highly desirable in many applications such as mechanical actuators, soft robotics, and artificial muscles. In this paper, we propose to use 3D grayscale printing method to create reversible self-folding structures. The grayscale pattern was used to control the light intensity distribution of a UV projector in a digital light processing 3D printer such that the same photo irradiation time leads to different curing degrees and thus different crosslinking densities at different locations in the polymer during 3D printing. After leaching the uncured oligomers inside the loosely crosslinked network, bending deformation could be induced due to the volume shrinkage. The bending deformation was reversed if the bent structure absorbed acetone and swelled. Using this method, we designed and created RSC structures such as reversible pattern transformation and self-expanding/shrinking structures, auxetic metamaterial, structures mimicking the blossom of a flower. The grayscale 4D printing method provides us a simple and efficient way to create active structures and has great potential in the application of smart structures, composite materials, soft robotics and endovascular stent.

[1]  Jiangtao Wu,et al.  Evolution of material properties during free radical photopolymerization , 2018 .

[2]  Shawn A. Chester,et al.  Micro 3D Printing of a Temperature-Responsive Hydrogel Using Projection Micro-Stereolithography , 2018, Scientific Reports.

[3]  K. Liew,et al.  Pattern transformation of single-material and composite periodic cellular structures , 2017 .

[4]  Conner K. Dunn,et al.  3D printed reversible shape changing soft actuators assisted by liquid crystal elastomers. , 2017, Soft matter.

[5]  Daining Fang,et al.  Desolvation Induced Origami of Photocurable Polymers by Digit Light Processing. , 2017, Macromolecular rapid communications.

[6]  Jun Ni,et al.  A review of 4D printing , 2017 .

[7]  D. Fang,et al.  Origami by frontal photopolymerization , 2017, Science Advances.

[8]  Jizhou Song,et al.  Ultrafast Digital Printing toward 4D Shape Changing Materials , 2017, Advanced materials.

[9]  Xuanhe Zhao,et al.  Hydraulic hydrogel actuators and robots optically and sonically camouflaged in water , 2017, Nature Communications.

[10]  Ali Khademhosseini,et al.  4D bioprinting: the next-generation technology for biofabrication enabled by stimuli-responsive materials , 2016, Biofabrication.

[11]  João T. Cabral,et al.  Frontal Conversion and Uniformity in 3D Printing by Photopolymerisation , 2016, Materials.

[12]  Katia Bertoldi,et al.  Harnessing Buckling to Design Architected Materials that Exhibit Effective Negative Swelling , 2016, Advanced materials.

[13]  Chao Yuan,et al.  3D Printed Reversible Shape Changing Components with Stimuli Responsive Materials , 2016, Scientific Reports.

[14]  Chao Yuan,et al.  Multi-shape active composites by 3D printing of digital shape memory polymers , 2016, Scientific Reports.

[15]  Elisabetta A. Matsumoto,et al.  Biomimetic 4D printing. , 2016, Nature materials.

[16]  Zewen Liu,et al.  Self-folding graphene-polymer bilayers , 2015 .

[17]  D. Nair,et al.  Tailorable and programmable liquid-crystalline elastomers using a two-stage thiol–acrylate reaction , 2015 .

[18]  O. Matar,et al.  Interfacial Profile and Propagation of Frontal Photopolymerization Waves , 2015 .

[19]  Ramesh Raskar,et al.  Active Printed Materials for Complex Self-Evolving Deformations , 2014, Scientific Reports.

[20]  M. Dickey,et al.  In-plane deformation of shape memory polymer sheets programmed using only scissors , 2014 .

[21]  Yanju Liu,et al.  Shape memory polymers and their composites in aerospace applications: a review , 2014 .

[22]  Lenore L. Dai,et al.  Electronically Programmable, Reversible Shape Change in Two‐ and Three‐Dimensional Hydrogel Structures , 2013, Advanced materials.

[23]  Jonathan Reeder,et al.  Three-Dimensional Flexible Electronics Enabled by Shape Memory Polymer Substrates for Responsive Neural Interfaces. , 2012, Macromolecular materials and engineering.

[24]  E. Thomas,et al.  Micro‐/Nanostructured Mechanical Metamaterials , 2012, Advanced materials.

[25]  Pier Luigi Ganga,et al.  Behavior of Shape Memory Epoxy Foams in Microgravity: Experimental Results of STS-134 Mission , 2012 .

[26]  M. Jamal,et al.  Differentially photo-crosslinked polymers enable self-assembling microfluidics. , 2011, Nature communications.

[27]  Qibing Pei,et al.  Highly Flexible Silver Nanowire Electrodes for Shape‐Memory Polymer Light‐Emitting Diodes , 2011, Advanced materials.

[28]  A. Skordos,et al.  Toward a constitutive model for cure-dependent modulus of a high temperature epoxy during the cure , 2010 .

[29]  D. Broer,et al.  Printed artificial cilia from liquid-crystal network actuators modularly driven by light. , 2009, Nature materials.

[30]  Tomoyuki Ishikawa,et al.  Rapid and reversible shape changes of molecular crystals on photoirradiation , 2007, Nature.

[31]  J. Douglas,et al.  Propagating waves of network formation induced by light , 2005 .

[32]  R. Langer,et al.  Biodegradable, Elastic Shape-Memory Polymers for Potential Biomedical Applications , 2002, Science.

[33]  Banahalli R. Ratna,et al.  Carbon coated liquid crystal elastomer film for artificial muscle applications , 2002 .

[34]  V. V. Vasiliev,et al.  Anisogrid lattice structures : survey of development and application , 2001 .

[35]  Patrick T. Mather,et al.  Viscoelastic Properties of an Epoxy Resin during Cure , 2001 .

[36]  Dean Calloway,et al.  Beer-Lambert Law , 1997 .

[37]  D. F. Swinehart,et al.  The Beer-Lambert Law , 1962 .

[38]  Shir Shapira,et al.  4D Printing of Shape Memory-Based Personalized Endoluminal Medical Devices. , 2017, Macromolecular rapid communications.

[39]  A. Lotkov,et al.  Structure and properties of self-expanding intravascular NiTi stents doped with Si ions , 2017 .

[40]  Tuan Ngo,et al.  A Numerical Study of Auxetic Composite Panels under Blast Loadings , 2016 .

[41]  F. Quadrini,et al.  Shape Memory Composites for Self-deployable Structures in Aerospace Applications , 2014 .

[42]  Y. Osada,et al.  A polymer gel with electrically driven motility , 1992, Nature.

[43]  Somnath Ghosh,et al.  Analytical Division Diary , 1981 .