Introducing Dynamic Bonds in Light‐based 3D Printing DOI Creative Commons
Guangda Zhu, Hannes A. Houck, Christoph A. Spiegel

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(20)

Published: April 23, 2023

Abstract Light‐based 3D printing has received significant attention due to several advantages including high speed and resolution. Along with the development of new technologies, material design is key for next generation light‐based printing. Conventional printable polymeric materials, also known as photopolymers or photoresins, often lead thermosets–polymer networks cross‐linked by permanent covalent bonds which bring limited adaptability restricted reprocessability. Dynamic that can reversibly break reform enable network rearrangement, thereby offering unprecedented properties materials such adaptability, self‐healing, recycling capabilities. Hence, introducing dynamic into a promising strategy further expand meet diverse application scenarios printed multi‐functional moreover more demanding sustainable nature‐inspired considerations (e.g., self‐healing). Herein, an overview recent advances in printing, aiming bridge these two research fields presented. Importantly, current challenges are analyzed perspectives developing their potential applications provided.

Language: Английский

Dynamic Covalent Polymer Networks: A Molecular Platform for Designing Functions beyond Chemical Recycling and Self-Healing DOI
Ning Zheng, Yang Xu, Qian Zhao

et al.

Chemical Reviews, Journal Year: 2021, Volume and Issue: 121(3), P. 1716 - 1745

Published: Jan. 4, 2021

Dynamic covalent polymer networks (DCPN) have historically attracted attention for their unique roles in chemical recycling and self-healing, which are both relevant sustainable societal development. Efforts these directions intensified the past decade with notable progress newly discovered dynamic chemistry, fundamental material concepts, extension toward emerging applications including energy electronic devices. Beyond that, values of DCPN discovering/designing functional properties not offered by classical thermoplastic thermoset polymers recently gained traction. In particular, bond exchangeability has shown unparalleled design versatility various areas shape-shifting materials/devices, artificial muscles, microfabrication. Going beyond this basic exchangeability, molecular mechanisms to manipulate network topologies (topological transformation) led opportunities program polymers, concepts such as living topological isomerization. review, we provide an overview above particular focuses on strategies exploitation properties. Based this, point out remaining issues offer perspectives how class materials can shape future ways that complementary polymers.

Language: Английский

Citations

916
Dynamic covalent chemistry in polymer networks: a mechanistic perspective DOI Creative Commons
Johan M. Winne, Ludwik Leibler, Filip Du Prez

et al.

Polymer Chemistry, Journal Year: 2019, Volume and Issue: 10(45), P. 6091 - 6108

Published: Jan. 1, 2019

A selection of dynamic chemistries is highlighted, with a focus on the reaction mechanisms molecular network rearrangements, and how mechanistic profiles can be related to mechanical physicochemical properties polymer materials.

Language: Английский

Citations

534
Vitrimers: directing chemical reactivity to control material properties DOI Creative Commons
Marc Guerre, Christian Taplan, Johan M. Winne

et al.

Chemical Science, Journal Year: 2020, Volume and Issue: 11(19), P. 4855 - 4870

Published: Jan. 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

Language: Английский

Citations

451
Reprocessable Cross-Linked Polymer Networks: Are Associative Exchange Mechanisms Desirable? DOI Creative Commons
Benjamin R. Elling, William R. Dichtel

ACS Central Science, Journal Year: 2020, Volume and Issue: 6(9), P. 1488 - 1496

Published: July 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.

Language: Английский

Citations

281
Recent development of repairable, malleable and recyclable thermosetting polymers through dynamic transesterification DOI
Tuan Liu, Baoming Zhao, Jinwen Zhang

et al.

Polymer, Journal Year: 2020, Volume and Issue: 194, P. 122392 - 122392

Published: March 23, 2020

Language: Английский

Citations

280
Vitrimers: Current research trends and their emerging applications DOI Creative Commons
Jie Zheng, Zhuang Mao Png, Shi Hoe Ng

et al.

Materials Today, Journal Year: 2021, Volume and Issue: 51, P. 586 - 625

Published: July 29, 2021

Language: Английский

Citations

279
Facile Preparation of Polyimine Vitrimers with Enhanced Creep Resistance and Thermal and Mechanical Properties via Metal Coordination DOI
Sheng Wang, Songqi Ma, Qiong Li

et al.

Macromolecules, Journal Year: 2020, Volume and Issue: 53(8), P. 2919 - 2931

Published: April 9, 2020

Vitrimers undergoing dynamic bond exchange enable reprocessing and recycle of thermosets. However, vitrimers are susceptible to creep, leading their poor dimensional stability, which limits applications. Here, a facile method via integration metal complexes was utilized address this issue, cross-linked polyimine selected as an example vitrimer. Three different were introduced into vitrimer one-pot preparation involving the formation cross-linking polyimine. The addition 0.5 mol % Cu2+ relative imine reduced creep degree from 30% 20% at 60 °C, resistance enhanced with increasing content. Loading 5 increased initial temperature about 100 °C raised Arrhenius activation energy (Ea) for stress relaxation 52.3 67.7 kJ mol–1. ability suppress followed order Fe3+ > Mg2+, reached around 120 Fe3+. Meanwhile, polyimine–metal complex still exhibited excellent recyclability. Moreover, introduction coordination structures thermal mechanical properties, solvent, acid resistance. Thus, is efficient approach achieve high-temperature resistance, chemical stability based on Schiff base.

Language: Английский

Citations

174
Internal catalysis for dynamic covalent chemistry applications and polymer science DOI
Filip Van Lijsebetten, Joshua O. Holloway, Johan M. Winne

et al.

Chemical Society Reviews, Journal Year: 2020, Volume and Issue: 49(23), P. 8425 - 8438

Published: Jan. 1, 2020

In this review, we provide a concise analysis of internal catalysis as an attractive design principle to combine chemical robustness with reactivity in dynamic covalent chemistry applications and material context.

Language: Английский

Citations

171
Reprocessing Postconsumer Polyurethane Foam Using Carbamate Exchange Catalysis and Twin-Screw Extrusion DOI Creative Commons
Daylan T. Sheppard, Kailong Jin, Leslie S. Hamachi

et al.

ACS Central Science, Journal Year: 2020, Volume and Issue: 6(6), P. 921 - 927

Published: April 29, 2020

Cross-linked polyurethane (PU) is extensively used as thermoset foam; however, methods to directly reprocess PU foam waste derived from commercial sources into similar value materials have not been developed. We demonstrate that introducing dibutyltin dilaurate (DBTDL) cross-linked foams and films enables their reprocessing at elevated temperatures via dynamic carbamate exchange reactions. Both model were continuously reprocessed using twin-screw extrusion remove gaseous filler produce filaments or with elastomeric rigid mechanical properties. The properties of microcompounded in excellent agreement film synthesized the same monomers, indicating this process occurs efficiently. These findings will enable bulk inspire further development for other thermosets compatibilization chemically distinct materials.

Language: Английский

Citations

165
Covalent Adaptable Networks with Tunable Exchange Rates Based on Reversible Thiol–yne Cross‐Linking DOI
Niels Van Herck,

Diederick Maes,

Kamil Unal

et al.

Angewandte Chemie International Edition, Journal Year: 2019, Volume and Issue: 59(9), P. 3609 - 3617

Published: Dec. 17, 2019

Abstract The design of covalent adaptable networks (CANs) relies on the ability to trigger rearrangement bonds within a polymer network. Simple activated alkynes are now used as versatile reversible cross‐linkers for thiols. click‐like thiol–yne cross‐linking reaction readily enables network synthesis from polythiols through double Michael addition with and tunable second step. resulting thioacetal moieties robust but dynamic linkages. A series different have been synthesized systematically probed their produce linkages, both in kinetic studies small molecule models, well stress relaxation creep measurements thiol–yne‐based CANs. results further rationalized by DFT calculations, showing that bond exchange rates can be significantly influenced choice alkyne cross‐linker.

Language: Английский

Citations

163