Stimuli-responsive micro/nanoporous hairy skin for adaptive thermal insulation and infrared camouflage

2020 ◽  
Vol 7 (12) ◽  
pp. 3258-3265
Author(s):  
Ayoung Choe ◽  
Jeonghee Yeom ◽  
Yeju Kwon ◽  
Youngoh Lee ◽  
Young-Eun Shin ◽  
...  
Keyword(s):  
Shape Memory ◽  
Thermal Insulation ◽  
Shape Memory Polymer ◽  
Stimuli Responsive ◽  
Hairy Skin ◽  
Infrared Camouflage

A smart hairy skin with hiearchical micro/nanoporous shape memory polymer enables dynamically adaptive thermal insulation.

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 A Mini-Review of Shape-Memory Polymer-Based Materials : Stimuli-responsive shape-memory polymers

2020 ◽  
Vol 64 (4) ◽  
pp. 425-442
Author(s):  
Mathew J. Haskew ◽  
John G. Hardy
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Shape Memory Polymers ◽  
Research Interest ◽  
External Stimulus ◽  
Stimuli Responsive ◽  
Responsive Polymer ◽  
Potential Applications ◽  
Shape Memory Effects ◽  
Stimuli Responsive Polymer

Shape-memory polymers (SMPs) enable the production of stimuli-responsive polymer-based materials with the ability to undergo a large recoverable deformation upon the application of an external stimulus. Academic and industrial research interest in the shape-memory effects (SMEs) of these SMP-based materials is growing for task-specific applications. This mini-review covers interesting aspects of SMP-based materials, their properties, how they may be investigated and highlights examples of the potential applications of these materials.

Different Processing Methods to Obtain Porous Structure in Shape Memory Polymers

2007 ◽  
Vol 539-543 ◽  
pp. 663-668 ◽  
Author(s):  
Silvia Farè ◽  
Luigi de Nardo ◽  
S. De Cicco ◽  
M. Jovenitti ◽  
Maria Cristina Tanzi
Keyword(s):  
Porous Structure ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Shape Memory Polymers ◽  
Porous Structures ◽  
Stimuli Responsive ◽  
Foaming Agents ◽  
Tissue Integration ◽  
Clinical Procedures ◽  
Good Ability

In the last few years, clinical procedures undergone huge modifications. Among them, mini-invasive surgery has modified the clinical practice and the quality of life of patients. Shape Memory Polymers (SMPs), a class of stimuli-responsive materials, can be considered ideal candidates for the design of devices for mini-invasive surgical procedures. Such a device can be inserted in a packed in, temporary shape and later can expand at body temperature. A bone defect could be filled by a SMP porous structure, that improves the tissue integration and healing. In this work, two different processing techniques to obtain porous shape memory polymer scaffolds from Calo MER™ and MM-4520, two SMPs, are presented. Porous structures were obtained by micro-extrusion with different chemical foaming agents or with sodium chloride, or by solvent casting/particulate leaching. The morphology, the thermo-mechanical and the shape recovery properties of the SMP porous samples were investigated. Tridimensional porous structures showed a well interconnected morphology, with a pore size in the range aimed for bone interaction applications. The shape memory properties were not significantly affected by the transformation processes: a good ability of recovering the original shape was verified. Therefore, the porous structures, obtained from these SMP materials, appear adequate for an use as bone filler.

scholarly journals A review of stimuli-responsive shape memory polymer composites

Polymer ◽  
2013 ◽  
Vol 54 (9) ◽  
pp. 2199-2221 ◽  
Author(s):  
Harper Meng ◽  
Guoqiang Li
Keyword(s):  
Shape Memory ◽  
Polymer Composites ◽  
Shape Memory Polymer ◽  
Stimuli Responsive

Electro-thermo-mechanical behavior of carbon nanopaper shape memory polymer composites

2021 ◽  
pp. 1045389X2110188
Author(s):  
Veli Bugra Ozdemir ◽  
Kawai Kwok
Keyword(s):  
Mechanical Behavior ◽  
Shape Memory ◽  
Shape Change ◽  
Shape Memory Polymer ◽  
Axial Loading ◽  
Element Model ◽  
Close Correlation ◽  
Stimuli Responsive ◽  
Shape Memory Composites ◽  
Shape Programming

An electro-active composite based on carbon nanopaper (CNP) shape memory polymer (SMP) composite is proposed for actuating deployment of composite deployable structures. Carbon nanopaper shape memory composites are stimuli-responsive materials that can change between programmed shapes and the original shape by a voltage input. The proposed composite is a sandwich structure where the CNP layer acts as a flexible electrical heater when a voltage difference is applied. The shape change behavior of CNP-SMP composite presents a coupled electrical-thermal-structural problem. This paper presents a combined experimental, numerical, and analytical study of the time-dependent shape programming, stowage, and actuation of the CNP-SMP composite. The governing equations for the multiphysics behavior are derived. Characterization of the electrical and mechanical properties of the materials are carried out and employed in a nonlinear, fully coupled electrical-thermal-structural finite element model. Shape programming, stowage and actuation characteristics of the composite are investigated experimentally under axial loading. An analytical model is derived for the thermo-mechanical behavior of the composite which directly expresses the recovery over time through the creep compliance function. Close correlation is obtained between experimental measurements and numerical simulations. The proposed model can accurately predict the load and shape characteristics throughout programming, stowage, and actuation.

Shape Memory Polymer Porous Structures for Mini-Invasive Surgical Procedures

2006 ◽  
Author(s):  
Luigi de Nardo ◽  
Sabrina De Cicco ◽  
Matteo Jovenitti ◽  
Maria C. Tanzi ◽  
Silvia Fare`
Keyword(s):  
Shape Memory ◽  
Surgical Procedures ◽  
Invasive Surgery ◽  
Materials Science ◽  
Shape Memory Polymer ◽  
Porous Structures ◽  
Stimuli Responsive ◽  
Tissue Integration ◽  
Clinical Procedures ◽  
Good Ability

In the recent past, clinical procedures underwent huge modifications. Among them, mini-invasive surgery has modified the clinical practice and the quality of life of patients. All these evolutions are strictly correlated to the advancement in materials science. Shape Memory Polymers (SMPs), a novel class of stimuli-responsive materials, can be considered ideal candidates for the design of devices for mini-invasive surgery. Such devices can be inserted in a compact temporary shape and subsequently expanded at body temperature: a bone defect, e.g., could be filled by a filler made of SMPs. With the aim of promoting tissue integration and healing, these structures should present a suitable porosity. In this work two different processing techniques to obtain shape memory polymer scaffolds from Calo·MER™, a SMP, are presented. Porous structures were obtained by micro-extrusion, with different chemical expanding agents or by particulate leaching with salt. Morphology, thermo-mechanical and shape recovery properties of the SMP porous samples were investigated. The obtained foams show a well interconnected morphology, with a pore size in the range suitable for bone applications. Shape memory properties were not significantly affected by the transformation processes: a good ability of recovering the original shape was verified. Therefore, foams obtained from these materials could be used to fabricate devices for mini-invasive surgical procedures.

scholarly journals On the behavior of functionally graded shape memory polymer composites under thermal coupling

2021 ◽  
Vol 37 ◽  
pp. 311-317
Author(s):  
Bingfei Liu ◽  
Kai Yin ◽  
Fangfang Zhang ◽  
Rui Zhou
Keyword(s):  
Shape Memory ◽  
Polymer Composites ◽  
Thermal Loading ◽  
Shape Memory Polymer ◽  
Geometric Dimension ◽  
Functionally Graded ◽  
Thermal Coupling ◽  
Stimuli Responsive ◽  
Performance Requirements ◽  
Mechanics Of Composite Materials

Abstract Shape memory polymer composites (SMPC), which are a type of stimuli-responsive material, show better mechanical properties than pure shape memory polymers. However, different engineering applications have different requirements for the fiber content of SMPC. For example, some parts of the structure require more fibers to enhance strength, while other parts require fewer fibers to maintain deformability. In order to solve this problem, a functionally graded shape memory polymer composite (FG-SMPC) is proposed in this work. The contents of the fibers for the FG-SMPC can be changed along the geometric dimension of the material, enabling different performance requirements to be met in different parts of the structure. Based on the constitutive model of the SMP and the mechanics of composite materials, the mechanical behaviors of the FG-SMPC under thermal loading are discussed. The results show that such materials exhibit gradient behaviors for both the intensity and shape memory effect with different gradient distributions.

Towards a Design Framework for Multifunctional Shape Memory Polymer Based Product in the Era of 4D Printing

2018 ◽  
Author(s):  
Bingcong Jian ◽  
Fédéric Demoly ◽  
Yicha Zhang ◽  
Samuel Gomes
Keyword(s):  
Additive Manufacturing ◽  
Shape Memory ◽  
Smart Materials ◽  
Ad Hoc ◽  
Shape Memory Polymer ◽  
Functional Materials ◽  
Product Development Process ◽  
Stimuli Responsive ◽  
4D Printing ◽  
Complex Stimuli

Shape-memory polymers (SMPs) as stimuli-responsive shape-changing materials gained significant interest in recent years. Their developments have challenged the conventional understanding of the polymer effect and have further enhanced and broadened the applications of the smart materials. Nowadays, 4D printing is seen as an emerging technology that combines smart materials and additive manufacturing, which can be used to design active mechanical structures. It provides tremendous potential for engineering applications which is capable of producing complex, stimuli-responsive 3D structures. While many “ad hoc” designs of 4D printed solutions have been progressively developed for a specific process, the general approach of additive manufacturing that integrates smart materials in real time across an entire product development process is not pervasive in the industry. To solve this issue, the authors propose a general 4D printing oriented framework for the design of multi-functional SMPs architectures. This framework is not intended to be an exhaustive and specific instruction but is instead a means to motivate these designers to seek the process of applying these unique functional materials to their own designs and applications. It will be useful and give more insight into the design process of the SMP device.

scholarly journals 4D Printing and Characterization of Shape Memory Polymer (SMP) Based Smart Gripper

2020 ◽  
Vol 5 (10) ◽  
pp. 1204-1211
Author(s):  
Francis Irungu Maina ◽  
Nahashon Osinde ◽  
Japheth Ka’pesha Odira ◽  
Patrick Kariuki Wanjiru ◽  
Margaret Wanjiku Mwangi
Keyword(s):  
Shape Memory ◽  
Recovery Rate ◽  
Shape Recovery ◽  
Shape Memory Polymer ◽  
Print Quality ◽  
Stimuli Responsive ◽  
4D Printing ◽  
Printing Parameters ◽  
Made In

Shape Memory Polymer (SMP) is stimuli-responsive material with the ability to recover the original shape from a deformation upon triggering by an appropriate stimulus like heat, light, and electricity. The shape recovery properties can be harnessed through 4D printing of self-recoverable functional structures and made usable in fields like medicine and robotics. To investigate the recovery properties, best printing parameters and optimal sizes, 4D reconfigurable gripper designed in CAD was printed in Ultimaker 2 Printer. Different stencils were made in varying printing parameters of temperature, infill, speed and time. Analysis for the stencils proved best print quality at a temperature of 195 °C and nozzle retract speed of 40mm/s. Shape recovery characterization was done on MATLAB. A printing temperature of 203 °C, infill density of 38% and printing speed of 40 mm/s gave the gripper with the best print quality. Characterization of the varying performances of the four grippers was attributed to the different infill percentages. The lower the infill, the higher the recovery rate due to the low stiffness of the gripper. The best recovery rate of 96.93% was associated with an optimal printing temperature of 203 °C.

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