Phosphorus-free hyperbranched polyborate flame retardant: Ultra-high strength and toughness, reduced fire hazards and unexpected transparency for epoxy resin

Composites Part B Engineering, Journal Year: 2022, Volume and Issue: 242, P. 110101 - 110101

Published: July 4, 2022

Language: Английский

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Hyperbranched Polyborosiloxanes: Non‐traditional Luminescent Polymers with Red Delayed Fluorescence

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(48)

Published: Sept. 27, 2023

Non-traditional fluorescent polymers have attracted significant attention for their excellent biocompatibility and diverse applications. However, designing preparing non-traditional that simultaneously possess long emission wavelengths fluorescence lifetime remains challenging. In this study, a series of novel hyperbranched polyborosiloxanes (P1-P4) were synthesized. As the electron density increases on monomer diol, optimal P1-P4 gradually red-shift to 510, 570, 575, 640 nm, respectively. particular, P4 not only exhibits red but also demonstrates delayed with 9.73 μs lowest critical cluster concentration (1.76 mg/mL). The experimental results theoretical calculations revealed synergistic effect dual heteroatom-induced delocalization through-space O⋅⋅⋅O O⋅⋅⋅N interaction was key factor contributing red-light fluorescence. Additionally, these showed potential in dual-information encryption. This study provides universal design strategy development unconventional both long-wavelength emission.

Language: Английский

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Effects of nonaromatic through‐bond conjugation and through‐space conjugation on the photoluminescence of nontraditional luminogens

Aggregate, Journal Year: 2024, Volume and Issue: 5(3)

Published: Feb. 8, 2024

Abstract Photoluminescence (PL) mechanisms of nontraditional luminogens (NTLs) have attracted great interest, and they are generally explained with intra/intermolecular through‐space conjugation (TSC) nonconventional chromophores. Here a new concept nonaromatic through‐bond (TBC) is proposed it proved that plays an important role in the PL NTLs. The behaviors three respective isomers cyclohexanedione gemdimethyl‐1,3‐cyclohexanedione were studied correlated their chemical aggregate structures. These compounds show different fluorescence emissions as well concentration, excitation solvent‐dependent emissions. which undergo keto‐enol tautomerism hence conjugated ketone‐enol structure (i.e., TBC) more red‐shifted TBC effect reduces energy gaps facilitates formation stronger TSC state. form also prone to occur excited state proton transfer (ESIPT). cooperative determines This work provides novel understanding NTLs importance for directing design synthesis

Language: Английский

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Engineering Tunable Ratiometric Dual Emission in Single Emitter‐based Amorphous Systems

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(10)

Published: Jan. 8, 2024

Molecular emitters with multi-emissive properties are in high demand numerous fields, while these basically depend on specific molecular conformation and packing. For amorphous systems, special arrangement is unnecessary, but it remains challenging to achieve such luminescent behaviors. Herein, we present a general strategy that takes advantage of rigidity S

Language: Английский

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Boosting Theranostic Performance of AIEgens Using Nanocatalyzer for Robust Cancer Immunotherapy

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(23)

Published: Feb. 15, 2024

Abstract High‐performance theranostic systems are of paramount importance for achieving precise image‐guided cancer immunotherapy. Here, a novel nanoplatform is presented that integrates aggregation‐induced emission luminogen (AIEgen) with prussian blue (PB) nanocatalyzer robust The AIEgen dimethylamine substitution demonstrates compelling near‐infrared (NIR) light‐induced photothermal conversion and photodynamic therapy (PDT) capabilities. By incorporating into porous PBNPs, further enveloped within M1 macrophage membrane, tumor‐specific nanoagent constructed. This strategic integration effectively constrains the molecular motion AIEgen, leading to amplified NIR‐II fluorescence brightness PDT attributes. Moreover, PBNPs can catalyze tumor‐overexpressed H 2 O generate oxygen boost efficacy, PB's NIR absorption also intensifies photoacoustic imaging effect. provides comprehensive information photoimmunotherapy in orthotopic breast cancer‐bearing mice. Leveraging its potent immunogenic cell death effect, not only significantly inhibits growth, but generates whole‐cell therapeutic vaccine protect mice from tumor rechallenge. In highly malignant post‐surgery models, enables both accurate identification residual tumors efficient inhibition postoperative recurrence pulmonary metastasis. study will offer valuable insights creating efficacious multifaceted protocols.

Language: Английский

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Nonconventional Luminophores: Emission Mechanism, Regulation, and Applications

Accounts of Chemical Research, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 7, 2025

ConspectusNonconventional luminophores, characterized by the absence of extended (hetero)aromatic building blocks and alternating single-double/triple bonds, are composed primarily electron-rich moieties, such as heteroatoms, double aliphatic amines, carbonyls, hydroxyls, cyano groups, amides, their grouped functionalities. These unique structural features, coupled with intriguing luminescent properties, have garnered significant interest for both fundamental research promising applications, thus enabling widespread exploration. They generally benefit from abundant resources, simple synthesis, outstanding biocompatibility, excellent photostability, empowering potential applications in bioimaging, data storage encryption, anticounterfeiting, bio- chemosensing, etc. However, is preliminary, luminescence mechanisms remain elusive. For diverse systems, proposed conjectures, including tertiary amine oxidation, proton transfer, impurities, hydrogen bonding, peptide bond electron delocalization, lack consistent correlation universality, some being subsequently invalidated. This a unifying framework has hampered development effective guidelines molecular design photoluminescence (PL) regulation. To address these issues, clustering-triggered emission (CTE) mechanism, focusing on electron-molecule-aggregate multilevel structure-activity relationships, been proposed. Specifically, it identifies "clustered chromophores" moieties emissive species. The CTE mechanism not only elucidates behaviors nonconventional luminophores but also guides PL regulation further novel multifunctional materials.This Account begins concise introduction to highlighting significance delocalization (through-space conjugation) within groups. It then delves into insights gained various identifying three core components mechanism: clustering, conformational rigidity resulting clusters. proves be rational universally applicable, encompassing natural products, (macro)biomolecules, synthetic compounds extending singlet fluorescence triplet phosphorescence. By strategically coordinating elements, feasible modulate intra/intermolecular interactions, through-space conjugation, spin-orbit coupling clusters, achieving red/near-infrared (NIR) room-temperature phosphorescence (RTP) systems through internal/chemical (e.g., incorporating additional bridging units heavy atoms) external/physical pressurization, conformation adjustments) methods. Furthermore, we investigate integration emitters other conventional functional groups or substrates realize tunable photophysical properties controlling clustering states. approach leads new materials exhibiting synergistic merits high efficiency, film-forming ability, excitation- time-dependent afterglows, photochromic arising subtle rearrangement crystals. information storage, fibers, bioimaging explored. Finally, concludes forward-looking perspective challenges future luminophores.

Language: Английский

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Hyperbranched Dynamic Crosslinking Networks Enable Degradable, Reconfigurable, and Multifunctional Epoxy Vitrimer

Advanced Science, Journal Year: 2023, Volume and Issue: 11(2)

Published: Nov. 7, 2023

Abstract Degradation and reprocessing of thermoset polymers have long been intractable challenges to meet a sustainable future. Star strategies via dynamic cross‐linking hydrogen bonds and/or covalent can afford reprocessable thermosets, but often at the cost properties or even their functions. Herein, simple strategy coined as hyperbranched crosslinking networks (HDCNs) toward in‐practice engineering petroleum‐based epoxy into degradable, reconfigurable, multifunctional vitrimer is provided. The special characteristics HDCNs involve spatially topological crosslinks for solvent adaption multi‐dynamic linkages reversible behaviors. resulting displays mild room‐temperature degradation dimethylacetamide realize cycling carbon fiber powder from composite. Besides, they supra toughness high flexural modulus, transparency well fire‐retardancy surpassing original thermoset. Notably, it noted in chance‐following that ethanol molecule induce reconstruction network by ester‐exchange, converting stiff elastomeric feature, such material records an ultrahigh modulus (5.45 GPa) −150 °C ultralow‐temperature condition uses. This shaping up be potentially advanced address post‐consumer waste, also provide newly crosslinked mode designs high‐performance polymer.

Language: Английский

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Enhanced mechanical and tribological properties of epoxy composites reinforced by novel hyperbranched polysiloxane functionalized graphene/MXene hybrid

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 466, P. 143086 - 143086

Published: April 23, 2023

Language: Английский

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NIR Clusteroluminescence of Non‐conjugated Phenolic Resins Enabled by Through‐Space Interactions

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(30)

Published: May 30, 2023

Clusteroluminescence (CL) and through-space interactions (TSIs) of non-conjugated molecules have drawn more attention due to their unique photophysical behaviors that are different from largely conjugated luminogens. However, achieving red even near-infrared (NIR) emission such systems is still challenging the intrinsic drawbacks lack theories for structure-property relationships. In this work, six phenolic resins designed synthesized based on two molecule-engineering strategies: increasing number TSIs units introducing electron-donating/-withdrawing groups. All verified as luminogens with CL property (CLgens), first example CLgens NIR (maximum wavelength ≥680 nm) high absolute quantum yield (47 %) reported. Experiments theoretical analysis reveal types, locally excited state charge transfer state, play essential roles in these polymers, which could be manipulated via changing structural conformation electron density or altering transition behaviors. This work not only provides an approach manipulate polymers but also endows commercially available practical value luminescence materials.

Language: Английский

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Facile conversion of water to functional molecules and cross-linked polymeric films with efficient clusteroluminescence

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: May 30, 2023

Abstract Exploring approaches to utilize abundant water synthesize functional molecules and polymers with efficient clusteroluminescence properties is highly significant but has yet be reported. Herein, a chemistry of alkyne developed. The synthesized products are proven as nonaromatic clusteroluminogens that could emit visible light. Their emission colors luminescent efficiency adjusted by manipulating through-space interaction using different starting materials. Besides, the free-standing polymeric films much high photoluminescence quantum yields (up 45.7%) in situ generated via water-involved interfacial polymerization. polymerization-enhanced observed, where red-shifts increases when polymerization time prolonged. film also verified Janus film. It exhibits vapor-triggered reversible mechanical response which applied smart actuator. Thus, this work develops method water, builds clear structure-property relationship clusteroluminogens, provides strategy construct water-based films.

Language: Английский

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