Reprocessable, Bio-Based, Self-Blowing Non-Isocyanate Polyurethane Network Foams from Cashew Nutshell Liquid

ACS Applied Polymer Materials, Год журнала: 2023, Номер 5(8), С. 6651 - 6661

Опубликована: Июль 10, 2023

Growing environmental concerns and the goal of a circular economy for polymers necessitate development biowaste-based materials efficient recycling polymer materials. Here, we developed series self-blowing network polyhydroxyurethane (PHU) foams by leveraging aminolysis decarboxylation cashew nutshell liquid (CNSL)-based cyclic carbonate with thiols to release CO2 as blowing agent; these contain up 80 wt % bio-based content. By systematically varying agent concentrations, demonstrated tunability morphologies mechanical properties CNSL-based PHU foams. Using dynamic analysis (DMA), compression testing, hysteresis showed that fall into category flexible potential memory or resiliency To address recyclability challenges thermoset foams, repurposed bulk reprocessed them exploiting chemistries hydroxyurethane linkages. Notably, networks exhibited full property retention. Moreover, systematic inclusion permanent linkages substitute cross-links presents an avenue study interplay cross-link density toward characteristics. We average relaxation times activation energies increase increasing levels in system, demonstrating highly tunable behaviors

Язык: Английский

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Foam-to-Elastomer Recycling of Polyurethane Materials through Incorporation of Dynamic Covalent TAD–Indole Linkages

ACS Applied Polymer Materials, Год журнала: 2024, Номер 6(5), С. 2604 - 2615

Опубликована: Фев. 19, 2024

Polyurethane (PU) foams are a large volume commodity product and as such pose considerable recycling challenge for the polymer manufacturing industry. The incorporation of dynamic covalent bonds within PU network chemistry is possible strategy to improve sustainable development foams. Herein, we report outcome research program aimed at thermoreversible triazolinedione (TAD)-indole linkages an industrial standard foam formulation. A scalable synthesis required TAD–indole building blocks was developed, aiming maximizing their physicochemical compatibility with polyol isocyanate ingredients. pilot scale TAD-based cross-linker affording more than 50 kg IPDI-derived bis-urazole block. Propoxylation indole fragments proved be key technology enabling kilogram production based polyols. innovative polyols were successfully used produce range flexible elastomers in solvent-free Owing nature linkers, could processed into through thermal compression molding, which further recycled up 7 times same manner. We studied effect compositions on foaming process efficiency. mechanical properties materials have been analysis, tensile measurements, rheology. This work demonstrates that viable polyurethane but also points out some critical aspects obstacles related design

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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Catalyst-free Construction of Biomass-based Robust and Flame-retardant Polyurethane Foams

Polymer Degradation and Stability, Год журнала: 2024, Номер 225, С. 110805 - 110805

Опубликована: Май 3, 2024

Язык: Английский

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Dissociation role on the catalytic activity of organic halides in CO2 conversion to cyclic carbonates: Experimental and computational study

Journal of CO2 Utilization, Год журнала: 2024, Номер 88, С. 102929 - 102929

Опубликована: Сен. 12, 2024

Язык: Английский

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Reactive bio-based flame retardant derived from chitosan, phytic acid, and epoxidized soybean oil for high-performance biodegradable foam

International Journal of Biological Macromolecules, Год журнала: 2025, Номер 307, С. 142137 - 142137

Опубликована: Март 14, 2025

Язык: Английский

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Vat photopolymerization of stretchable foam with highly entangled and crosslinked structures

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Май 22, 2025

Vat photopolymerization 3D printed flexible polymer foams, characterized by their porosity and lightweight nature, are in high demand for applications thermal insulation, sound absorption, noise reduction, biomedicine. The vat used UV-curable resin composed of oligomer can provide excellent fabrication accuracy, however the cross-linking density after curing prevents green part from expanding further being processed into foam parts. In this work, a facile additive manufacturing polyurethane preparation method that successfully balances accuracy expansion ratio is presented. containing difunctional dynamic polyurea bonds system ensures printing accuracy. Additionally, urea disassociate under heating condition, reducing providing free space expansion. Moreover, heat stimulated chain extension crosslinking enhance stretchability demonstrating strain up to 650% at 0.25 g/cm3. This work addresses challenge associated with fabricating foaming parts via delivering favourable surface quality without compromising mechanical properties.

Язык: Английский

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Self-healing polyurethane composite films loaded with Ni@C nanoparticles

European Polymer Journal, Год журнала: 2023, Номер 199, С. 112479 - 112479

Опубликована: Окт. 6, 2023

Язык: Английский

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Crosslinked poly(hydroxyurethane) films from biobased carbonates: Structure-properties relationships and the influence of moisture in the mechanical properties

Progress in Organic Coatings, Год журнала: 2023, Номер 187, С. 108100 - 108100

Опубликована: Ноя. 23, 2023

In this work, crosslinked poly(hydroxyurethane) (PHU) films were prepared by the reaction of biobased cyclic carbonates (BisCC), with different chain lengths, hyperbranched poly(ethyleneimine) (PEI) under amenable conditions and in absence catalysts. Fourier transform infrared (FTIR) spectroscopy revealed that carbonate groups completely consumed crosslinking gel content was about 99 %. It shown thermal mechanical properties PHU depended on length carbon BisCC. presence moist environment, absorbed moisture (6–8 %) which is ascribed to hydroxyl groups. This resulted a deterioration properties, not recovered after drying. To counteract effect, simple procedure used surface modified stearate Although FTIR water contact angle measurements demonstrated became more hydrophobic modification, absorption capacity similar unmodified films. suggests modification process may cause some degradation bulk material opens spaces for molecules penetration. summary, work has shed light first time effects pure modifications are sufficient prevent absorption.

Язык: Английский

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Synthesis of non‐isocyanate polyurethanes with high‐performance and self‐healing properties

Journal of Applied Polymer Science, Год журнала: 2023, Номер 141(5)

Опубликована: Ноя. 9, 2023

Abstract Due to the utilization of potentially hazardous monomer, isocyanate compound, polyurethanes (PUs) with good properties are restricted in several fields, such as bio‐engineering. Non‐isocyanate (NIPUs) high overall performance and self‐healing were synthesized by dicarbamate, bio‐based isosorbide (IS) polycarbonate diols (PCDLs) through a solvent‐free ecologically friendly melt polycondensation route. Previously, few monomers have been introduced into reactions PUs. Chemical structures NIPUs analyzed Fourier transform‐infrared spectroscopy (FT‐IR), proton nuclear magnetic resonance ( 1 H NMR) gel permeation chromatography (GPC). With changing IS content molecular weight PCDL, obtained had linear weights ranging from 3.3 × 10 4 5.9 g/mol. Results tensile testing, differential scanning calorimetry (DSC) thermogravimetric analysis (TGA) suggested well thermal mechanical properties, T d,5% above 286.2°C strength between 8.0 16.7 MPa due crystallization hydrogen bonding interactions. Furthermore, exhibited ability recyclability, having great potential for industrialization.

Язык: Английский

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