Journal ArticleDOI
New Thermally Remendable Highly Cross-Linked Polymeric Materials
TLDR
In this paper, two new remendable highly cross-linked polymers, 2ME4F and 2MEP4F, were prepared without solvent, and they were used to study the thermal reversibility of Diels−Alder (DA) cross-linking, and it was found that DA connections and disconnections are thermally reversible.Abstract:
Two new remendable highly cross-linked polymers, 2ME4F and 2MEP4F, were prepared without solvent. Solid-state NMR (nuclear magnetic resonance) was used to study the thermal reversibility of Diels−Alder (DA) cross-linking, and it was found that DA connections and disconnections of both polymers are thermally reversible. Differential scanning calorimeter and dynamical mechanical analysis were applied to study thermal and mechanical properties of these materials, and it is found that the glass transition temperature (Tg) of 2ME4F is about 30−40 °C and that of 2MEP4F is about 80 °C. A qualitative study of the healing efficiency of 2MEP4F showed that cracks can be healed effectively with a simple thermal healing procedure. This process can be repeated to heal cracks multiple times.read more
Citations
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Self-healing materials with microvascular networks
TL;DR: A self-healing system capable of autonomously repairing repeated damage events via a three-dimensional microvascular network embedded in the substrate is reported, opening new avenues for continuous delivery of healing agents for self-repair as well as other active species for additional functionality.
Journal ArticleDOI
Applications of Orthogonal “Click” Chemistries in the Synthesis of Functional Soft Materials
Rhiannon K. Iha,Karen L. Wooley,Andreas M. Nyström,Daniel J. Burke,Matthew J. Kade,Craig J. Hawker +5 more
TL;DR: This paper aims to demonstrate the efforts towards in-situ applicability of EMMARM, which aims to provide real-time information about the physical properties of EMTs and their applications in the treatment of cancer.
Journal ArticleDOI
Self-healing polymeric materials: A review of recent developments
TL;DR: An overview of various self-healing concepts for polymeric materials published over the last 15 years is presented in this article, where Fracture mechanics of polymeric material and traditional methods of repairing damages in these materials are described to provide context for the topic.
Journal ArticleDOI
Self-Healing Polymers and Composites
Benjamin J. Blaiszik,Sharlotte L. B. Kramer,Solar C. Olugebefola,Jeffrey S. Moore,Nancy R. Sottos,Scott R. White +5 more
TL;DR: Self-healing polymers and fiber-reinforced polymer composites possess the ability to heal in response to damage whenever and whenever it occurs in the material as mentioned in this paper, which is a remarkable property.
Journal ArticleDOI
Self-healing polymers and composites
TL;DR: A survey of self-healing polymers can be found in this article, where the authors review the major successful autonomic repairing mechanisms developed over the last decade and discuss several issues related to transferring these selfhealing technologies from the laboratory to real applications, such as virgin polymer property changes as a result of the added healing functionality.
References
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Journal ArticleDOI
Autonomic healing of polymer composites
Scott R. White,Nancy R. Sottos,Philippe H. Geubelle,Jeffrey S. Moore,Jeffrey S. Moore,Michael R. Kessler,Suresh R. Sriram,Suresh R. Sriram,Eric Brown,S. Viswanathan +9 more
TL;DR: A structural polymeric material with the ability to autonomically heal cracks is reported, which incorporates a microencapsulated healing agent that is released upon crack intrusion and polymerization of the healing agent is triggered by contact with an embedded catalyst, bonding the crack faces.
Journal ArticleDOI
A Thermally Re-mendable Cross-Linked Polymeric Material
Xiangxu Chen,Matheus Adrianus Dam,Kanji Ono,Ajit Mal,Hongbin Shen,Steven Nutt,Kevin Sheran,Fred Wudl +7 more
TL;DR: A transparent organic polymeric material that can repeatedly mend or “re-mend” itself under mild conditions and is a tough solid at room temperature and below with mechanical properties equaling those of commercial epoxy resins.
Journal ArticleDOI
Hopkinson Techniques for Dynamic Recovery Experiments
TL;DR: In this article, a split Hopkinson bar was designed for dynamic recovery, where samples can be subjected to a single pulse of pre-assigned shape and duration, and then recovered without any additional loading, for post-test characterization.
Journal ArticleDOI
Removable foams based on an epoxy resin incorporating reversible Diels-Alder adducts
TL;DR: In this paper, a Diels-Alder reversible chemistry was incorporated into epoxy resins for electronic encapsulation, which can be easily removed by dissolution in 1-butanol at 90 °C.
Journal ArticleDOI
Hot plate welding of plastics: Factors affecting weld strength
TL;DR: This article showed that weld strength is strongly affected by hot plate temperature, heating time and melt flow during welding, and that excessive heating or melt flow produces strong transverse orientation, but in different ways, which can be distinguished by fracture mechanics tests.