High-strain slide-ring shape-memory polycaprolactone-based polyurethane

Soft Matter ◽  
2018 ◽  
Vol 14 (22) ◽  
pp. 4558-4568 ◽  
Author(s):  
Ruiqing Wu ◽  
Jingjuan Lai ◽  
Yi Pan ◽  
Zhaohui Zheng ◽  
Xiaobin Ding
Keyword(s):  
Shape Memory ◽  
Shape Recovery ◽  
High Strain ◽  
Shape Memory Polymer ◽  
Polymer Networks ◽  
Ring Structure ◽  
Recovery Ratio ◽  
Ring Shape ◽  
High Deformability ◽  
Shape Fixity

To enable shape-memory polymer networks to achieve recoverable high deformability with a simultaneous high shape-fixity ratio and shape-recovery ratio, novel semi-crystalline slide-ring shape-memory polycaprolactone-based polyurethane (SR-SMPCLU) with movable net-points constructed by a topologically interlocked slide-ring structure was designed and fabricated.

Characristics of Shape Memory Composites Combined with Shape Memory Alloy and Shape Memory Polymer

2013 ◽  
Vol 705 ◽  
pp. 169-172
Author(s):  
Xue Feng ◽  
Li Min Zhao ◽  
Xu Jun Mi
Keyword(s):  
Shape Memory ◽  
Room Temperature ◽  
Shape Recovery ◽  
Volume Fraction ◽  
Shape Memory Polymer ◽  
Young Modulus ◽  
Thermomechanical Properties ◽  
The Matrix ◽  
Shape Memory Composites ◽  
Shape Fixity

In order to develop high functionality of shape memory materials, the shape memory composites combined with TiNi wire and shape memory epoxy were prepared, and the mechanical and thermomechanical properties were studied. The results showed the addition of TiNi wire increased the Young modulus and breaking strength both at room temperature and at elevated temperature. The composites maintained the rates of shape fixity and shape recovery close to 100%. The maximum recovery stress increased with increasing TiNi wire volume fraction, and obtained almost 3 times of the matrix by adding 1vol% TiNi wire.

scholarly journals Determination of Shape Fixity and Shape Recovery Rate of Carbon Nanotube-filled Shape Memory Polymer Nanocomposites

2012 ◽  
Vol 41 ◽  
pp. 1641-1646 ◽  
Author(s):  
Shahrul Azam Abdullah ◽  
Aidah Jumahat ◽  
Nik Rosli Abdullah ◽  
Lars Frormann
Keyword(s):  
Carbon Nanotube ◽  
Shape Memory ◽  
Polymer Nanocomposites ◽  
Recovery Rate ◽  
Shape Recovery ◽  
Shape Memory Polymer ◽  
Shape Fixity

108 Shape Fixity, Shape Recovery and Secondary Shape Forming of Polyurethane-Shape Memory Polymer

2006 ◽  
Vol 2006.14 (0) ◽  
pp. 27-28
Author(s):  
Hisaaki TOBUSHI ◽  
Syunichi HAYASHI ◽  
Yoshihiro EJIRI ◽  
Toshimi SAKURAGI
Keyword(s):  
Shape Memory ◽  
Shape Recovery ◽  
Shape Memory Polymer ◽  
Shape Fixity

scholarly journals The Influence of Water and Solvent Uptake on Functional Properties of Shape-Memory Polymers

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Ehsan Ghobadi ◽  
Axel Marquardt ◽  
Elias Mahmoudinezhad Zirdehi ◽  
Klaus Neuking ◽  
Fathollah Varnik ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Recovery ◽  
Shape Memory Polymers ◽  
Holding Time ◽  
Fickian Diffusion ◽  
Recovery Ratio ◽  
Solvent Uptake ◽  
Time Shape ◽  
Influence Of Water ◽  
Shape Fixity

In this contribution, diffusion of water, acetone, and ethanol into a polymer matrix has been studied experimentally and numerically by finite element approaches. Moreover, the present study reports an assessment of different thermomechanical conditions of the shape-memory (SM) performance, for example, stress- or strain-holding times in stress- or strain-controlled thermomechanical cycles and the effect of maximum strain. According to the results presented here, the uptake of acetone in Estane is much higher than ethanol and follows classical Fickian diffusion. Further, a series of thermomechanical measurements conducted on dry and physically (hydrolytically) aged polyether urethanes revealed that incorporation of water seems to have an appreciable impact on the shape recovery ratios which can be attributed to the additional physical crosslinks. However, no obvious difference in shape fixation of dry and physically (hydrolytically) aged samples could be recognized. Furthermore, by decreasing the strain-holding time, shape recovery improves significantly. Moreover, the shape fixity is found to be independent of holding time. The shape recovery ratio decreased dramatically with an increase in the stress-holding time.

High-Strain Shape-Memory Properties of Poly(Carbonate-Urea-Urethane)s Based on Aliphatic Oligocarbonates and L-Lysine Diisocyanate

MRS Advances ◽  
2017 ◽  
Vol 2 (47) ◽  
pp. 2529-2536
Author(s):  
Magdalena Mazurek-Budzyńska ◽  
Muhammad Y. Razzaq ◽  
Gabriel Rokicki ◽  
Marc Behl ◽  
Andreas Lendlein
Keyword(s):  
Shape Memory ◽  
Medical Devices ◽  
Shape Recovery ◽  
High Strain ◽  
Shape Memory Polymers ◽  
Interesting Candidate ◽  
Degradable Biomaterials ◽  
Precursor Route ◽  
Shape Fixity ◽  
Poly Carbonate

ABSTRACTThe simultaneous capability of high-strain deformation and high shape recovery ratio constitutes a great challenge in design of the shape-memory polymers. Here we report on poly(carbonate-urea-urethane)s (PCUUs) synthesized by a precursor route, based on oligo(alkylene carbonate) diols, L-lysine diisocyanate (LDI), and water vapor. When programed with a strain of εprog = 800%, the PCUU networks exhibited a one-way shape-memory effect (1W-SME) with excellent shape fixity (> 97%) and shape recovery (> 99%) ratios. The switching temperatures (Tsw) varied between 50 and 56 °C and correlated to the melting transitions of the switching domains. The obtained PCUUs capable of high-strain are interesting candidate materials for degradable biomaterials as required in smart medical devices.

An experimental–numerical study on shape memory behavior of PU/PCL/ZnO ternary blend

2018 ◽  
Vol 30 (1) ◽  
pp. 116-126 ◽  
Author(s):  
M Abbasi-Shirsavar ◽  
M Baghani ◽  
M Taghavimehr ◽  
M Golzar ◽  
M Nikzad ◽  
...  
Keyword(s):  
Shape Memory ◽  
Polymer Composites ◽  
Zno Nanoparticles ◽  
Shape Recovery ◽  
Numerical Study ◽  
Soft Segment ◽  
Shape Memory Polymer ◽  
Ternary Blend ◽  
Recovery Ratio ◽  
Shape Memory Behavior

Shape memory polymer composites have attracted significant attention due to novel properties and great applications. In this article, we focus on the fabrication and simulation of polyurethane/polycaprolactone nanocomposites. The polyurethane/polycaprolactone blends containing ZnO nanoparticles (5 to 30 wt%) are fabricated using a solution mixing and casting method. It is found that significant improvement of polyurethane/polycaprolactone composites in Young’s modulus is achieved by incorporating 20 wt% of ZnO nanoparticles; also, the results of the shape recovery ratio reveal that adding an optimum amount of ZnO (the reinforcement) can increase the shape recovery ratio (for 20 wt% of ZnO). These results could most likely be explained by the fact that some particles restrict the hard segment–soft segment interactions and provide more mobility to polycaprolactone components, while the other nanoparticles can act as the nucleating agent for polycaprolactone chains. A generalized Maxwell model is then used to examine the shape memory behavior of shape memory polymer composites. The dynamic mechanical thermal analysis results are utilized to define the model coefficients and the simulation is carried out to determine the shape recovery ratio. Simulation of this shape recovery ratio for shape memory polymer composites reveals that the numerical results are in good agreement with those of the experimental data.

Shape Fixity and Shape Recovery in a Film of Shape Memory Polymer of Polyurethane Series

1998 ◽  
Vol 9 (2) ◽  
pp. 127-136 ◽  
Author(s):  
H. Tobushi ◽  
T. Hashimoto ◽  
N. Ito ◽  
S. Hayashi ◽  
E. Yamada
Keyword(s):  
Shape Memory ◽  
Shape Recovery ◽  
Shape Memory Polymer ◽  
Shape Fixity

Durability Assessment of Fabric-Reinforced Shape-Memory Polymer Composites

2009 ◽  
Author(s):  
G. P. Tandon ◽  
K. Goecke ◽  
K. Cable ◽  
J. Baur
Keyword(s):  
Shape Memory ◽  
Shape Recovery ◽  
Shape Memory Polymer ◽  
Current State ◽  
Dog Bone ◽  
Measured Weight ◽  
Before And After ◽  
Durability Assessment ◽  
Environmental Durability ◽  
Shape Fixity

The present study is a baseline assessment of the environmental durability of current state-of-the-art, fabric-reinforced shape memory materials being considered for morphing applications. Tensile dog-bone-shaped specimens are cut along three different directions, namely, along 0°, perpendicular (90°), and at 45° to the orientation of the fabric. The shape memory properties and elastomeric response before and after relevant environmental exposure to water at 49°C for 4 days, in lube oil at room temperature and at 49°C for 24 hours, and after exposure to Xenon Arc (63°C, 18 minutes water and light/102 minutes light only) and spectral intensity of 0.3 to 0.4 watts/m2 for 125 cycles (250 hours exposure time) are measured. Weight loss of the as-received and conditioned specimens is monitored while the dog-bone-shaped specimens are subjected to recovery following fixation. Parameters being investigated include stored strain, recovery stress, shape fixity, shape recovery, and modulus in the glassy and rubbery state.

scholarly journals Shape Fixity and Shape Recovery of Polyurethane-Shape Memory Polymer Foam.

2002 ◽  
Vol 68 (675) ◽  
pp. 1594-1599 ◽  
Author(s):  
Hisaaki TOBUSHI ◽  
Shunichi HAYASHI ◽  
Masato ENDO ◽  
Daisuke SHIMADA
Keyword(s):  
Shape Memory ◽  
Shape Recovery ◽  
Shape Memory Polymer ◽  
Polymer Foam ◽  
Shape Memory Polymer Foam ◽  
Shape Fixity
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