Effect of fiber arrangement on shape fixity and shape recovery in thermally activated shape memory polymer-based composites

2012 ◽  
Vol 43 (1) ◽  
pp. 165-173 ◽  
Author(s):  
Masaaki Nishikawa ◽  
Ken Wakatsuki ◽  
Akinori Yoshimura ◽  
Nobuo Takeda
Keyword(s):  
Shape Memory ◽  
Shape Recovery ◽  
Shape Memory Polymer ◽  
Thermally Activated ◽  
Fiber Arrangement ◽  
Shape Fixity

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

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

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.

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

Shape fixity and shape recovery of polyurethane shape-memory polymer foams

2003 ◽  
Vol 217 (2) ◽  
pp. 135-143 ◽  
Author(s):  
H Tobushi ◽  
D Shimada ◽  
S Hayashi ◽  
M Endo
Keyword(s):  
High Temperature ◽  
Shape Memory ◽  
Shape Recovery ◽  
Shape Memory Polymer ◽  
High Temperature Stress ◽  
Thermomechanical Properties ◽  
Recovery Stress ◽  
Original Shape ◽  
Number Of Cycles ◽  
Shape Fixity

The thermomechanical properties of polyurethane shape memory polymer (SMP) foams were investigated experimentally. The results obtained can be summarized as follows. (1) By cooling the foam after compressive deformation at high temperature, stress decreases and the deformed shape is fixed. Stress decreases markedly in the region of temperature below the glass transition temperature Ts during the cooling process. (2) By heating the shape-fixed foam under no load, the original shape is recovered. Strain is recovered markedly at the temperature region in the vicinity of Tg. (3) The ratio of shape fixity is 100 per cent and that of shape recovery 98 per cent. Neither ratio depends on the number of cycles. (4) Recovery stress increases by heating under constraint of the fixed shape. Recovery stress is about 80 per cent of the applied maximum stress. Relaxed stress at high temperature is not recovered. (5) The shape deformed at high temperature is maintained for six months under no load at Tg’60 K without depending on maximum strain, and the original shape is recovered by heating thereafter. (6) If the deformed shape is kept at high temperature, the original shape is not recovered. The factors influencing the shape irrecovery are the holding conditions of strain, temperature, and time.

scholarly journals Development of Thermo-Responsive Polycaprolactone–Polydimethylsiloxane Shrinkable Nanofibre Mesh

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1427
Author(s):  
Chia-Hsuan Hsieh ◽  
Nur Adila Mohd Razali ◽  
Wei-Chih Lin ◽  
Zhi-Wei Yu ◽  
Dwita Istiqomah ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Biomedical Applications ◽  
Memory Performance ◽  
Shape Memory Polymer ◽  
Electrospinning Process ◽  
Degree Of Crystallinity ◽  
Thermal And Mechanical Properties ◽  
Thermally Activated ◽  
Shape Fixity

A thermally activated shape memory polymer based on the mixture of polycaprolactone (PCL) and polydimethylsiloxane (PDMS) was fabricated into the nanofibre mesh using the electrospinning process. The added percentages of the PDMS segment in the PCL-based polymer influenced the mechanical properties. Polycaprolactone serves as a switching segment to adjust the melting temperature of the shape memory electro-spun PCL–PDMS scaffolds to our body temperature at around 37 °C. Three electro-spun PCL–PDMS copolymer nanofibre samples, including PCL6–PDMS4, PCL7–PDMS3 and PCL8–PDMS2, were characterised to study the thermal and mechanical properties along with the shape memory responses. The results from the experiment showed that the PCL switching segment ratio determines the crystallinity of the copolymer nanofibres, where a higher PCL ratio results in a higher degree of crystallinity. In contrast, the results showed that the mechanical properties of the copolymer samples decreased with the PCL composition ratio. After five thermomechanical cycles, the fabricated copolymer nanofibres exhibited excellent shape memory properties with 98% shape fixity and above 100% recovery ratio. Moreover, biological experiments were applied to evaluate the biocompatibility of the fabricated PCL–PDMS nanofibre mesh. Owing to the thermally activated shape memory performance, the electro-spun PCL–PDMS fibrous mesh has a high potential for biomedical applications such as medical shrinkable tubing and wire.

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