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

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(40)

Published: June 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.

Language: Английский

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Mechanically Robust Polyurethane Vitrimers with B–N-Coordinated Boronic Ester Bonds

ACS Applied Polymer Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 10, 2025

Language: Английский

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Non-isocyanate Polythiourethane Network from Biowaste: Achieving Circularity via Multidimensional Chemical Recycling with Valuable Small-Molecule Recovery and Reprocessability by Understanding the Dynamic Chemistry

Macromolecules, Journal Year: 2023, Volume and Issue: 57(2), P. 490 - 502

Published: Dec. 29, 2023

We studied and established the dual nature of non-isocyanate polythiourethane (NIPTU) dynamic chemistry capitalized on our understanding to achieve multidimensional chemical recycling a cross-linked NIPTU, also known as poly(mercapto-thiourethane). This NIPTU includes first demonstration recovery valuable small molecules in addition reprocessability with full cross-link density recovery. In particular, we performed investigation using small-molecule analogues. identified two types chemistry: reversible cyclic thiocarbonate aminolysis, where thiourethane (NITU) groups reversibly dissociate into thiocarbonates amines, trans(thio)carbamoylation, thionourethane linkages within NITU undergo exchange reactions alcohol. synthesized renewable glycerol-based (GNIPTU) high biowaste-derivable content. Capitalizing recovered pure di(thiocarbamate) 94 mol % yield, one highest yields among reported studies polymers. The GNIPTU network exhibited property after reprocessing, providing another effective method recycling. With robust properties, content, capability excellent recovery, reprocessability, exemplifies how low-cost, renewable, polyurethane-like materials can be developed both high-performance characteristics potential contribute meaningfully polymer circularity.

Language: Английский

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Thiol‐X Chemistry: A Skeleton Key Unlocking Advanced Polymers in Additive Manufacturing

Macromolecular Materials and Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: March 5, 2025

Abstract Using additive manufacturing (AM) technologies for the fabrication of advanced polymeric objects is a logical progression to realize their potential within engineering applications that demand complex geometries. Thiol‐X chemistry has presented itself as diverse and invaluable toolkit accomplish such, satisfying both processing requirements properties desired fabricate range using variety AM technologies. The “click” nature many thiol‐X reactions, mechanisms polymerization, functional group tolerance orthogonality, desirable achievable with presents synergistic opportunity few other chemistries can broadly facilitate. As result, use gained rapid traction in recent years it now case are being viewed two sides same coin, whereby scope limitations whole system appreciated. This review highlights advancements, status, scope, opportunities achieve polymers by critically examining structure‐property‐processing‐performance relationships between different various

Language: Английский

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Sulfur‐Rich Polymers Coatings

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(44)

Published: May 20, 2024

Abstract Advancements in the synthesis of sulfur‐rich materials are driving progress across diverse fields owing to rich and tunable functionalities those materials. These typically valued for their electrochemical behaviors, high refractive indices, heavy metal affinity, ability form dynamic covalent bonding. As a result, applications span various industries including electronics, catalysis, lithium‐sulfur batteries, water reclamation, optoelectronics. Moreover, elemental sulfur, byproduct petroleum industry, is produced abundantly, necessitating exploration novel valorization routes polymers made from this feedstock. The unique combination properties also makes them an ideal platform development high‐performance functional coatings, offering durability tailored protective thus enhancing lifespan performances variety environmental conditions. presence bonds many enables creation self‐healing while sulfur itself or comonomers can contribute antimicrobial, antifouling, corrosion‐resistant properties. Furthermore, have potential be used design icephobic superhydrophobic coatings. This underscores versatility as advanced coatings with superior

Language: Английский

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Chemistry of Polythiols and Their Industrial Applications

Materials, Journal Year: 2024, Volume and Issue: 17(6), P. 1343 - 1343

Published: March 14, 2024

Thiols can react with readily available organic substrates under benign conditions, making them suitable for use in chemical, biological, physical, and materials engineering research areas. In particular, the highly efficient thiol-based click reaction includes of radicals electron-rich enes, Michael addition electron-poor carbonyl isocyanate SN2 ring opening epoxies, nucleophilic substitution halogens. This mini review provides insights into emerging venues their industrial applications, especially applications thiol-ene, thiol–isocyanate, thiol–epoxy reactions, highlighting a brief chemistry thiols as well various approaches to polythiol synthesis.

Language: Английский

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A mechanochemical approach to recycle thermosets containing carbonate and thiourethane linkages

Polymer, Journal Year: 2024, Volume and Issue: 298, P. 126877 - 126877

Published: March 6, 2024

Over the past decades, various industries shifted from traditional materials such as glass and metals to thermoset polymers due their excellent chemical resistance, thermal stability, reduced weight, affordability. However, at end of life cycle, these highly crosslinked up environmental pollutants non-recyclability. To tackle this issue, researchers are exploring vitrimer-type with recyclable qualities, supporting a circular economy sustainable management wastes. This study investigates new promising method recycling two commonly used thermosets in commercial applications, poly allyl diglycol carbonate (PADC) thiourethane (PTU), via mechanochemical process known vitrimerization. The involves cryogenic ball milling zinc-based catalyst hydroxyl-providing agent, followed by compression molding, enabling conversion into vitrimer. Rheological tests revealed remarkable stress-relaxation capabilities vitrimerized networks, indicating initial permanent structures dynamic networks through Dynamic mechanical analysis results show that samples display consistent rubbery plateau high temperature, similar permanently suggesting fix crosslink density during exchange reaction. Differential scanning calorimetry thermogravimetric showed properties closely resemble those original samples.

Language: Английский

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Revealing Dynamic Behavior in High Dielectric Poly(thiourethane)-Based Vitrimer-like Materials

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: 6(9), P. 5473 - 5484

Published: April 27, 2024

Here, we have explored covalent adaptable networks (CANs) comprising poly(thiourethane)-based systems (PTUs). The PTUs were synthesized through the combination of thiol and isocyanate monomers in stoichiometric proportions, presence dibutyltin dilaurate (DBTDL) as catalyst. Dynamic mechanical analysis (DMA) provided detailed insight into vitrimeric behavior. Through these investigations, evaluated viscoelastic, thermomechanical, properties. Additionally, broadband dielectric spectroscopy (BDS) revealed various relaxation processes inherent such vitrimer-like materials. We methodically examined evolution each every prepared sample to comprehend operational mechanisms systems. Our findings underscore that depending on PTU formulation, glass transition temperature (Tg) topology freezing (Tv) can be effectively distinguished studied. Considering high dipole moment dynamic bonds present systems, there is potential for utilizing them materials working under concept dipolar polymers. Furthermore, reversibility exhibited by their inner chemical structures positions promising candidates active layers capacitor devices, particularly energy-related applications, with ability recyclable while maintaining almost invariant both properties, thus promoting extension lifespan electronic devices.

Language: Английский

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Ionic-Bond Regulated Cross-Linking Polyurethane with Multilevel Energy Dissipation, Enhanced Chain Rearrangement and Solvent Reprocessability

ACS Materials Letters, Journal Year: 2025, Volume and Issue: unknown, P. 1984 - 1992

Published: April 21, 2025

Language: Английский

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Effect of Rosin Structure Position in Chain Segment on Properties of Self-Healing Polyurethane

ACS Applied Polymer Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 22, 2025

Language: Английский

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