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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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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Rheological Properties of Covalent Adaptable Networks with 1,2,3-Triazolium Cross-Links: The Missing Link between Vitrimers and Dissociative Networks

Macromolecules, Год журнала: 2020, Номер 53(6), С. 1884 - 1900

Опубликована: Март 9, 2020

Vitrimers, in stringent contrast to dissociative networks, involve associative covalent exchanges and remain fully cross-linked at all temperatures. However, we have previously reported on poly(1,2,3-triazolium) dynamic networks that exhibit linear rheological characterization indistinguishable from vitrimers although being based a exchange process, i.e., de-N-alkylation re-N-alkylation reactions. Herein, highlight the main features of adaptable (CANs) discuss their respective behaviors. After giving detailed overview extent potential polymer having 1,2,3-triazolium cross-links particular CANs involving trans-N-alkylation general, perform comparative described aliphatic 1,2,3-triazolium-based new bicomponent thermosetting system issued mixing polystyrene chains complementary benzyl iodide 1,2,3-triazole pendent groups. We propose simple but comprehensive methodology enables proper comparison between types CANs, networks. Owing combination high glass transition temperature network fast this network, it is possible characterize both relaxation with single experiments. provide clear experimental evidence located within narrow range, dependences these two transitions are distinct follow WLF Arrhenius models, respectively.

Язык: Английский

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Biobased vitrimers: Towards sustainable and adaptable performing polymer materials

Progress in Polymer Science, Год журнала: 2022, Номер 127, С. 101515 - 101515

Опубликована: Янв. 12, 2022

Язык: Английский

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Bulk network polymers with dynamic B–O bonds: healable and reprocessable materials

Materials Horizons, Год журнала: 2019, Номер 7(3), С. 694 - 714

Опубликована: Ноя. 1, 2019

The recent progress in healable and reprocessable bulk network polymers with dynamic B–O bonds is reviewed.

Язык: Английский

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Reprocessing Postconsumer Polyurethane Foam Using Carbamate Exchange Catalysis and Twin-Screw Extrusion

ACS Central Science, Год журнала: 2020, Номер 6(6), С. 921 - 927

Опубликована: Апрель 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.

Язык: Английский

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Covalent Adaptable Networks with Tunable Exchange Rates Based on Reversible Thiol–yne Cross‐Linking

Angewandte Chemie International Edition, Год журнала: 2019, Номер 59(9), С. 3609 - 3617

Опубликована: Дек. 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.

Язык: Английский

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The Impact of Vitrimers on the Industry of the Future: Chemistry, Properties and Sustainable Forward-Looking Applications

Polymers, Год журнала: 2020, Номер 12(8), С. 1660 - 1660

Опубликована: Июль 26, 2020

Thermosets are known to be very reliable polymeric materials for high-performance and light-weight applications, due their retained dimensional stability, chemical inertia rigidity over a broad range of temperatures. However, once fully cured, they cannot easily reshaped or reprocessed, thus leaving still unsolved the issues recycling lack technological flexibility. Vitrimers, introduced by Leibler et al. in 2011, valiant step direction bridging chasm between thermoplastics thermosets. Owing dynamic covalent networks, can retain mechanical stability solvent resistance, but also flow on demand upon heating. More generally, family Covalent Adaptable Networks (CANs) is gleaming with astounding potential, thanks huge variety chemistries that may enable bond exchange. Arising from this signature feature, intriguing properties such as self-healing, recyclability weldability expand horizons thermosets terms improved life-span, sustainability overall enhanced functionality versatility. In review, we present comprehensive overview most promising studies featuring CANs vitrimers specifically, particular regard industrial applications. Investigations into composites sustainable epoxy-based elastomeric networks covered detail.

Язык: Английский

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Network Design to Control Polyimine Vitrimer Properties: Physical Versus Chemical Approach

Macromolecules, Год журнала: 2020, Номер 53(10), С. 3796 - 3805

Опубликована: Май 13, 2020

A family of biobased polyimine elastomeric vitrimers was synthesized by reactions between di- and trifunctional polyetheramines a furan-based dialdehyde. By varying the triamine to diamine ratio molar mass diamine, set cross-linked networks with similar chemical structures but different cross-link densities obtained. All these materials exhibit vitrimeric behavior because dynamic nature imine bonds. This fundamental study clearly reveals that density has drastic effect on relaxation properties vitrimers. For instance, times activation energies reduced when vitrimer decreased. shows can be controlled sole modification network physical without introduction catalyst, change in structure, or additional groups. In addition, fast dual process been evidenced during stress experiments, which could potentially lead double modes based supramolecular interactions. The selective solubility also demonstrated, opening interesting possibilities for recycling while still offering robustness against aggressive conditions such as highly basic solutions. Finally, high thermal stability designed provide an reprocessability tunable mechanical properties, showing versatility this sustainable materials.

Язык: Английский

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Neighboring Group Participation and Internal Catalysis Effects on Exchangeable Covalent Bonds: Application to the Thriving Field of Vitrimer Chemistry

Macromolecules, Год журнала: 2021, Номер 54(9), С. 3927 - 3961

Опубликована: Апрель 19, 2021

Vitrimers constitute a fascinating class of polymer materials that make the link between historically opposed 3D networks (thermosets) and linear polymers (thermoplastics). Their chemical resistance, reshaping ability, unique rheological behavior upon heating them promising for future applications in industry. However, many vitrimers require use high catalyst loadings, which raises concerns their durability limits potential applications. To cope with this issue, internal catalysis neighboring group participation (NGP) can be used to enhance ability such materials. A few studies report effect activating groups on exchange reactions vitrimers. Nevertheless, knowledge topic remains scarce, although research would greatly benefit from NGP already known organic chemistry. The present Perspective presents different types exchangeable bonds implemented discusses have or potentially capable an enhancing reactions. This analysis is underpinned by thorough mechanistic discussion various presented.

Язык: Английский

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