Elastic work energy density is an increasingly important metric of shape-memory behavior. Existing shape-memory polymers (SMPs) are capable of storing elastic energy exceeding one MJ/m3 at strains greater than 100%. SMPs usually contain a permanent network that can be elastically deformed and mechanically stabilized by a temporary network.
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As the demand for flexible wearable electronic devices increases, the development of light, thin and flexible high-performance energy-storage devices to power them is a research priority. This review highlights the latest research advances in flexible wearable supercapacitors, covering functional classifications such as stretchability, permeability, self
To overcome the drawbacks of previous piezoelectric composite fibers and fabrics with excessive stiffness, this paper explores the fabrication of flexible piezoelectric composite fibers using shape memory polyurethane (SMPU) and lead zirconate titanate (PZT) piezoelectric material through a melt-spinning technique. While the shape recovery
Energy storage in thermoset shape memory polymers happens through entropy reduction during the programming step, but low energy release is known to be a bottleneck for
Shape-memory polymers (SMPs) that respond near body temperature are attracting broad interest, especially in the biomedical fields. {Meng2016BodyTT, title={Body temperature triggered shape-memory polymers with high elastic energy storage capacity}, author={Yuan Meng and Jisu Jiang and Mitchell Anthamatten}, journal={Journal of Polymer
A higher storage modulus typically indicates that SMP can more effectively store elastic potential energy during the shape memory process, thus better maintaining its original shape. On the other hand, the loss modulus represents the measure of elastic energy consumed during the loading process and is associated with the energy dissipated in
This shape memory energy storage device is heated above A f temperature; the deformed shape gets recovered to its original curl shape. This intelligent textile curls the clothes when coming into contact with body temperature. J. Hiltz, Shape Memory Polymers. Literature Review (Literature Review Defence R & D Canada, 2016) Google Scholar
Body temperature triggered shape‐memory polymers with high elastic energy storage capacity. Shape-memory polymers (SMPs) that respond near body temperature are attracting broad interest
Rapid progress in material science and nanotechnology has led to the development of the shape memory alloys (SMA) and the shape memory polymers (SMP) based functional multilayered structures that, due to their capability to achieve the properties not feasible by most natural materials, have attracted a significant attention from the scientific community.
[6, 7] NIR laser beams can be used to cut, weld, hole-punch, sintering of polymers, [8, 9] while IR light, X-rays, and other electromagnetic radiation have been widely used to characterize the chemical structures of polymers. Shape-memory polymers (SMPs) have been attractive in the last two decades and paid great attention from the aspects of
Starting from structural requirements and thermodynamics, quantitative aspects of the SME are discussed in the context of energy storage and release during the damage-repair cycle. Characterization of shape memory in polymers has largely concentrated on recovery and fixation ratios, which describe the efficiency of the geometrical changes.
Energy storage in thermoset shape memory polymers happens through entropy reduction during the programming step, but low energy release is known to be a bottleneck for wide-spread application.
Stored mechanical energy can be locally released by exposure to heat in one-way shape-memory polymers (SMPs) by entropy driven recoiling. A one-way shape-memory polymer is capable of temporarily fixing a mechanical
Figure 1. Achieving high energy density in shape memory polymers using strain-induced supramolecular structures. (a) Combining a flexible backbone polymer (polypropylene glycol, PPG) with a strong and directional hydrogen-bonding unit (methylene bisphenylurea, MPU) creates a tough and stretchable polymer with high network junction density.
Aiming to resolve these challenges, smart electrochemical energy storage devices with shape memory function are being developed, because shape memory material can well serve as a detector. For example, if there is a risk during the use of a battery, it can convey the information in the form of shape and play the role of automatic protection
The giant stress and energy release in the rubbery state will enhance applications of thermoset SMPs in engineering structures and devices. Energy storage in thermoset shape memory polymers happens through entropy reduction during the programming step, but low energy release is known to be a bottleneck for wide-spread application.
Low output in stress and energy in rubbery state has been a bottleneck for wide-spread applications of thermoset shape memory polymers (SMPs). Traditionally, stress or energy storage in thermoset network is through entropy reduction by mechanical deformation or programming.
Body temperature triggered shape-memory polymers with high elastic energy storage capacity. Yuan Meng, Yuan Meng. Department of Chemical Engineering, University of Rochester, 206 Gavett Hall, Rochester,
Polymer smart materials are a broad class of polymeric materials that can change their shapes, mechanical responses, light transmissions, controlled releases, and other functional properties under external stimuli. A good understanding of the aspects controlling various types of shape memory phenomena in shape memory polymers (SMPs), such as
Among various shape-changing materials, the elastic nature of shape memory polymers allows fixation of temporary shapes that can recover on demand, whereas polymers with exchangeable bonds can undergo permanent shape change via plasticity. We integrate the elasticity and plasticity into a single polymer network.
e) Comparison of temperature and volume energy density between PBD 0.5 and other thermosetting polymers possessing shape memory and recyclability features (left) and the enlarged diagram at 20–60 °C (right). f) Schematic, g) initial strain and thermal recovery, and h) shape fixity and shape recovery ratio of the temporarily stretched sample
Shape memory polymers are promising materials in many emerging applications due to their large extensibility and excellent shape recovery. However, practical application of these polymers is
As illustrated by plotting these values on the polymer shape memory prediction plane 11 shown in Fig. 1e, 180 kDa and 72 kDa TPU possess balanced σ and ε storage capabilities as well as high ΔS
Shape-memory polymers (SMPs) possess unique properties that respond to external stimuli. The current review discusses types of SMPs, fabrication methods, and the characterization of their mechanical, thermal, and shape recovery properties. Research suggests that SMP composites, when infused with fillers, demonstrate enhanced mechanical and
A 3D finite strain constitutive model combined viscoelasticity and storage strain for shape memory polymers (SMPs) is proposed. In the shape memory cycle, the thermodynamic free energy of the system is the sum of the strain energy stored in the three springs and the energy related to temperature.
Molecular dynamics simulations were carried out to understand the mechanical and energy storage properties of bisphenyl-A diglycidyl ether cured with isophorone diamine — a thermoset shape memory polymer (TSMP) with both excellent shape memory and stress memory properties. Different cross-linked systems were created to determine which cross-linking
Key structural considerations. Shape-memory behaviour in polymeric systems relies on the controlled storage of entropic energy, the subsequent release of which drives the shape change.
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