High-Toughness and Intrinsically Self-Healing Cross-Linked Polyurea Elastomers with Dynamic Sextuple H-Bonds

Macromolecules, Journal Year: 2024, Volume and Issue: 57(5), P. 2100 - 2109

Published: Feb. 23, 2024

High-performance elastomers that possess a combination of high mechanical toughness and fast healability have garnered extensive interest because their diverse application potential. Inspired by the unique multiple hydrogen bond (H-bond) structure spider silk rapid dynamic exchange hindered urea bonds (HUBs), self-healing polyurea elastomer with ultrahigh was designed incorporating sextuple H-bonds HUBs into polymer chain. Such design affords stretchability (1586%), excellent (45.53 MJ m–3), good efficiency (91.6%), fracture energy (39.68 kJ m–2), recyclability. The performance are attributed to presence reversibly cross-linked noncovalent dynamically covalent HUBs, which been validated stress relaxation tests. Meanwhile, substituting chain extender adipic dihydrazide hexamethylenediamine, possesses comparable but fewer amide bonds, effect on confirmed. More importantly, when conductive layer graphene oxide applied surface resulting elastomer, exhibited potential applications in strain sensors.

Language: Английский

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Sustainability of self-healing polymers: A holistic perspective towards circularity in polymer networks

Progress in Polymer Science, Journal Year: 2024, Volume and Issue: 152, P. 101816 - 101816

Published: March 26, 2024

Permanent polymer networks present an important sustainability challenge. Irreversible covalent crosslinks impart these materials excellent mechanical properties, thermal and chemical resistance, yet also render them difficult to repair recycle. Self-healing mechanisms can extend the lifetime of thermosets elastomers, improving their durability making lifecycle more sustainable. In addition extension, this paper reviews self-healing polymers from a holistic point view. The entire is critically assessed with reference green chemistry principles sustainable development. relation between chemistries aspects each phases are discussed, starting feedstocks, monomer functionalisation synthesis, processing manufacturing as well end-of-life considerations, i.e. recycling or (bio)degradation. review provides toolbox for development thermosets, elastomers composites. It utmost importance consider materials, derived products – by extension any material product. ability often related recyclability should primarily reduce amount new that necessary fulfill societal needs, extending maximizing reprocessing into products. Increasing healing efficiency number cycles improves overall environmental impact relative extended service lifetime. Renewable resources biomass, processes waste streams be first choice create polymers. Finally, biodegradability considered complementary scenario upon accidental loss environment, provided biodegradation does not start under prospected use conditions products, but postponed until contact stimuli in environment.

Language: Английский

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Lobster-Inspired Chitosan-Derived Adhesives with a Biomimetic Design

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(6), P. 7950 - 7960

Published: Feb. 2, 2024

Polysaccharide-based adhesives, especially chitosan (CS)-derived serve as promising sustainable alternatives to traditional adhesives. However, most demonstrate a poor adhesive strength. Inspired by the inherent layered structure of marine arthropods (lobsters), core–shell (SiO2–NH2@OPG) with amine-functionalized silica (SiO2–NH2) core and oxidized pyrogallol (OPG) shell is prepared in this study. The compound blended CS produce structural biomimetic wood (SiO2–NH2@OPG/CS) excellent performance. In addition thermocompressive curing, exhibits water-evaporation-induced curing behavior at room temperature. With reference design mechanism lobster cuticle, microphase-separated consists clustered nanofibers varying amounts SiO2–NH2@OPG particles between fibers. This intriguing microphase its mechanical effects could offer powerful solution for improving functional modification composites.

Language: Английский

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Desirable Strong and Tough Adhesive Inspired by Dragonfly Wings and Plant Cell Walls

ACS Nano, Journal Year: 2024, Volume and Issue: 18(13), P. 9451 - 9469

Published: March 7, 2024

The production of wood-based panels has a significant demand for mechanically strong and flexible biomass adhesives, serving as alternatives to nonrenewable toxic formaldehyde-based adhesives. Nonetheless, plywood usually exhibits brittle fracture due the inherent trade-off between rigidity toughness, it is susceptible damage deformation defects in applications. Herein, inspired by microstructure dragonfly wings cross-linking structure plant cell walls, soybean meal (SM) adhesive with great strength toughness was developed. strategy combined multiple assembly system based on tannic acid (TA) stripping/modification molybdenum disulfide (MoS2@TA) hybrids, phenylboronic acid/quaternary ammonium doubly functionalized chitosan (QCP), SM. Motivated wings, MoS2@TA tightly bonded SM framework through Schiff base hydrogen bonding dissipate stress energy crack deflection, bridging, immobilization. QCP imitated borate chemistry walls optimize interfacial interactions within ester bonds, boron–nitrogen coordination electrostatic sacrificial bonding. shear SM/QCP/MoS2@TA were 1.58 MPa 0.87 J, respectively, which 409.7% 866.7% higher than those pure adhesive. In addition, gave good mildew resistance, durability, weatherability, fire resistance. This bioinspired design offers viable sustainable approach creating multifunctional tough biobased materials.

Language: Английский

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Biodegradable, Strong, and Hydrophobic Regenerated Cellulose Films Enriched with Esterified Lignin Nanoparticles

Small, Journal Year: 2024, Volume and Issue: 20(33)

Published: March 26, 2024

The scientific community is pursuing significant efforts worldwide to develop environmentally viable film materials from biomass, particularly transparent, high-performance regenerated cellulose (RC) films, replace traditional plastics. However, the inferior mechanical performance and hydrophilic nature of RC films are generally not suitable for use as a substitute plastics in practical applications. Herein, lignin homogenization used synthesize composite films. esterified nanoparticles (ELNPs) with dispersible binding advantages prepared through esterification nanometrization. In presence ELNPs, exhibit higher tensile strength (110.4 MPa), hydrophobic (103.6° water contact angle, 36.6% absorption at 120 min, 1.127 × 10

Language: Английский

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Permeable, Stretchable, and Recyclable Cellulose Aerogel On-Skin Electronics for Dual-Modal Sensing and Personal Healthcare

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 12, 2025

Flexible on-skin electronics present tremendous popularity in intelligent electronic skins (e-skins), healthcare monitoring, and human-machine interfaces. However, the reported e-skins can hardly provide high permeability, good stretchability, large sensitivity are limited long-term stability efficient recyclability when worn on human body. Herein, inspired from skin, a permeable, stretchable, recyclable cellulose aerogel-based system is developed by sandwiching screen-printed silver sensing layer between biocompatible CNF/HPC/PVA (cellulose nanofiber/hydroxypropyl cellulose/poly(vinyl alcohol)) aerogel hypodermis permeable polyurethane as epidermis layer. The displays tensile strength of 1.14 MPa strain 43.5% while maintaining permeability. embrace appealing performances with (gauge factor ≈ 238), ultralow detection limit (0.1%), fast response time (18 ms) under stimulus. Owing to disconnection reconnection microcracks layer, both strain/humidity thermal be easily achieved. further integrated into an mask for patient-centered power supply system, switching control device, wireless Bluetooth module. Moreover, prepared enables wearing skin without irritation, all components recaptured/reused water. This material strategy highlights potential next-generation permeability environmental friendliness.

Language: Английский

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Supramolecular Scale Hydrophilicity Regulation Enabling Efficient Dewatering and Assembly of Nanocellulose into Dense and Strong Bulk Materials as Sustainable Plastic Substitutes

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 19, 2025

Abstract Cellulose nanofibers (CNFs) are ideal building blocks for creating lightweight and strong bulk structural materials due to their unique supramolecular structure exceptional mechanical properties within the crystalline regions. However, assembling CNFs into dense with customizable shape functionalities remains a great challenge, hindering practical applications. Here, dewatering issue of aqueous CNF dispersions is addressed by regulating scale hydrophilicity using lactic acid, combined hot‐press molding. This approach enables fabrication transparent density up 1.426 g cm −3 . The properties, including isotropic in‐plane tensile strength (75.5 ± 4.5 MPa), flexural (198 20 hardness (≈300 surpass most engineering plastics. Moreover, unlike conventional based materials, exhibit remarkable water stability flame retardancy. These advantages open new avenue bottom‐up assembly high‐performance multifunctional eco‐friendly dedicating substitution plastics easing consumption petrochemical resources.

Language: Английский

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A Strong and Water‐Retaining Biomass Adhesive Inspired by Tofu

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 9, 2025

Abstract The poor mechanical strength and low water retention of biomass adhesives present significant challenges when substituting petrochemical in practical applications. Inspired by the colloidal gel structure Tofu, development a high‐performance protein‐based adhesive derived from soybean meal (SM) oxidized glucose oxidase (GOx) calcium sulfate oligomer (CSO) is reported. catalytic oxidation sugars SM GOx produces active carboxyl groups, increasing sites for bridge (sugar‐protein) formation CSO. Concurrently, disrupts internal electrostatic equilibrium SM, promoting an acid‐induced gel‐like network structure. This Tofu‐like structures can effectively minimize evaporation significantly enhance interfacial adhesion. Plywood bonded with modified demonstrates 129% increase wet compared to unmodified counterparts. Additionally, loss rate reduced 30.66% at 30 minutes, while maintaining 70.37% its initial strength. enzymatically mediated organic–inorganic hybrid represents promising strategy future sustainable adhesives.

Language: Английский

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Engineering eco-friendly and biodegradable biomass-based multifunctional antibacterial packaging films for sustainable food preservation

Food Chemistry, Journal Year: 2023, Volume and Issue: 439, P. 138119 - 138119

Published: Dec. 1, 2023

Language: Английский

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High Toughness, Multi-dynamic Self-Healing Polyurethane for Outstanding Energy Harvesting and Sensing

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(50), P. 58806 - 58814

Published: Dec. 6, 2023

Triboelectric nanogenerators (TENGs) are an emerging class of energy harvesting devices with considerable potential across diverse applications, including wearable electronic and self-powered sensors. However, sustained contact, friction, incidental scratches during operation can lead to a deterioration in the electrical output performance TENG, thereby reducing its overall service life. To address this issue, we developed self-healing elastomer by incorporating disulfide bonds metal coordination into polyurethane (PU) chain. The resulting demonstrated exceptional toughness, high value 85 kJ m–3 impressive efficiency 85.5%. Specifically, TENG based on that PU generated short circuit current 12 μA, open voltage 120 V, transfer charge 38.5 nC within 2 cm × area, operating contact-separation mode. With external resistance 20 MΩ, achieved power density 2.1 W m–2. Notably, even after self-healing, was maintained at 95% undamaged device. Finally, employed construct noncontact sensing system be applied monitor human motion accurately. This research may expand application prospects materials future human–computer interaction fields.

Language: Английский

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