Thermoreversibly Crosslinked Poly(ε-caprolactone) as Recyclable Shape-Memory Polymer Network

2011 ◽  
Vol 32 (16) ◽  
pp. 1264-1269 ◽  
Author(s):  
Thomas Defize ◽  
Raphaël Riva ◽  
Jean-Marie Raquez ◽  
Philippe Dubois ◽  
Christine Jérôme ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Network

scholarly journals Shape memory polymer network with thermally distinct elasticity and plasticity

2016 ◽  
Vol 2 (1) ◽  
pp. e1501297 ◽  
Author(s):  
Qian Zhao ◽  
Weike Zou ◽  
Yingwu Luo ◽  
Tao Xie
Keyword(s):  
Shape Memory ◽  
Molecular Design ◽  
Shape Change ◽  
Shape Memory Polymer ◽  
Polymer Network ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Device Applications ◽  
Temperature Ranges ◽  
Rational Molecular Design

Stimuli-responsive materials with sophisticated yet controllable shape-changing behaviors are highly desirable for real-world device applications. Among various shape-changing materials, the elastic nature of shape memory polymers allows fixation of temporary shapes that can recover on demand, whereas polymers with exchangeable bonds can undergo permanent shape change via plasticity. We integrate the elasticity and plasticity into a single polymer network. Rational molecular design allows these two opposite behaviors to be realized at different temperature ranges without any overlap. By exploring the cumulative nature of the plasticity, we demonstrate easy manipulation of highly complex shapes that is otherwise extremely challenging. The dynamic shape-changing behavior paves a new way for fabricating geometrically complex multifunctional devices.

scholarly journals Programming a crystalline shape memory polymer network with thermo- and photo-reversible bonds toward a single-component soft robot

2018 ◽  
Vol 4 (1) ◽  
pp. eaao3865 ◽  
Author(s):  
Binjie Jin ◽  
Huijie Song ◽  
Ruiqi Jiang ◽  
Jizhou Song ◽  
Qian Zhao ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Network ◽  
Single Component ◽  
Soft Robot

An annulus fibrosus closure device based on a biodegradable shape-memory polymer network

Biomaterials ◽  
2013 ◽  
Vol 34 (33) ◽  
pp. 8105-8113 ◽  
Author(s):  
Shahriar Sharifi ◽  
Theo G. van Kooten ◽  
Hendrik-Jan C. Kranenburg ◽  
Björn P. Meij ◽  
Marc Behl ◽  
...  
Keyword(s):  
Shape Memory ◽  
Annulus Fibrosus ◽  
Shape Memory Polymer ◽  
Polymer Network ◽  
Closure Device

Thermo-mechanical Behavior of (Meth)Acrylate Shape-Memory Polymer Networks

2011 ◽  
Vol 1312 ◽  
Author(s):  
Carl P. Frick ◽  
Nishant Lakhera ◽  
Christopher M. Yakacki
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Network ◽  
Polymer Networks ◽  
Weight Fraction ◽  
Crosslinking Density ◽  
Mechanical Stiffness ◽  
Actuation Force ◽  
Order Of Magnitude ◽  
Cross Linker

ABSTRACTOur overall approach is based on developing a photocrosslinkable polymer network with a favorable shape-memory response, using polymer chemistry and crosslinking density to control thermo-mechanical properties. Three polymer networks were created and thermo-mechanically tested, each from tert-Butyl acrylate linear builder co-polymerized with a poly(ethylene glycol) dimethacrylate cross-linker. By systematically altering the molecular weight and the weight fraction of the cross-linker, it was possible to create three polymers that exhibited the same glass transition temperature, but varied by almost an order of magnitude in rubbery modulus. Therefore, the mechanical stiffness could be tailored to suit a given application. Recovery behavior of the polymers was characterized over a range of deformation temperatures. It has been implicitly assumed a linear relationship between Free-Strain (i.e. no actuation force) and Fixed-Stress (i.e. maximum actuation force), however, this has never been confirmed experimentally. The energy per unit volume performed by the shape-memory polymer was quantified, and observed to be a function of strain recovered. The maximum recoverable work was shown to increase with cross-linking density, although the overall efficiency is similar for all materials tested.

A remote-activated shape memory polymer network employing vinyl-capped Fe3O4nanoparticles as netpoints for durable performance

2014 ◽  
Vol 23 (8) ◽  
pp. 085005 ◽  
Author(s):  
Shuang Xia ◽  
Xingjian Li ◽  
Yaru Wang ◽  
Yi Pan ◽  
Zhaohui Zheng ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Network

scholarly journals A Self-Healing and Shape Memory Polymer that Functions at Body Temperature

Molecules ◽  
2019 ◽  
Vol 24 (18) ◽  
pp. 3224 ◽  
Author(s):  
Hui-Ying Lai ◽  
Hong-Qin Wang ◽  
Jian-Cheng Lai ◽  
Cheng-Hui Li
Keyword(s):  
Body Temperature ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Network ◽  
Self Healing ◽  
Wearable Electronics ◽  
Dual Functional ◽  
Wide Range ◽  
Human Body Temperature ◽  
Shape Memory Effects

Dual-functional polymeric system combining shape memory with self-healing properties has attracted increasingly interests of researchers, as both of these properties are intelligent and promising characteristics. Moreover, shape memory polymer that functions at human body temperature (37 °C) are desirable because of their potential applications in biomedical field. Herein, we designed a polymer network with a permanent covalent crosslinking and abundant weak hydrogen bonds. The former introduces elasticity responsible and maintain the permanent shape, and the latter contributes to the temporary shape via network rearrangement. The obtained PDMS-COO-E polymer films exhibit excellent mechanical properties and the capability to efficiently self-heal for 6 h at room temperature. Furthermore, the samples turn from a viscous state into an elastic state at 37 °C. Therefore, this polymer has shape memory effects triggered by body temperature. This unique material will have a wide range of applications in many fields, containing wearable electronics, biomedical devices, and 4D printing.

scholarly journals Digital coding of mechanical stress in a dynamic covalent shape memory polymer network

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Guogao Zhang ◽  
Wenjun Peng ◽  
Jingjun Wu ◽  
Qian Zhao ◽  
Tao Xie
Keyword(s):  
Shape Memory ◽  
Mechanical Stress ◽  
Shape Memory Polymer ◽  
Polymer Network

Exploring Dynamic Equilibrium of Diels–Alder Reaction for Solid State Plasticity in Remoldable Shape Memory Polymer Network

2016 ◽  
Vol 5 (7) ◽  
pp. 805-808 ◽  
Author(s):  
Guogao Zhang ◽  
Qian Zhao ◽  
Lipeng Yang ◽  
Weike Zou ◽  
Xiangyi Xi ◽  
...  
Keyword(s):  
Solid State ◽  
Shape Memory ◽  
Dynamic Equilibrium ◽  
Shape Memory Polymer ◽  
Polymer Network ◽  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction
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