Fully biomass-derived polyurethane based on dynamic imine with self-healing, rapid degradability, and editable shape memory capabilities

Chemical Engineering Journal, Год журнала: 2023, Номер 479, С. 147823 - 147823

Опубликована: Дек. 3, 2023

Язык: Английский

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Healable and Recyclable Polyurea‐Urethane Elastomer with High Mechanical Robustness, Superhigh Elastic Restorability, and Exceptional Crack Tolerance

Advanced Functional Materials, Год журнала: 2024, Номер 34(22)

Опубликована: Фев. 5, 2024

Abstract Developing the elastomer materials with high mechanical robustness through simple and environmentally friendly methods poses significant challenges. In this research, a solvent‐free polymerization method is reported to synthesize transparent polyurea‐urethane using polycaprolactone (PCL) as soft segment adjusting various hard segments. The target successfully combine acceptable performance exceptional crack tolerance, whereby notched samples can readily lift 25000 times (a rarely value) its weight. Moreover, superhigh elastic restorability allow recover original dimension from elongation over 5 or fracture. These results are attained due presence of densely uniformly distributed microdomains within elastomer, leading effective energy dissipation. Furthermore, owing linear structure molecular chains reversible hydrogen‐bonding interactions between chains, be conveniently healed recycled under heating conditions. This research provide general feasible strategy for construction comprehensive properties, elastomers expected applied in emerging fields such protective elements flexible electronics.

Язык: Английский

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Ultrastrong and Thermo‐Remoldable Lignin‐Based Polyurethane Foam Insulation with Active‐Passive Fire Resistance

Advanced Functional Materials, Год журнала: 2024, Номер 34(40)

Опубликована: Июнь 19, 2024

Abstract Foam thermal insulators are indispensable for prevailing energy‐saving engineering, however their widespread use brings intractability such as unsustainability, “white pollution”, and fire hazards. The emergence of bio‐based foams is highly appreciated, but the fabrication approaches economically unattractive and/or product properties inferior, making large‐scale implementation unviable. Herein, a versatile, thermally remoldable phosphate‐containing polyurethane composite foam (LPU‐G) constructed from natural lignin expanded graphite flakes via an atmospheric pressure scalable one‐pot strategy. optimal LPU‐G exhibits exceptional mechanical strength, capable supporting over 6000 times its weight without significant deformation. Moreover, demonstrates desired multifunctionality in handling extreme circumstances, including humidity‐tolerant insulation, superb water vapor barrier, withstanding ≈1200 °C flame ignition. Based on “expansion‐conductivity” micro‐mechanism, first material to be sensitive alarm system with ultra‐long time (>1800 s). Surprisingly, can rapidly upcycled into recyclable bulk composites second life through simple thermo‐molding processes rooted multi‐dynamic behavior phosphate, carbamate, hydrogen bonds. easy‐to‐scale represents new generation that address concerns regarding high cost, risk, inferior properties.

Язык: Английский

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Smart healable polyurethanes: sustainable problem solvers based on constitutional dynamic chemistry

Materials Chemistry Frontiers, Год журнала: 2023, Номер 7(17), С. 3494 - 3523

Опубликована: Янв. 1, 2023

This review article summarizes the recent progress of self-healing/healable polyurethanes and their composites mainly focuses on multiple construction methods.

Язык: Английский

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Sustainable polymers from renewable resources through click and multicomponent reactions

European Polymer Journal, Год журнала: 2024, Номер 209, С. 112897 - 112897

Опубликована: Март 6, 2024

Язык: Английский

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Health Benefits, Applications, and Analytical Methods of Freshly Produced Allyl Isothiocyanate

Foods, Год журнала: 2025, Номер 14(4), С. 579 - 579

Опубликована: Фев. 10, 2025

Allyl isothiocyanate (AITC) is a low-molecular-weight natural chemical predominantly obtained from the autolysis of sinigrin, glucosinolate found in cruciferous vegetables like mustard, horseradish, and wasabi. AITC has sparked widespread interest due to its various biological actions, which include strong antioxidant, anti-inflammatory, antibacterial, anticancer capabilities. This compound offers promising potential several fields, particularly food preservation, medicine, enhancing quality through means. AITC's effectiveness against broad spectrum microorganisms, including foodborne pathogens spoilage agents, makes it an attractive alternative synthetic preservatives. The extend shelf life perishable foods important tool for production, meeting rising customer demand additives. In addition antimicrobial effects, demonstrates significant anti-inflammatory activity, reducing levels pro-inflammatory cytokines modulating key signaling pathways, could make valuable managing chronic inflammatory conditions. Furthermore, emerging research highlights cancer prevention treatment, as been demonstrated induce apoptosis inhibit cell increase lines, offering approach chemoprevention. review delves into structure, metabolism, bioavailability freshly produced AITC, providing comprehensive overview beneficial properties. Challenges related volatility, dosage optimization, regulatory considerations are also discussed, alongside future directions enhance stability efficacy AITC-based formulations. findings underscore role versatile bioactive with known support human health sustainable industry.

Язык: Английский

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Development of a DOPO-based flame retardant with pendant chains for enhanced polyurethane elastomers

Polymer Degradation and Stability, Год журнала: 2025, Номер unknown, С. 111302 - 111302

Опубликована: Март 1, 2025

Язык: Английский

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The Influence of Soft Segment Structure on the Properties of Polyurethanes

Polymers, Год журнала: 2023, Номер 15(18), С. 3755 - 3755

Опубликована: Сен. 14, 2023

A series of polyurethanes (PU) were synthesised via one-step polymerisation without a chain extender, using toluene diisocyanate as well variety soft segments composed different macrodiols. Poly(D,L-lactide) (PDLLA) and polycaprolactone diol (PCL) polyester type polyols to obtain segments. The process varying the molar ratio newly PDLLA in has been confirmed powerful tool for fine-tuning final properties PU. Fourier-transformed infrared spectroscopy was used evaluation molecular structures polyol Nuclear magnetic resonance spectrometry confirm presumed structure influence segment composition on polyurethane thermal characteristics examined thermogravimetric analysis differential scanning calorimetry. had little impact stability PU materials, which is explained by comparable both polyols. Wide-angle X-ray scattering utilised evaluate effect amorphous degree crystallinity PCL It discovered that not only did have substantial microphase separation hard segments, but it also influenced crystallisation behaviour materials. Furthermore, restriction verified be dependent concentration PDLLA/PCL sample with pure component achieved highest (34.8%). results demonstrated directly affected obtained films. These can easily achieve desirable set required application biomaterials.

Язык: Английский

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Vanillin-Based Degradable Polyurethane Thermosets Demonstrating High Bio-Content and Mechanical Properties

ACS Applied Polymer Materials, Год журнала: 2023, Номер 5(6), С. 4536 - 4545

Опубликована: Май 24, 2023

Polyurethanes are widely used polymeric materials, but they rarely biorenewable and degradable. Although some previously reported bio-based polyurethanes exhibit good thermal mechanical properties, their bio-content is usually low, resulting from the only replacement of diol monomer instead whole diol/diisocyanate pairs. In addition, traditional often difficult to degrade, leading environmental issues. To address these issues, we propose a solution by sourcing both diols isocyanates resources introducing degradability into via Tishchenko reaction, which disproportionation two aldehydes afford an ester bond with atom economy 100%. Commercially available vanillin was selected as precursor for vanillin-based (VBD) containing bonds. By reacting VBD l-lysine diisocyanate (LDI) trimethylolpropane (TMP) crosslinker, series thermosetting polyurethanes, VBD-TMPx, high carbon content (>70.0%) were synthesized. The chemical structures properties monomers well polymers characterized using nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), dynamic (DMA), tensile tests. obtained VBD-TMPx comparable (σ = 32.0 MPa; E′ 2.7 GPa) commercial demonstrate higher toughness (34 MJ/m3) than analogues. Additionally, inherent in enables complete degradation 0.1 M NaOH (THF/H2O 1:1, v/v) within 3.5 h. This greatly broadens end-of-life choices, including recovery monomers. study presents facile approach creating degradable polyurethane materials properties.

Язык: Английский

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Metal-Free Synthesis of Biodegradable CO₂-Based Oligo(carbonate-ester) Diols as Building Blocks for Thermoplastic Polyurethanes

ACS Applied Polymer Materials, Год журнала: 2024, Номер 6(3), С. 1813 - 1822

Опубликована: Янв. 29, 2024

We for the first time synthesize a type of biodegradable CO2-based oligo(carbonate-ester) diol (PPCPDL) with aromatic ester units via one-pot immortal copolymerization using carbon dioxide (CO2)/propylene oxide (PO)/phthalic anhydride (PA) as raw materials and 1, 4-butanediol (BDO) proton exchange agent (PEA), respectively, catalyzed by metal-free triethylborane/triethylamine (TEB/TEA) Lewis pairs. A series PPCPDLs molar mass (Mn) ranging from 1100 to 7100 Da polyester content (PE mol %) between 0 36% were constructed tuning reaction temperature, CO2 pressure, time, feeding ratio. Our strategy adopts PA third monomer incorporate PE blocks into PPCPDLs, affording resulting thermoplastic polyurethanes (TPUs) improved thermal/mechanical properties. TPU-PPCPDL aliphatic carbonate- polyester-units can deliver highest tensile strength 35.2 MPa hardness 97 (Shore A), superior commercial diols-based TPUs. Twenty wt % propylene glycol (PPG) was also introduced second soft segment TPU-PPCPDLs endow obtained TPUs various physical properties, including good thermal stability, light transmittance, mechanical behaviors, which indirectly highlights application value significance such building in TPU production.

Язык: Английский

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