scholarly journals Shape Memory Materials from Rubbers

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7216
Author(s):  
Arunima Reghunadhan ◽  
Keloth Paduvilan Jibin ◽  
Abitha Vayyaprontavida Kaliyathan ◽  
Prajitha Velayudhan ◽  
Michał Strankowski ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Smart Materials ◽  
Metal Alloys ◽  
Second Phase ◽  
Polymer Properties ◽  
Thermomechanical Cycle ◽  
Shape Memory Materials ◽  
Shape Fixity

Smart materials are much discussed in the current research scenario. The shape memory effect is one of the most fascinating occurrences in smart materials, both in terms of the phenomenon and its applications. Many metal alloys and polymers exhibit the shape memory effect (SME). Shape memory properties of elastomers, such as rubbers, polyurethanes, and other elastomers, are discussed in depth in this paper. The theory, factors impacting, and key uses of SME elastomers are all covered in this article. SME has been observed in a variety of elastomers and composites. Shape fixity and recovery rate are normally analysed through thermomechanical cycle studies to understand the effectiveness of SMEs. Polymer properties such as chain length, and the inclusion of fillers, such as clays, nanoparticles, and second phase polymers, will have a direct influence on the shape memory effect. The article discusses these aspects in a simple and concise manner.

Phase Transitions and Elementary Processes in Shape Memory Alloys

2015 ◽  
Vol 1101 ◽  
pp. 124-128
Author(s):  
Osman Adiguzel
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Smart Materials ◽  
Structural Changes ◽  
Elementary Processes ◽  
Cooperative Movement ◽  
Β Phase

Shape memory effect is a peculiar property exhibited by certain alloy systems, and shape memory alloys are recognized to be smart materials. These alloys have important ability to recover the original shape of material after deformation, and they are used as shape memory elements in devices due to this property. The shape memory effect is facilitated by a displacive transformation known as martensitic transformation. Shape memory effect refers to the shape recovery of materials resulting from martensite to austenite transformation when heated above reverse transformation temperature after deforming in the martensitic phase. These alloys also cycle between two certain shapes with changing temperature.Martensitic transformations occur with cooperative movement of atoms by means of lattice invariant shears on a {110} - type plane of austenite matrix which is basal plane of martensite.Copper based alloys exhibit this property in metastable β-phase field. High temperature β-phase bcc-structures martensiticaly undergo the non-conventional structures following two ordered reactions on cooling, and structural changes in nanoscale level govern this transition cooling. Atomic movements are also confined to interatomic lengths due to the diffusionless character of martensitic transformation.

Influence of Radialization Dosage on Shape Memory Effect of Polystyrene Copolymer

2008 ◽  
Vol 47-50 ◽  
pp. 690-693 ◽  
Author(s):  
Da Wei Zhang ◽  
Jin Song Leng ◽  
Yan Ju Liu
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Smart Materials ◽  
Shape Recovery ◽  
Memory Performance ◽  
Shape Memory Polymer ◽  
Shape Memory Polymers ◽  
Mechanical Analysis ◽  
Styrene Copolymer

This paper is concerned about the synthesis of shape memory styrene copolymer and the investigation of the influence of radialization dosage on its shape memory effect. As one of novel actuators in smart materials, shape memory polymers (SMPs) have been investigated intensively. Styrene copolymer with proper cross-linking degree can exhibit shape memory effect (SME). In this paper, the influence of radialization on shape memory effect of styrene copolymer was investigated through altering the dosage of radialization. The radialization dosage of styrene copolymer was determined by changed radicalization time. The glass transition temperature (Tg) of styrene copolymerwas measured by Dynamic Mechanical Analysis (DMA). The shape memory performance of styrene copolymer with different radiated dosage was also evaluated. Results indicated that the shape memory polymer (SMP) was synthesized successfully. The Tg increased from 60°C to 65°C followed by increasing the radialization dosage. Moreover, the SMP experienced good SME and the largest reversible strain of the SMP reached as high as 150%. When heating above Tg+30°C (different copolymers performed different Tg), the shape recovery speed of the copolymers increased with increasing the radialization dosage. However, the recovery speed decreased with increasing the radialization dosage at the same temperature of 95°C.

Ensuring Reliability of Lithium-Ion Batteries for Space Applications Using Functional Shape Memory Materials

2013 ◽  
Vol 772 ◽  
pp. 693-698 ◽  
Author(s):  
Zh.M. Blednova ◽  
N.A. Protsenko
Keyword(s):  
Shape Memory ◽  
Lithium Ion Batteries ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Lithium Ion ◽  
Space Applications ◽  
Contact Group ◽  
Shape Memory Materials ◽  
Performance Check

The developed design of a bypass device with thermo-mechanical converter based on a material with shape memory effect, allowing for multiple performance check at the stage of construction and testing, and ensuring the required level of reliability at reduced weight and size characteristics is described. On the base of the proposed models of bypass actuator a technology is developed for the manufacturing of power contact group that allows obtaining minimal transient resistance of contacts.

Mechanism of Deformation by Intervariant Boundary Motion in Shape-Memory Materials

2000 ◽  
Vol 652 ◽  
Author(s):  
Robert C. Pond ◽  
Steven Celotto
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Applied Stress ◽  
Thermal Activation ◽  
Atomistic Simulations ◽  
Boundary Motion ◽  
Martensitic State ◽  
Shape Memory Materials ◽  
Applied Stresses

ABSTRACTThe shape-memory effect relies on deformation in the martensitic state by motion of intervariant boundaries in response to an applied stress. A mechanism for this process in terms of interfacial defect generation, motion and interaction is proposed. This mechanism is conservative and is expected to operate with modest applied stresses and without thermal activation. Experimental observations of intervariant boundaries are discussed and atomistic simulations of the mechanism in such boundaries in hexagonal metals are presented.

Processing of Cu-Al-Ni and Cu-Zn-Al Alloys by Mechanical Alloying

2012 ◽  
Vol 727-728 ◽  
pp. 200-205 ◽  
Author(s):  
André Victor Traleski ◽  
Selauco Vurobi Jr. ◽  
Osvaldo Mitsuyuki Cintho
Keyword(s):  
Mechanical Alloying ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Weight Ratio ◽  
High Energy ◽  
Al Alloys ◽  
Al Alloy ◽  
Second Phase ◽  
Metal Powders

The mechanical alloying process provides alloys with extremely refined microstructure, reducing the need for alloying elements to grain growth restriction, as in casting techniques. The Cu-Al-Ni and Cu-Zn-Al alloys produced by casting may have the shape memory effect when plastically deformed at relatively low temperatures, returning to its original shape upon heating at a given temperature. This work aimed at the production of Cu-Al-Ni and Cu-Zn-Al alloys by mechanical alloying, followed by microstructural characterization and investigation of the shape memory effect by means of differential scanning calorimetry (DSC). Metal powders of Cu, Al, Ni and Cu, Zn, Al were processed in a SPEX high energy vibratory mill during 8 hours, with ball-to-powder weight ratio of 5:1. The milled products were characterized by X-ray diffraction. For each alloy, specimens with 8 mm diameter and 2 mm thickness were shapes by uniaxial pressing, sintered in a tube furnace with argon atmosphere, solubilized and then quenched in water. Samples were characterized by optical and scanning electron microscopy (SEM), Vickers hardness testing and DSC. An ultrafine microstructure was obtained in the Cu-Al-Ni alloy but the shape memory effect was not detected by DSC analysis because of second phase precipitation. The shape memory effect was not present in the Cu-Zn-Al alloy also, because of zinc oxidation during the sintering.

Smart Materials of Cured Epoxy Polymer Modified by 6F-PEEK with Shape Memory Effect

2010 ◽  
Vol 152-153 ◽  
pp. 530-535 ◽  
Author(s):  
Jun Peng Gao ◽  
Chen Qian Zhang ◽  
Xian Cheng He ◽  
Hong Yi Ma ◽  
Xue Feng An ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Smart Materials ◽  
Shape Recovery ◽  
Epoxy Polymer ◽  
Memory Effects ◽  
Retention Rates ◽  
Thermally Induced ◽  
Shape Memory Effects

We demonstrated a method of fabricating thermosetting epoxy polymer with shape memory effect modified Poly (ether ether ketone) (6F-PEEK) based on the formation of a phase-segregated morphology. The peculiarities of shape memory effects of the epoxy resin modified by 6F-PEEK were investigated. DMA result showed two glass transition temperatures in this blended material. The cured epoxy phase showing high Tg of 223oC acted as hard-segment-forming phase the and was responsible for the permanent shape. The 6F-PEEK can be used as switching phase for a thermally induced shape-memory effect. The transition temperature (Ttran) was 150oC, which was between the Tg of cured epoxy and 6F-PEEK. At the special concentrations of 6F-PEEK, the shape memory effect accompanied by a significant increase in volume was observed. The highest shape memory effect was obtained for the blended material with 25.00 wt% of 6F-PEEK. The shape retention rates and the shape recovery rates were 96-99% and 100%, respectively. The times of shape-recovery were all defined in 2 min. The mechanism of shape memory effects and the mechanical properties of the cured resin were discussed.

A Mechanism for Magnetically Driven Shape Memory Alloys

1999 ◽  
Vol 604 ◽  
Author(s):  
P. J. Ferreira ◽  
J. B. Vander Sande
Keyword(s):  
Magnetic Field ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Maximum Pressure ◽  
Second Phase ◽  
Magnetic Field Direction ◽  
Second Phase Particles ◽  
The Magnetic Field

AbstractA mechanism for shape memory alloys driven by a magnetic field is proposed. The mechanism involves the motion of twin dislocations in response to the application of a magnetic field. As a consequence, twin variants oriented favorably with respect to the magnetic field direction will grow. The maximum pressure that can be exerted at the twin dislocations is when the magnetic field is at angle . The shape memory effect is significantly affected by the presence of impurities, second-phase particles and grain boundaries

Materials Development of Thin Film TiNi Ferroelastic-Ferroelectric Heterostructures

1992 ◽  
Vol 276 ◽  
Author(s):  
A. Peter Jardine
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Smart Materials ◽  
Growth Conditions ◽  
Materials Development ◽  
Amorphous Thin Films ◽  
Thermodynamic Conditions

ABSTRACTActive and adaptive thin film materials for “smart” materials will likely be a heterostructure of several types of thin films. In this investigation, deposition and processing of thin film Shape Memory Effect TiNi and thin film ferroelectric BaTiO3 and SrTiO3 are discussed. Growth conditions as well as the thermodynamic conditions for thin films are described. It was found that amorphous thin films of TiNi and BaTiO3 can be crystallized simultaneously by air annealing at 600°C.

Dual-shape memory effect in radiation crosslinked thermoplastic blends: fabrication, optimization and mechanisms

RSC Advances ◽  
2015 ◽  
Vol 5 (76) ◽  
pp. 61601-61611 ◽  
Author(s):  
Xiang Shi ◽  
Xuemei Wang ◽  
Chao Fu ◽  
Xianghai Ran
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Smart Materials ◽  
Shape Memory Polymers ◽  
Important Class ◽  
Thermoplastic Blends ◽  
Manufacturing Techniques

Recently, as an important class of mechanically active smart materials, thermoplastic dual-shape memory polymers (SMPs) have attracted notable attention and can be fabricated in many different manufacturing techniques.

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