Design and Characterization of a Resistively Heated Shape Memory Polymer Micro-Release Device1

2014 ◽  
Vol 8 (2) ◽  
Author(s):  
Landon D. Nash ◽  
Mark A. Wierzbicki ◽  
Duncan J. Maitland
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Resistively Heated

Synthesis and characterization of a novel biodegradable thermoplastic shape memory polymer

2009 ◽  
Vol 63 (3-4) ◽  
pp. 347-349 ◽  
Author(s):  
Yuanliang Wang ◽  
Yonggang Li ◽  
Yanfeng Luo ◽  
Meina Huang ◽  
Zhiqing Liang
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Synthesis And Characterization

scholarly journals Preparation and characterization of shape memory polymer scaffolds via solvent casting/particulate leaching

2012 ◽  
Vol 2 (10) ◽  
pp. 119-126 ◽  
Author(s):  
Luigi De Nardo ◽  
Serena Bertoldi ◽  
Alberto Cigada ◽  
Maria Cristina Tanzi ◽  
Håvard Jostein Haugen ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Solvent Casting ◽  
Polymer Scaffolds ◽  
Particulate Leaching

Synthesis and Characterization of Radiopaque Shape Memory Polymers

2017 ◽  
Author(s):  
Kendal Ezell ◽  
Landon Nash ◽  
Sonya Gordon ◽  
Duncan Maitland
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
The United States ◽  
Endovascular Embolization ◽  
Polymer Foam ◽  
X Ray ◽  
Unruptured Cerebral Aneurysm ◽  
Composite Foams ◽  
Function Impairment

An estimated 6 million people in the United States have an unruptured cerebral aneurysm [1]. If left untreated, these aneurysms can rupture and to lead to severe brain function impairment or even death. Shape memory polymer (SMP) foams have been proposed for use to optimize endovascular embolization in place of current embolization devices [2,3]. SMPs are capable of actuating from a programmed secondary geometry to their expanded primary geometry in response to a stimulus, such as body temperature [4]. The expanded foam geometry provides an interface for embolization of the aneurysm to occur, however, treatment with these devices has limited visibility under fluoroscopy. Previous work by Hasan et al. increased radiopacity through the incorporation of tungsten (W) nanoparticles. These composite foams showed successful x-ray visibility, but aggregate disruption of the SMP matrix led to decreased mechanical properties [5]. This work addresses limitations of composite SMP foams, namely toughness, by chemically incorporating x-ray visible monomers, such as the triodobenzene containing monomer, 5-Amino-2,4,6-triiodoisophthalic acid (AT), into the material composition. These materials enable contrast agent loading without disrupting the polymer matrix. This polymer foam system was characterized to determine the clinical relevance of the improved radiopaque SMP foam for occlusion devices.

Shape-Memory Actuation of Individual Micro-/Nanofibers

MRS Advances ◽  
2020 ◽  
Vol 5 (46-47) ◽  
pp. 2391-2399
Author(s):  
Yue Liu ◽  
Oliver E. C. Gould ◽  
Karl Kratz ◽  
Andreas Lendlein
Keyword(s):  
Shape Memory ◽  
Shape Change ◽  
Shape Memory Polymer ◽  
Fiber Contact ◽  
Physical Functions ◽  
Robotic Devices ◽  
The Stability ◽  
Soft Actuators ◽  
Working Distance

AbstractAdvances in the fabrication and characterization of polymeric nanomaterials has greatly advanced the miniaturization of soft actuators, creating materials capable of replicating the functional physical behavior previously limited to the macroscale. Here, we demonstrate how a reversible shape-memory polymer actuation can be generated in a single micro/nano object, where the shape change during actuation of an individual fiber can be dictated by programming using an AFM-based method. Electrospinning was used to prepare poly(ε-caprolactone) micro-/nanofibers, which were fixed and crosslinked on a structured silicon wafer. The programming as well as the observation of recovery and reversible displacement of the fiber were performed by vertical three point bending, using an AFM testing platform introduced here. A plateau tip was utilized to improve the stability of the fiber contact and working distance, enabling larger deformations and greater rbSMPA performance. Values for the reversible elongation of εrev = 3.4 ± 0.1% and 10.5 ± 0.1% were obtained for a single micro (d = 1.0 ± 0.2 μm) and nanofiber (d = 300 ± 100 nm) in cyclic testing between the temperatures 10 and 60 °C. The reversible actuation of the nanofiber was successfully characterized for 10 cycles. The demonstration and characterization of individual shape-memory nano and microfiber actuators represents an important step in the creation of miniaturized robotic devices capable of performing complex physical functions at the length scale of cells and structural component of the extracellular matrix.

Characterization of polymeric shape memory materials

2017 ◽  
Vol 37 (1) ◽  
pp. 1-20 ◽  
Author(s):  
Xue Lian Wu ◽  
Wei Min Huang ◽  
Hai Bao Lu ◽  
Chang Chun Wang ◽  
Hai Po Cui
Keyword(s):  
Shape Memory ◽  
Memory Effect ◽  
Memory Performance ◽  
Shape Memory Polymer ◽  
Testing Methods ◽  
Temperature Memory Effect ◽  
Shape Memory Materials ◽  
Standard Techniques ◽  
Selection Of

Abstract After a short discussion of various shape memory related phenomena and the basic working mechanisms behind the shape memory effect (SME) in polymeric shape memory materials (SMMs), standard techniques and procedures to characterize these types of materials are reviewed in details (including the concerns in the selection of testing methods and parameters). Although the focus of this paper is on the heating-responsive SME, important issues in the chemo-responsive SME are addressed. Furthermore, some other shape memory related phenomena, such as various kinds of temperature memory effect (TME), and multiple-SME etc., and optimization of the shape memory performance of a shape memory polymer (SMP) via tailoring the programming parameters are included.

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