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Title: Shape-morphing composites with designed micro-architectures

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep27933· OSTI ID:1357360

Shape memory polymers (SMPs) are attractive materials due to their unique mechanical properties, including high deformation capacity and shape recovery. SMPs are easier to process, lightweight, and inexpensive compared to their metallic counterparts, shape memory alloys. However, SMPs are limited to relatively small form factors due to their low recovery stresses. Lightweight, micro-architected composite SMPs may overcome these size limitations and offer the ability to combine functional properties (e.g., electrical conductivity) with shape memory behavior. Fabrication of 3D SMP thermoset structures via traditional manufacturing methods is challenging, especially for designs that are composed of multiple materials within porous microarchitectures designed for specific shape change strategies, e.g. sequential shape recovery. We report thermoset SMP composite inks containing some materials from renewable resources that can be 3D printed into complex, multi-material architectures that exhibit programmable shape changes with temperature and time. Through addition of fiber-based fillers, we demonstrate printing of electrically conductive SMPs where multiple shape states may induce functional changes in a device and that shape changes can be actuated via heating of printed composites. As a result, the ability of SMPs to recover their original shapes will be advantageous for a broad range of applications, including medical, aerospace, and robotic devices.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1357360
Report Number(s):
LLNL-JRNL-680227
Journal Information:
Scientific Reports, Vol. 6, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 62 works
Citation information provided by
Web of Science

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Cited By (17)

Field responsive mechanical metamaterials journal December 2018
The research status and challenges of shape memory polymer-based flexible electronics journal January 2019
Remotely and Sequentially Controlled Actuation of Electroactivated Carbon Nanotube/Shape Memory Polymer Composites journal November 2019
An Overview of Novel Actuators for Soft Robotics journal August 2018
Active Mixing of Disparate Inks for Multimaterial 3D Printing journal April 2019
Nanostructured resorcinol-formaldehyde ink for 3D direct writing journal May 2018
Three-dimensionally printed designable joint for carbon fibre reinforced plastics journal May 2018
A 3D Printable Thermal Energy Storage Crystalline Gel Using Mask-Projection Stereolithography journal October 2018
3D-Printed, Superelastic Polypyrrole-Graphene Electrodes with Ultrahigh Areal Capacitance for Electrochemical Energy Storage journal June 2018
Multi-stage responsive 4D printed smart structure through varying geometric thickness of shape memory polymer journal October 2017
3D Printing of Compositional Gradients Using the Microfluidic Circuit Analogy journal November 2019
Recent Advances in 4D Bioprinting journal September 2019
Review of Progress in Shape Memory Epoxies and Their Composites journal December 2017
Shape-changing polymers for biomedical applications journal January 2019
Enhanced multimaterial 4D printing with active hinges journal May 2018
Direct Laser Writing of Low-Density Interdigitated Foams for Plasma Drive Shaping journal September 2017
An overview of novel actuators for soft robotics other January 2018

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