Thermomechanical properties in a thin film of shape memory polymer of polyurethane series

1996 ◽  
Author(s):  
Hisaaki Tobushi ◽  
Hisashi Hara ◽  
Etsuko Yamada ◽  
Shunichi Hayashi
Keyword(s):  
Thin Film ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Thermomechanical Properties

Thermomechanical properties in a thin film of shape memory polymer of polyurethane series

1996 ◽  
Vol 5 (4) ◽  
pp. 483-491 ◽  
Author(s):  
Hisaaki Tobushi ◽  
Hisashi Hara ◽  
Etsuko Yamada ◽  
Shunichi Hayashi
Keyword(s):  
Thin Film ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Thermomechanical Properties

Investigate of Electrical Conductivity of Shape-Memory Polymer Filled with Carbon Black

2008 ◽  
Vol 47-50 ◽  
pp. 714-717 ◽  
Author(s):  
Xin Lan ◽  
Jin Song Leng ◽  
Yan Ju Liu ◽  
Shan Yi Du
Keyword(s):  
Electrical Conductivity ◽  
Carbon Black ◽  
Shape Memory ◽  
Shape Recovery ◽  
Volume Fraction ◽  
Shape Memory Polymer ◽  
Recovery Process ◽  
Thermomechanical Properties ◽  
Electrically Conductive ◽  
New System

A new system of thermoset styrene-based shape-memory polymer (SMP) filled with carbon black (CB) is investigated. To realize the electroactive stimuli of SMP, the electrical conductivity of SMP filled with various amounts of CB is characterized. The percolation threshold of electrically conductive SMP filled with CB is about 3% (volume fraction of CB), which is much lower than many other electrically conductive polymers. When applying a voltage of 30V, the shape recovery process of SMP/CB(10 vol%) can be realized in about 100s. In addition, the thermomechanical properties are also characterized by differential scanning calorimetery (DSC).

Thermomechanical properties of shape memory polymer subjected to tension in various conditions

2009 ◽  
Vol 6 (2) ◽  
pp. 189-205 ◽  
Author(s):  
Elzbieta A. Pieczyska ◽  
Wojciech K. Nowacki ◽  
Hisaaki Tobushi ◽  
Shunichi Hayashi
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Thermomechanical Properties

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.

Solution-deposited Al2O3 dielectric towards fully-patterned thin film transistors on shape memory polymer

2017 ◽  
Author(s):  
Trey B. Daunis ◽  
Gerardo Gutierrez-Heredia ◽  
Ovidio Rodriguez-Lopez ◽  
Jian Wang ◽  
Walter E. Voit ◽  
...  
Keyword(s):  
Thin Film ◽  
Shape Memory ◽  
Thin Film Transistors ◽  
Shape Memory Polymer

scholarly journals Temperature sensing and actuating capabilities of polymeric shape memory composite containing thermochromic particles

2015 ◽  
Vol 44 (4) ◽  
pp. 224-231 ◽  
Author(s):  
Haibao Lu ◽  
Yongtao Yao ◽  
Long Lin
Keyword(s):  
Shape Memory ◽  
Information Dissemination ◽  
Shape Memory Polymer ◽  
Thermomechanical Properties ◽  
Temperature Sensing ◽  
Content Type ◽  
Thermally Responsive ◽  
Shape Memory Composites ◽  
Potential Applications ◽  
Shape Memory Composite

Purpose – This paper aims to create and to study multifunctional shape memory polymer (SMP) composites having temperature-sensing and actuating capabilities by embedding thermochromic particles within the polymer matrix. Design/methodology/approach – The multifunctional materials were fabricated following a process consisting of blending (of the thermochromic particles and the SMP at various ratios), mixing, degasing, moulding and thermal curing, prepared by incorporating thermochromic particles within the polymer. The effect of the thermochromic particles on the thermomechanical properties and thermally responsive shape memory effect of the resulting multifunction SMP composites were characterised and interpreted. Findings – It was found that exposure of the composites to temperatures above 70°C led to a pronounced change of their colour that was recorded by the thermal and electrical actuation approaches and was reproducibly reversible. It was also found that the colour of the composites was independent of the mechanical state of the SMP. Such effects enabled monitoring of the onset of the set/release temperature of the SMP matrix. Furthermore, the combination of thermochromic additive and the SMP resulted in significantly improved thermomechanical strength, absorption of infrared radiation and the temperature distribution of the SMP composites. Research limitations/implications – The temperature-sensing and actuating capabilities of the polymeric shape memory composites developed through this study will help to extend the field of potential applications of such composites to fields including sensors, actuators, security labels and information dissemination, where colour indication is an advantageous feature. Originality/value – The SMP composites capable of temperature sensing and actuating are novel.

Use of the shape memory polymer polystyrene in the creation of thin film stretchable sensors for wearable applications

2016 ◽  
Author(s):  
Kyle R. Van Volkinburg ◽  
Thao Nguyen ◽  
Jonathan D. Pegan ◽  
Michelle Khine ◽  
Gregory N. Washington
Keyword(s):  
Thin Film ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
The Creation ◽  
Stretchable Sensors

Actuation of Shape Memory Polymer by Resistive Heating of Carbon Nanopaper

2009 ◽  
Author(s):  
Haibao Lu ◽  
Yong Tang ◽  
Jihua Gou ◽  
Erin Chow ◽  
Jinsong Leng ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Recovery ◽  
Carbon Nanofiber ◽  
Volume Fraction ◽  
Shape Memory Polymer ◽  
Mechanical Analysis ◽  
Thermomechanical Properties ◽  
Paper Sheet ◽  
Scanning Electron ◽  
Properties Of Composites

To electrically activate the shape recovery in a styrene-based shape-memory polymer (SMP) by coating with conductive carbon nanofiber paper has been demonstrated in this paper. Carbon nanofibers in the form of paper sheet in combination with SMP significantly improve the electrical and thermal conductivity of polymer, leading to the actuation of SMP/nanopaper composite (with 15% volume fraction of carbon nanopaper, dimension of 10.0 cm × 0.5 cm × 0.3 cm) can be carried out by applying 8.4 V voltage, with response time of 140 s. Therefore, electrical conductivity of 6.6 S/cm is obtained. This approach, although demonstrated in styrene-based polymer, is applicable to other type of SMP materials. Furthermore, the morphologies of carbon nanofiber in the form of paper is observed by scanning electron microscopy, and the thermomechanical properties of composites are measured and analyzed by dynamic mechanical analysis.

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