Clusterization-Triggered Emission of Waterborne Polyurethane: The Role of Carboxyl Groups

Macromolecules, Journal Year: 2023, Volume and Issue: 57(1), P. 88 - 97

Published: Dec. 27, 2023

The intrinsic luminescent properties of waterborne polyurethane (WPU) as an industrial-scale nonconjugated polymer and the role side groups in its luminescence remain unclear require further exploration. In this work, a series WPUs with different carboxyl contents were prepared, which exhibit clusterization-triggered emission (CTE) characteristics. group strengthened hydrogen bond, electron overlap between lone pairs π electrons, dipole–dipole n–π* interactions, thereby enhancing intensity. Furthermore, leveraging clusteroluminescence characteristics WPU, various applications have been developed, including explosive Fe3+ detection, damage tracing, stretch fluorescence change. This work not only enhances our understanding mechanism but also provides effective approach for designing operating fluorescent materials.

Language: Английский

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Multifunctional all-biomass-derived hydroplastic thermoset polyimine for 3D multiple information encryption and self-adhesive strain sensors

Cell Reports Physical Science, Journal Year: 2023, Volume and Issue: 4(2), P. 101244 - 101244

Published: Jan. 18, 2023

The development of sustainable and eco-processing thermosets with excellent mechanical properties advanced functionality is important but faces great challenges. Here, we prepare all-biomass-derived thermoset polyimines containing dynamic networks non-covalent aggregates (driven by H bonds π-π stacking) imine bonds. Smart molecular design leads to multifunctionality, such as tunable properties, hydroplasticity, polychromatic photoluminescence, composite reprocessing. Effectively combining these functions provides convenient ways for designing materials applications. We demonstrate the feasibility building a 3D anti-counterfeiting platform, allowing polymorphic data encryption multidimensional decryption, well sensitive stretchable dry self-adhesive strain sensors appropriate conformal contact skin. nitrogen-rich synergistic high-char-forming benzene rings give it an intumescent flame-retardant performance that meets criteria fire safety. results provide insights into bio-based plastics integrated

Language: Английский

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Si, B-containing dynamic covalent bonds enable excellent flame retardancy and reduced fire hazards for cyanate ester resin

Materials Horizons, Journal Year: 2024, Volume and Issue: 11(20), P. 5094 - 5102

Published: Jan. 1, 2024

Cyanate ester (CE) resins are distinguished by excellent dielectric properties in electronic packaging materials but face significant fire risks, with existing strategies often compromising their processability or original properties. Herein, we propose an innovative strategy involving the exchange of dynamic covalent bonds under heat stimuli aimed at forming a continuous and compact char layer to enhance safety CE resin. Using straightforward one-pot method, Si-O B-O were integrated into novel hyperbranched polymer (HPSiB), ensuring good compatibility resin while lowering its peak curing temperature 185 °C for facile processability. The resulting material 6 wt% HPSiB exhibits LOI value 32.8% UL-94 V0 rating, especially low total smoke production 6.7 m

Language: Английский

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High-Efficiency Long-Wavelength Fluorescent Hyperbranched Polysiloxanes: Synthesis, Emission Mechanism, Information Encryption, and Film Preparation

Biomacromolecules, Journal Year: 2022, Volume and Issue: 23(11), P. 4617 - 4628

Published: Oct. 11, 2022

Unconventional fluorescent polymers possess the advantages of excellent biocompatibility, environmental friendliness, and facile structural regulation; however, such usually have low fluorescence intensity quantum yields in long-wavelength range. In this work, three kinds high-efficiency emissive hyperbranched polysiloxanes are obtained by introducing aromatic amino acids. These functionalized high green, yellow, red emission regions. Experimental results density functional theory calculations reveal that comes from enhanced electronic communication among conjugated π bonds, electron-rich atoms, −Si(O)3 other groups. Especially, bonds efficiently enlarge spatial delocalizations, resulting emission. Moreover, prepared show applications information encryption film preparation. This work could serve as a guide to develop unconventional polymers.

Language: Английский

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Rational design strategies for nonconventional luminogens with efficient and tunable emission in dilute solution

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 454, P. 140469 - 140469

Published: Nov. 19, 2022

Language: Английский

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