scholarly journals Surface Structures, Particles, and Fibers of Shape-Memory Polymers at Micro-/Nanoscale

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Liangliang Cao ◽  
Liwei Wang ◽  
Cihui Zhou ◽  
Xin Hu ◽  
Liang Fang ◽  
...  
Keyword(s):  
Shape Memory ◽  
Preparation Method ◽  
Shape Memory Polymers ◽  
Polymeric Materials ◽  
Surface Structures ◽  
Smart Polymers ◽  
Molecular Architecture ◽  
Free Standing ◽  
Nanoscale Structures

Shape-memory polymers (SMPs) are one kind of smart polymers and can change their shapes in a predefined manner under stimuli. Shape-memory effect (SME) is not a unique ability for specific polymeric materials but results from the combination of a tailored shape-memory creation procedure (SMCP) and suitable molecular architecture that consists of netpoints and switching domains. In the last decade, the trend toward the exploration of SMPs to recover structures at micro-/nanoscale occurs with the development of SMPs. Here, the progress of the exploration in micro-/nanoscale structures, particles, and fibers of SMPs is reviewed. The preparation method, SMCP, characterization of SME, and applications of surface structures, free-standing particles, and fibers of SMPs at micro-/nanoscale are summarized.

Dual crosslinked metallopolymers using orthogonal metal complexes as rewritable shape-memory polymers

2021 ◽  
Author(s):  
Ulrich Sigmar Schubert ◽  
Josefine Meurer ◽  
Thomas Baetz ◽  
Julian Hniopek ◽  
Stefan Zechel ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Shape Memory ◽  
Structural Design ◽  
Shape Memory Polymers ◽  
Synthesis And Characterization

This work presents the synthesis and characterization of easily tuneable shape-memory metallopolymers. Furthermore, the structural design enables excellent rewriting properties. For this purpose, two different polymers were synthesized using either...

Novel Behavior in Smart Polymeric Materials: Stress Memory and its Potential Applications

2016 ◽  
Vol 97 ◽  
pp. 93-99
Author(s):  
Jin Lian Hu ◽  
Harishkumar Narayana
Keyword(s):  
Magnetic Field ◽  
Shape Memory ◽  
Smart Materials ◽  
Shape Memory Polymers ◽  
Polymeric Materials ◽  
External Stimulus ◽  
Artificial Muscles ◽  
Recovery Stress ◽  
Stress Memory ◽  
Potential Applications

Materials, structures and systems, responsive to an external stimulus are smart and adaptive to our human demands. Among smart materials, polymers with shape memory effect are at the forefront of research leading to comprehensive publications and wide applications. In this paper, we extend the concept of shape memory polymers to stress memory ones, which have been discovered recently. Like shape memory, stress memory represents a phenomenon where the stress in a polymer can be programmed, stored and retrieved reversibly with an external stimulus such as temperature and magnetic field. Stress memory may be mistaken as the recovery stress which was studied quite broadly. Our further investigation also reveals that stress memory is quite different from recovery stress containing multi-components including elastic and viscoelastic forces in addition to possible memory stress. Stress memory could be used into applications such as sensors, pressure garments, massage devices, electronic skins and artificial muscles. The current revelation of stress memory potentials is emanated from an authentic application of memory fibres, films, and foams in the smart compression devices for the management of chronic and therapeutic disorders.

Additive manufacturing of shape memory polymers: effects of print orientation and infill percentage on shape memory recovery properties

2020 ◽  
Vol 26 (9) ◽  
pp. 1593-1602
Author(s):  
Jorge Villacres ◽  
David Nobes ◽  
Cagri Ayranci
Keyword(s):  
Additive Manufacturing ◽  
Shape Memory ◽  
Shape Recovery ◽  
Fused Deposition Modeling ◽  
Large Strain ◽  
Shape Memory Polymers ◽  
Polymeric Materials ◽  
Content Type ◽  
Fused Deposition ◽  
Memory Recovery

Purpose The purpose of this paper is to study the shape memory properties of SMP samples produced through a MEAM process. Fused deposition modeling or, as it will be referred to in this paper, material extrusion additive manufacturing (MEAM) is a technique in which polymeric materials are extruded though a nozzle creating parts via accumulation and joining of different layers. These layers are fused together to build three-dimensional objects. Shape memory polymers (SMP) are stimulus responsive materials, which have the ability to recover their pre-programmed form after being exposed to a large strain. To induce its shape memory recovery movement, an external stimulus such as heat needs to be applied. Design/methodology/approach This project investigates and characterizes the influence of print orientation and infill percentage on shape recovery properties. The analyzed shape recovery properties are shape recovery force, shape recovery speed and time elapsed before activation. To determine whether the analyzed factors produce a significant variation on shape recovery properties, t-tests were performed with a 95% confidence factor between each analyzed level. Findings Results proved that print angle and infill percentage do have a significant impact on recovery properties of the manufactured specimens. Originality/value The manufacturing of SMP objects through a MEAM process has a vast potential for different applications; however, the shape recovery properties of these objects need to be analyzed before any practical use can be developed. These have not been studied as a function of print parameters, which is the focus of this study.

Characterization of shear deformation and strain recovery behavior in shape memory polymers

2008 ◽  
Vol 27 (4) ◽  
pp. 498-503 ◽  
Author(s):  
Fazeel Khan ◽  
Jeong-Hoi Koo ◽  
David Monk ◽  
Eric Eisbrenner
Keyword(s):  
Shape Memory ◽  
Shear Deformation ◽  
Shape Memory Polymers ◽  
Strain Recovery ◽  
Recovery Behavior

scholarly journals Fabrication and characterization of shape memory polymers based bioabsorbable biomedical drug eluting stent

2017 ◽  
Vol 45 (8) ◽  
pp. 1740-1750 ◽  
Author(s):  
Vratika C. Sonawane ◽  
Mahesh P. More ◽  
Abhijeet P. Pandey ◽  
Pravin O. Patil ◽  
Prashant K. Deshmukh
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymers ◽  
Drug Eluting Stent ◽  
Drug Eluting ◽  
Fabrication And Characterization
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