Adaptable Crosslinks in Polymeric Materials: Resolving the Intersection of Thermoplastics and Thermosets

Journal of the American Chemical Society, Год журнала: 2019, Номер 141(41), С. 16181 - 16196

Опубликована: Сен. 16, 2019

The classical division of polymeric materials into thermoplastics and thermosets based on covalent network structure often implies that these categories are distinct irreconcilable. Yet, the past two decades have seen extensive development bridge this gap through incorporation dynamic crosslinks, enabling them to behave as both robust networks moldable plastics. Although their potential utility is significant, growth adaptable (CANs) has obscured line between "thermoplastic" "thermoset" erected a conceptual barrier growing number new researchers entering discipline. This Perspective aims outline fundamental theory CANs provide critical assessment current status. We emphasize throughout unique properties emerge from chemistry, particularly highlight role crosslink exchange mechanism (i.e., dissociative or associative exchange) plays in resultant material under processing conditions. Predominant focus will be thermally induced behavior, majority presently employed chemistries rely thermal stimulus, it simple apply bulk materials. Lastly, identify issues address possible solutions for better understanding within field.

Язык: Английский

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Vitrimers: Permanently crosslinked polymers with dynamic network topology

Progress in Polymer Science, Год журнала: 2020, Номер 104, С. 101233 - 101233

Опубликована: Март 15, 2020

Язык: Английский

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Vitrimers: directing chemical reactivity to control material properties

Chemical Science, Год журнала: 2020, Номер 11(19), С. 4855 - 4870

Опубликована: Янв. 1, 2020

In this minireview, we survey recent advances in the development of vitrimer materials. Focus on how to chemically control their material properties is used highlight challenges for boosting potential emerging class polymer

Язык: Английский

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A fully bio-based epoxy vitrimer: Self-healing, triple-shape memory and reprocessing triggered by dynamic covalent bond exchange

Materials & Design, Год журнала: 2019, Номер 186, С. 108248 - 108248

Опубликована: Ноя. 12, 2019

Vitrimers are a new type of polymers with promising applications in innovative materials. Epoxidized soybean oil (ESO) is an ideal candidate for vitrimer preparation owing to its abundant epoxy groups. However, preparing plant oil-based vitrimers high glass transition temperatures (Tg) and strength remains challenging. A novel fully bio-based Tg above room temperature was synthesized from ESO rosin derivative-fumaropimaric acid (FPA) exhibited excellent self-healing, shape memory, reprocessing due the presence dynamic covalent bond exchange. The ESO-FPA 65 °C tensile 16 MPa, which resulted rigid structure tricarboxylic groups FPA. effect transesterification reactions on network confirmed through stress relaxation. Our work expands commercial materials provides approach prepare desirable properties.

Язык: Английский

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Reprocessable Cross-Linked Polymer Networks: Are Associative Exchange Mechanisms Desirable?

ACS Central Science, Год журнала: 2020, Номер 6(9), С. 1488 - 1496

Опубликована: Июль 29, 2020

Covalent adaptable networks (CANs) are covalently cross-linked polymers that may be reshaped via cross-linking and/or strand exchange at elevated temperatures. They represent an exciting and rapidly developing frontier in polymer science for their potential as stimuli-responsive materials to make traditionally nonrecyclable thermosets more sustainable. CANs whose cross-links undergo associative intermediates rather than dissociating separate reactive groups termed vitrimers. Vitrimers were postulated attractive subset of CANs, because cross-link mechanisms maintain the original density network throughout process. As a result, demonstrate gradual, Arrhenius-like reduction viscosity temperatures while maintaining mechanical integrity. In contrast, reprocessed by dissociation reformation have been exhibit rapid decrease with increasing temperature. Here, we survey stress relaxation behavior all dissociative which variable temperature or data reported date. All Arrhenius relationship between viscosity, only small percentage broken instantaneously under typical reprocessing conditions. such, show nearly identical over broad ranges typically used reprocessing. Given term vitrimer was coined highlight temperature, analogy vitreous glasses, discourage its continued use describe CANs. The realization mechanism does not greatly influence practical most suggests chemistries can considered fewer constraints, focusing instead on activation parameters, synthetic convenience, application-specific considerations.

Язык: Английский

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Vitrimers: Current research trends and their emerging applications

Materials Today, Год журнала: 2021, Номер 51, С. 586 - 625

Опубликована: Июль 29, 2021

Язык: Английский

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Intrinsically Self-Healing Polymers: From Mechanistic Insight to Current Challenges

Chemical Reviews, Год журнала: 2022, Номер 123(2), С. 701 - 735

Опубликована: Дек. 28, 2022

Self-healing materials open new prospects for more sustainable technologies with improved material performance and devices' longevity. We present an overview of the recent developments in field intrinsically self-healing polymers, broad class based mostly on polymers dynamic covalent noncovalent bonds. describe current models mechanisms discuss several examples systems different types bonds, from various hydrogen bonds to The advances indicate that most intriguing results are obtained have combined These demonstrate high toughness along a relatively fast rate. There is clear trade-off relationship between rate mechanical modulus materials, we propose design principles toward surpassing this trade-off. also applications summarize challenges field. This review intends provide guidance intrinsic required properties.

Язык: Английский

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Future of additive manufacturing: Overview of 4D and 3D printed smart and advanced materials and their applications

Chemical Engineering Journal, Год журнала: 2020, Номер 403, С. 126162 - 126162

Опубликована: Июль 7, 2020

Язык: Английский

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Upcycling and catalytic degradation of plastic wastes

Cell Reports Physical Science, Год журнала: 2021, Номер 2(8), С. 100514 - 100514

Опубликована: Июль 22, 2021

Various recycling technologies have been developed to deal with plastic problems, but they face considerable economic and technological challenges in practice. An attractive alternative is upcycling, which aims dig out the embedded value incentivize large-scale valorization of wastes. The degradation nonrecoverable wastes another necessity treat omnipresent pollution. This review presents an overview on conversion toward value-added products catalytic Based examination traditional products, we summarize state-of-the-art design development high-value high-performance fuels, chemicals, materials. Subsequently, highlight advances plastics environmentally benign or degradable mineralization into carbon dioxide water. We conclude our perspective ongoing challenge opportunities.

Язык: Английский

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Block Copolymer Vitrimers

Journal of the American Chemical Society, Год журнала: 2019, Номер 142(1), С. 283 - 289

Опубликована: Дек. 3, 2019

In this report, we merge block copolymers with vitrimers in an effort to realize the prospect of higher-order, nanoscale control over associative cross-link exchange and flow. We show use controlled polymerization as a vital tool understand fundamental structure–property effects through precise polymer architecture molecular weight. Vitrimers derived from self-assembling exhibit superior resistance macroscopic deformation comparison their analogs generated statistical copolymers. Our results suggest that enhanced creep achieved by chain topology can be used tune viscoelastic properties. The arises microphase-separated structure new class materials differentiates counterparts introduces potential topology-control

Язык: Английский

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