A facile access to stiff epoxy vitrimers with excellent mechanical properties <i>via</i> siloxane equilibration

Wu, Xiao‐Feng; Yang, Xin; Yu, Ran; Zhao, Xiaojuan; Zhang, Ying; Huang, Wei

doi:10.1039/c8ta02102c

Cited by 164 publications

(125 citation statements)

References 39 publications

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“…Using SiO 2 nanoparticles as cross-linkers, recently trials have been made (with the thus created interfacial silyl ether linkages) for epoxy polymers (as vitrimers) towards improving selfhealing and mechanical performances. [230] Legrand et al [231] demonstrated the effect of SiO 2 surface chemistry on the relaxation dynamics in epoxy vitrimer PNCs (Figure 28). The authors found that functionalization of SiO 2 aided in covalent cross-links in the vitrimer matrix via exchangeable bonds and occurred both in the bulk network and at the epoxy-SiO 2 interface.…”

Section: Vitrimers In Self-healing Materialsmentioning

confidence: 99%

“…Vitrimers follow the Arrhenius law in exhibiting the gradual thermal viscosity behavior, that endowed the composites with glass-like malleability and reprocessability without any precise temperature control. [222][223] To date, a variety of exchangeable chemical reactions [223][224][225][226][227][228][229][230] (transesterification, transalkylation, transamination, olefin metathesis, boroxine metathesis, disulfide, imine and siloxane-silanol exchange) have been explored in the context of vitrimers, to improve and expand both the performance and gallery of vitrimer materials. Using SiO 2 nanoparticles as cross-linkers, recently trials have been made (with the thus created interfacial silyl ether linkages) for epoxy polymers (as vitrimers) towards improving selfhealing and mechanical performances.…”

Section: Vitrimers In Self-healing Materialsmentioning

confidence: 99%

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Design Principles of Interfacial Dynamic Bonds in Self‐Healing Materials: What are the Parameters?

Sattar

Patnaik

2020

Chemistry An Asian Journal

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Polymers and polymer nanocomposites (PNCs) are extensively used in daily life. However, the growing requirement of advanced PNCs laid persistent environmental issues due to deformation‐induced damage that once formed, does not vanish at future stages. Therefore, self‐healing materials with significantly enhanced long life and safety have been designed to epitomize the forefront of recent advances in materials chemistry and engineering. Self‐healing PNC (SH‐PNCs) materials are a class of smart composites in which nanoparticles induce interfacial reconstruction via multiple covalent and non‐covalent interactions culminating in improved mechanical strength and self‐healing capability. However, since the filler nanoparticles are independent of the reversible supramolecular network, the filler incorporation destroys the self‐healing ability but could enhance the mechanical strength. Hence, the molecular parameters controlling the alliance of robust mechanical strength with virtuous self‐healing ability is a crucial challenge. Herein, we review the latest developments that have been made in self‐healing materials and puts advancing insights into the fabrication of SH‐PNCs in which the combination of covalent bonds and non‐covalent interactions provides an optimal balance between their mechanical performance and self‐healing capability. We highlight the importance of specific entropic, enthalpic changes, polymer chain conformations and flexibility that enable the reconstruction of damaged surface and physical reshuffling of dynamic bonds at the interface of cut surfaces.

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Section: Vitrimers In Self-healing Materialsmentioning

confidence: 99%

Section: Vitrimers In Self-healing Materialsmentioning

confidence: 99%

Design Principles of Interfacial Dynamic Bonds in Self‐Healing Materials: What are the Parameters?

Sattar

Patnaik

2020

Chemistry An Asian Journal

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“…Indeed, this silicone rubber material showed self‐healing properties after being heated at 90 °C for 24 h (Figure B). Since the report of Zheng and McCarthy, several groups further explored this chemistry in various dynamic materials . Recently, Seiffert et al.…”

Section: Si−o Exchange In Siloxanes and Silyl Ethersmentioning

confidence: 99%

Dynamic Covalent Bonds in Polymeric Materials

2019

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Dynamic covalent bonds (DCBs) have received significant attention over the past decade. These are covalent bonds that are capable of exchanging or switching between several molecules. Particular focus has recently been on utilizing these DCBs in polymeric materials. Introduction of DCBs into a polymer material provides it with powerful properties including self‐healing, shape‐memory properties, increased toughness, and ability to relax stresses as well as to change from one macromolecular architecture to another. This Minireview summarizes commonly used powerful DCBs formed by simple, often “click” reactions, and highlights the powerful materials that can result. Challenges and potential future developments are also discussed.

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“…In the above sections, various representative vitrimerization methodologies for industrial polymers were described. Of course, the vitrimerization of other non-classifiable polymers with unique functions, e.g., strong hydrophobicity or hydrophilicity, have been reported by several groups [71][72][73]. In addition to the abovementioned examples, there are recent trends in the vitrimer molecular designs.…”

Section: Other Trends For the Practical Application Of The Vitrimer Cmentioning

confidence: 99%

Implantation of Recyclability and Healability into Cross-Linked Commercial Polymers by Applying the Vitrimer Concept

Hayashi

2020

Polymers

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Vitrimers are a new class of cross-linked materials that are capable of network topology alternation through the associative dynamic bond-exchange mechanism, which has recently been invented to solve the problem of conventional cross-linked materials, such as poor recyclability and healability. Thus far, the concept of vitrimers has been applied to various commercial polymers, e.g., polyesters, polylactides, polycarbonates, polydimethylsiloxanes, polydienes, polyurethanes, polyolefins, poly(meth)acrylates, and polystyrenes, by utilizing different compatible bond-exchange reactions. In this review article, the concept of vitrimers is described by clarifying the difference from thermoplastics and supramolecular systems; in addition, the term “associative bond-exchange” in vitrimers is explained by comparison with the “dissociative” term. Several useful functions attained by the vitrimer concept (including recyclability and healability) are demonstrated, and recent molecular designs of vitrimers are classified into groups depending on the types of molecular frameworks. This review specifically focuses on the vitrimer molecular designs with commercial polymer-based frameworks, which provide useful hints for the practical application of the vitrimer concept.

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A facile access to stiff epoxy vitrimers with excellent mechanical properties via siloxane equilibration

Abstract: Recycling process of epoxy vitrimers based on siloxane equilibration.

Cited by 164 publications

References 39 publications

Design Principles of Interfacial Dynamic Bonds in Self‐Healing Materials: What are the Parameters?

Design Principles of Interfacial Dynamic Bonds in Self‐Healing Materials: What are the Parameters?

Dynamic Covalent Bonds in Polymeric Materials

Implantation of Recyclability and Healability into Cross-Linked Commercial Polymers by Applying the Vitrimer Concept

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