Reversible Photochromism for Dynamically Tuning Full‐Color Circularly Polarized Luminescence Toward Multi‐Level Anti‐Counterfeiting Application

Advanced Optical Materials, Год журнала: 2024, Номер 12(19)

Опубликована: Апрель 9, 2024

Abstract Photochromic circularly polarized luminescence (CPL) demonstrates broad application prospects in the field of advanced functional materials. However, current photochromic CPL focuses predominantly on single‐band adjustment, and how to achieve dynamically tunable multi‐band is still highly challenging. This work reports success utilizing reversible photochromism for realizing full‐color emission. flexible films are created consisting triple components: spiropyran (SP) working as matter, polyurethane (PU) matrix, chiral helical polyacetylene component. Further introducing blue fluorophore 9‐anthracene carboxylic acid (ACA) film, red emitted respectively through selective absorption/transmission fluorescence energy transfer (CPF‐ET). Doping film with diverse fluorophores provides Adding Zn 2+ further intensifies via forming merocyanine (MC)‐Zn complex. Taking advantage emission, anti‐counterfeiting, secondary encryption resulting materials demonstrated.

Язык: Английский

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Toward Circular Recycling of Polyurethanes: Depolymerization and Recovery of Isocyanates

JACS Au, Год журнала: 2024, Номер 4(4), С. 1471 - 1479

Опубликована: Апрель 11, 2024

We report a depolymerization strategy to nearly quantitatively regenerate isocyanates from thermoplastic and thermoset polyurethanes (PUs) then resynthesize PUs using the recovered isocyanates. To date, chemical/advanced recycling of has focused primarily on recovery polyols diamines under comparatively harsh conditions (e.g., high pressure temperature), been difficult. Our approach leverages an organoboron Lewis acid depolymerize directly mild ∼80 °C in toluene) without need for phosgene or other reagents, we show that both laboratory-synthesized commercially sourced can be depolymerized. Furthermore, demonstrate utility isocyanate production second-generation with thermal properties molecular weights similar those virgin PUs. Overall, this route uniquely provides opportunity circularity PU materials add significant value end-of-life products.

Язык: Английский

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Realization of customizable performance castor oil-based waterborne polyurethane antiseptic coatings via arbutin

Industrial Crops and Products, Год журнала: 2024, Номер 212, С. 118315 - 118315

Опубликована: Март 5, 2024

Язык: Английский

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Biomass to green surfactants: Microwave-assisted transglycosylation of wheat bran for alkyl glycosides production

Bioresource Technology, Год журнала: 2024, Номер 401, С. 130738 - 130738

Опубликована: Апрель 25, 2024

Язык: Английский

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Optimization of Microwave-Assisted Polycondensation for Flexible Biodegradable Polyurethane in Sustainable Packaging Applications

Materials Today Communications, Год журнала: 2025, Номер unknown, С. 111878 - 111878

Опубликована: Фев. 1, 2025

Язык: Английский

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Aromatic thermoplastic polyurethanes synthesized from different potential sustainable resources

European Polymer Journal, Год журнала: 2023, Номер 197, С. 112338 - 112338

Опубликована: Июль 30, 2023

Thermoplastic polyurethanes (TPUs) are known for their versatility due to the wide range of macromolecular architectures available. This study focuses on synthesis and architecture-properties relationships new sustainable aromatic TPUs, derived from different potential resources, such as biomass plastic waste. Thus, short diols were synthesized 4–hydroxybenzoic acid syringic acid, named HB.diol Syr.diol, respectively. Subsequently, TPUs prepared with these original chain extenders, alongside conventional aliphatic like 1,4–benzenedimethanol (BDM) 1,4-butanediol. The investigation explored effect extender structures properties resulting using both diisocyanates in synthesis. thermal mechanical characteristics evaluated identify key structural parameters that influence architectures. Notably, presence rings enhanced incompatibility between soft hard segments (HS), greater phase segregation. Ether bonds symmetric BDM hydrogen bonding, promoting development organized crystalline HS, enhancing segregation, thus improving thermo–mechanical properties. On opposite, methoxy groups Syr.diol asymmetry diisocyanate hindered organization leading reduced structuration lower Overall, findings highlight creating TPU desirable by selecting appropriate raw materials.

Язык: Английский

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Foam‐to‐Foam Recycling Potential of PU‐Foams by Integration of Amino Esters

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 27, 2024

Abstract The increasing market demand for flexible polyurethane foams (PUFs) is prompting the academic and industrial community to seek solutions their end‐of‐life management. In this study, issue addressed by incorporating β‐amino ester (BAE) moieties into foam structure. This addition results in hybrid PU‐BAE that can be thermally reprocessed chemically recycled, with cell sizes ranging from 780 990 µm densities between 90 150 kg m −3 . These demonstrate thermomechanical reprocessability, yielding stable elastomers, glass transition temperature values 14 25 °C. Stress relaxation experiments reveal remarkably fast times these elastomers (23 s at 160 °C). Furthermore, a systematic investigation of chemical recyclability via glycosylation conducted under mild conditions, achieving complete disintegration within 20 min 65 Finally, recycled product converted again, closed loop foam‐to‐foam recycling process. findings indicate integration BAE PUFs leads an enhanced rate, providing promising avenue addressing concerns PUF‐applications.

Язык: Английский

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Producing polyglycerol polyester polyol for thermoplastic polyurethane application: A novel valorization of glycerol, a by-product of biodiesel production

Heliyon, Год журнала: 2023, Номер 9(9), С. e19491 - e19491

Опубликована: Авг. 25, 2023

The production of biodiesel generates glycerol as a by-product that needs valorization. Glycerol, when converted to polyglycerol, is potential polyol for bio-based thermoplastic polyurethane (TPU) production. In this study, novel polyglycerol polyester (PPP) was developed from refined and coconut oil-based polyol. Glycerol first acetate then polymerized with (CPP) secondary phthalic anhydride. resulting PPP at 220 °C OH:COOH molar ratio 2.5 exhibited an OH number <100 mg KOH·g sample

Язык: Английский

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Innovations in applications and prospects of non‐isocyanate polyurethane bioplastics

Biopolymers, Год журнала: 2023, Номер 114(12)

Опубликована: Окт. 17, 2023

Abstract Currently, conventional plastics are necessary for a variety of aspects modern daily life, including applications in the fields healthcare, technology, and construction. However, they could also contain potentially hazardous compounds like isocyanates, whose degradation has negative impact on both environment human health. Therefore, researchers exploring alternatives to plastic which is sustainable environmentally friendly without compromising its mechanical physical features. This review study highlights production highly eco‐friendly bioplastic as an efficient alternative non‐biodegradable plastic. Bioplastics produced from various renewable biomass sources such plant debris, fatty acids, oils. Poly‐addition di‐isocyanates polyols technique employed over decades produce polyurethanes (PUs) bioplastics feedstock. The toxicity isocyanates major concern with above‐mentioned approach. Novel green synthetic approaches using have been attracting greater interest recent years overcome isocyanate‐containing raw materials. polyaddition cyclic carbonates (CCs) polyfunctional amines appears be most promising method obtain non‐isocyanate (NIPUs). results creation polymeric materials distinctive adaptable features elimination harmful compounds. Consequently, represent new class In this study, we discussed possibility creating novel NIPUs feedstocks context growing demand ecologically products.

Язык: Английский

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Study on the effect of chain extenders on aliphatic polyurethane and its application

Journal of Applied Polymer Science, Год журнала: 2024, Номер 141(22)

Опубликована: Март 16, 2024

Abstract Thermoplastic polyurethane (TPU) has been applied to high‐performance laminated glass depending on its high impact strength and bonding properties. The utilization of various molecular structures in is scarcely reported. selection application chain extenders are crucial for TPU performance. In this work, aliphatic film with successfully synthesized, incorporating extender poly(propylene glycol) bis(2‐aminopropyl ether) (PEA230). films melting point above 80°C were prepared by adjusting the proportion dimethylglyoxime (DMG), while simultaneously monitoring thermal behavior samples DMA. Results indicate that combining PEA230 DMG a 1:1 molar ratio yields hydrogen degree 85.77%, toughness 43.14 MJ m 3 , shear stress 1.8 MPa film. Subsequently, glasses based different properties constructed successfully, their super strong resistance was confirmed through falling ball experiments.

Язык: Английский

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