Injectable Conductive Hydroxylamine Nitrate Ionic Gel Materials Crosslinked by Xanthan Gum for Ultra-Fast Multiple Ignitions Response Via Electrical Stimulation

Published: Jan. 1, 2025

To achieve accurate and adjustable propulsion power, it is essential to utilize propellant materials undergoing repeated ignition combustion cycles. Injectable gel possess superior mechanical properties fluidity, allowing for the regulation of their process through precise control flow rate. Herein, an injectable conductive ion which uses hydroxylamine nitrate ([NH3OH]+[NO3]-, HAN) high-energy salt as matrix lithium perchlorate ( [Li]+[ClO4]-,AP) ammonium ([NH4]+[NO3]-, AN) adjust its conductivity was reported. The components this material exhibit high compatibility, confirmed by XPS FT-IR analysis, uniqueness conversion between liquid solid has established a good supply property. After centrifugation at 5000 r·min-1 15 min, eccentricity only 0.6%, demonstrating excellent stability. Compared with existing materials, delay time in single test reached 700ms under 225V 8ml·min-1. More importantly, can be reduced around 200ms after multiple tests, indicating ultra-fast response phenomenon that rarely occurs most research process, paving way realizing ultrafast application space propulsion.

Language: Английский

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Enhancing polyacrylate covalent adaptable networks through dynamic protection and deprotection strategies for highly reactive functional monomers

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160425 - 160425

Published: Feb. 1, 2025

Language: Английский

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Exploiting Dioxazaborocane Chemistry for Preparing Elastomeric Vitrimers with Enhanced Processability and Mechanical Properties

Chemistry of Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 20, 2025

Language: Английский

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Injectable conductive hydroxylamine nitrate ionic gel materials crosslinked by xanthan gum for ultra-fast multiple ignitions response via electrical stimulation

Energy, Journal Year: 2025, Volume and Issue: unknown, P. 135872 - 135872

Published: March 1, 2025

Language: Английский

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Spatially resolved photoactivation of dynamic exchange reactions in 3D-printed thiol–ene vitrimers

Polymer Chemistry, Journal Year: 2023, Volume and Issue: 14(26), P. 3082 - 3090

Published: Jan. 1, 2023

On-demand photoactivation of dynamic transesterification in cross-linked thiol–ene polymers manufactured by digital light processing 3D printing.

Language: Английский

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Controlling the Relaxation Dynamics of Polymer Networks by Combining Associative and Dissociative Dynamic Covalent Bonds

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 27, 2024

Abstract Dynamic polymer networks offer a promising solution to key challenges in polymers such as recyclability, processability, and damage repair. However, the trade‐off between combining facile fast self‐healing, high creep resistance remains major obstacle implementation. To overcome this, two very distinct dynamic covalent chemistries, Diels–Alder transesterification, is combined single network. The resulting dual an unprecedented set of properties control over relaxation times. system decouples dynamics network from spatial motifs, tuning ratio chemistries enables six orders magnitude. Taking advantage this control, composition rheological behavior optimized drastically improve resolution for extrusion‐based additive manufacturing networks. Additionally, well‐defined separated stress peaks are observed at compositions close 50% each chemistry, accentuating double character system's dynamics. This atypical situation, preparation self‐healing materials with negligible creep, shape‐memory solely leveraging dynamics, instead glass transition temperature or melting point.

Language: Английский

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Dual-vat photopolymerization 3D printing of vitrimers

Additive manufacturing, Journal Year: 2023, Volume and Issue: 79, P. 103930 - 103930

Published: Dec. 20, 2023

Language: Английский

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On‐Demand Activation of Transesterification by Chemical Amplification in Dynamic Thiol‐Ene Photopolymers

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(45)

Published: Sept. 7, 2023

Abstract Chemical amplification is a well‐established concept in photoresist technology, wherein one photochemical event leads to cascade of follow‐up reactions that facilitate controlled change the solubility polymer. Herein, we transfer this dynamic polymer networks liberate both catalyst and functional groups required for bond exchange under UV irradiation. For this, exploit photochemically generated acid catalyse deprotection reaction an acid‐labile tert‐butoxycarbonyl group, which employed mask hydroxy vinyl monomer. At same time, released serves as thermo‐activated transesterifications between deprotected ester moieties. Introduced orthogonally cured (450 nm) thiol‐click photopolymer, approach allows spatio‐temporally activation reactions, crucial light creep resistance versus reflow ability trade‐off networks.

Language: Английский

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Enhancement of epoxy‐cyanate ester blends through staged curing‐induced nanophase separation strategy

Journal of Applied Polymer Science, Journal Year: 2024, Volume and Issue: 141(25)

Published: April 22, 2024

Abstract Epoxy‐cyanate ester blends have attracted significant attention due to their unique synergistic properties and versatility in high‐performance applications. However, achieving precise control over the phase‐separated structures these remains a challenge. In this work, we present strategy for preparation of epoxy‐cyanate with through staged curing‐induced phase separation. By incorporating thermally latent catalyst, 4‐ethyl‐2‐methylimidazole tetraphenylborate, into epoxy‐anhydride‐cyanate system, reactivity differences multiple curing reactions within blend were precisely controlled, thereby inducing formation well‐defined nanophase‐separated structures. The polymer systems prepared exhibit high mechanical heat resistance, primarily interpenetrating networks created by nanodomains induced process. Furthermore, demonstrate outstanding hygrothermal resistance low polarity crosslinked network structure. This work provides new insights regulating microstructure thermosetting expands potential applications materials fields requiring long‐term durability reliability.

Language: Английский

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Design of Reversible Adhesives by Using a Triple Function of Ionic Liquids

Macromolecular Materials and Engineering, Journal Year: 2024, Volume and Issue: 309(9)

Published: May 2, 2024

Abstract Reversible adhesives are crucial for a circular economy of composites as they play key role rework, repair, and recycling adhesively bonded components. Herein, electrically debondable prepared by introducing ionic liquids in dynamic thiol–epoxy networks. The function the liquid networks is threefold it accelerates curing reaction between thiol epoxy monomers, facilitates electrical debonding, catalyzes thermoactivated transesterification reactions, required rebonding at elevated temperature. A library 1,3‐dibutylimidazolium‐based with varying anions synthetized found that 1,3‐dibutyl‐1 H ‐imidazol‐3‐ium dicyanamide (DiButIm─N(CN) 2 ) superior accelerating bond‐exchange reactions hydroxy ester moieties Thus, resin containing 20 wt% DiButIm─N(CN) used to impregnate glass fiber mats yielding adhesive connections aluminum substrates 10.2 MPa pull‐off strength. successfully debonded metal–adhesive interface applying 120 V. samples then rebonded via change networks’ viscoelastic properties ≈80% (8.1 MPa) their original bond strength can be regained. By providing simple strategy synthetize reversible adhesives, this approach paves way toward improved recyclability repairability structures.

Language: Английский

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