Journal ArticleDOI
Poly(vinyl alcohol)-Poly(ethylene glycol) Double-Network Hydrogel: A General Approach to Shape Memory and Self-Healing Functionalities.
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TLDR
A general approach to imparting both the shape memory and self-healing properties to chemically cross-linked hydrogels that otherwise do not have such functionalities is demonstrated.Abstract:
A double-network polymer hydrogel composed of chemically cross-linked poly(ethylene glycol) (PEG) and physically cross-linked poly(vinyl alcohol) (PVA) was prepared. When the hydrogel (70 wt % of water) is subjected to freezing/thawing treatment under strain, the enhanced physical network as a result of crystallization of PVA chains can stabilize the hydrogel deformation after removal of the external force at room temperature. Subsequent disruption of the physical network of PVA by heating allows for the recovery of the initial shape of the hydrogel. Moreover, the double-network hydrogel exhibits self-healing capability stemming from the physical network of PVA by virtue of the extensive interchain hydrogen bonding between the hydroxyl side groups. This study thus demonstrates a general approach to imparting both the shape memory and self-healing properties to chemically cross-linked hydrogels that otherwise do not have such functionalities. Moreover, by making use of the fixed hydrogel elongation, the ef...read more
Citations
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Self-Healing Hydrogels
TL;DR: The trends indicate that hydrogels that self-heal better also achieve self- healing faster, as compared to gels that only partially self- Healing, and the potential relevance of self-Healing hydrogel to the exciting research areas of 3D/4D printing, soft robotics, and assisted health technologies is highlighted.
Journal ArticleDOI
Extremely Stretchable Strain Sensors Based on Conductive Self-Healing Dynamic Cross-Links Hydrogels for Human-Motion Detection.
TL;DR: Extremely stretchable self‐healing strain sensors based on conductive hydrogels are successfully fabricated and have good response, signal stability, and repeatability under various human motion detections.
Journal ArticleDOI
Ultrasensitive Wearable Soft Strain Sensors of Conductive, Self-healing, and Elastic Hydrogels with Synergistic “Soft and Hard” Hybrid Networks
TL;DR: This strategy of building synergistic "soft and hard" structures is successful to integrate the decent mechanical properties, reliable self-healing capability, and high sensing sensitivity together for assembling a high-performance, flexible, and wearable strain sensor.
Journal ArticleDOI
Hydrogel wound dressings for bioactive treatment of acute and chronic wounds
TL;DR: A variety of approaches to bioactive wound healing, such as bioactive dressing materials, use of antimicrobial agents, inclusion of biological signaling molecules like growth factors, and incorporation of seeded stem cells, are considered and critically evaluated.
Journal ArticleDOI
Poly(vinyl alcohol)–Tannic Acid Hydrogels with Excellent Mechanical Properties and Shape Memory Behaviors
TL;DR: The facile fabrication of a novel type of shape memory hydrogel physically cross-linked with both stronger and weaker hydrogen bonding (H-bonding) is reported, which imparts the PVA-TA hydrogels with excellent temperature-responsive shape memory.
References
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Environment-sensitive hydrogels for drug delivery
Yong Qiu,Kinam Park +1 more
TL;DR: Development of environmentally sensitive hydrogels with a wide array of desirable properties can be made is a formidable challenge, however, if the achievements of the past can be extrapolated into the future, it is highly likely that responsive hydrogelWith such properties can been made.
PatentDOI
Shape memory polymers
Robert Langer,Andreas Lendlein +1 more
TL;DR: A very broad, additional spectrum of possible applications for intelligent polymers that covers an area from minimally invasive surgery, through high-performance textiles, up to self-repairing plastic components in every kind of transportation vehicles.
Journal ArticleDOI
Review of progress in shape-memory polymers
TL;DR: It is discussed how the described shape-memory polymers show great potential for diverse applications, including in the medical arena, sensors, and actuators, and as dictated by macromolecular details.
Journal ArticleDOI
Why are double network hydrogels so tough
TL;DR: In this article, double-network gels are characterized by a special network structure consisting of two types of polymer components with opposite physical natures: the minor component is abundantly crosslinked polyelectrolytes (rigid skeleton) and the major component comprises of poorly cross-linked neutral polymers (ductile substance).
Journal ArticleDOI
Shape-memory polymers
Marc Behl,Andreas Lendlein +1 more
TL;DR: Shape-memory polymers as discussed by the authors are an emerging class of active polymers that can change their shape in a predefined way from shape A to shape B when exposed to an appropriate stimulus.