Heat-Resistant Shape Memory Fully Biobased Epoxy Resins with High Storage Modulus and Recycle Performance DOI
Hongpeng Yang, Li Yuan, Guozheng Liang

et al.

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 3, 2024

Combining high heat resistance and green sustainability is a great challenge in developing shape memory epoxy resins. Herein, starting from synthesizing fully biobased trifunctional compound (ER), kind of resin system (EFTx, where x the molar ratio carboxyl to groups) developed. The effects on structure properties EFTx resins were systematically investigated. Results show that cured have excellent resistance, mechanical properties, performance, recycle ability. As increases, glass transition temperature (Tg) initial thermal decomposition (Tdi) decrease while both self-healing efficiency remolding increase. Tg storage modulus each are much higher than those reported Among resins, EFT1.0 shows best-integrated performance; specifically, its Tg, Tdi, tensile strength, as 156 °C, 293 40.99 MPa, 90.5%, respectively, meanwhile it also has outstanding property reflected by fixation (Rf = 100%) recovery (Rr 97.8%) under bend-recovery experiments well Rf (93.2%) Rr (66.1%) after four cycles. integrated performance attributed their unique structures combine rigid stilbene structure, furan ring, abundant ester bonds.

Language: Английский

Hierarchical Engineering on Built‐In Electric Field of Bimetallic Zeolitic Imidazolate Derivatives Towards Amplified Dielectric Loss DOI Open Access
Shijie Zhang, Jiajun Zheng, Di Lan

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 7, 2024

Abstract Construction of built‐in electric field (BIEF) in nanohybrids has been demonstrated as an efficacious strategy to boost the dielectric loss by facilitating oriented transfer and transition charges, thus optimizing electromagnetic wave absorption property. However, specific influence BIEF on interface polarization needs explore thoroughly strength should be further augmented. Herein, several systems incorporated Mott–Schottky heterojunctions hollow structures are designed constructed, where bimetallic zeolitic imidazolate framework employed derive Cu‐ZnO heterojunctions, hierarchical enriched introducing structure reduced graphene oxide. The well‐established “double” verified theoretical calculation engineering can regulate conductivity, enhance relaxation effectively. Especially, there always coexisted both enhanced charge separation reversed distribution this BIEF, boosting polarization. Attributing synergy well‐matched impedance amplified loss, obtained hybrids exhibited superior (reflection −46.29 dB ultra‐wide effective bandwidth 7.6 GHz at only 1.6 mm). This work proves innovative model for dissecting mechanisms pioneers a novel advanced absorbers through enhancing BIEF.

Language: Английский

Citations

29
Designing Strong yet Tough, Multifunctional and Printable Dynamic Cross‐Linking Waterborne Polyurethane for Customizable Smart Soft Devices DOI
Xingyuan Lu, Hongqiu Wei, Ping Zhang

et al.

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

Published: April 7, 2025

Abstract Dynamic cross‐linking waterborne polyurethanes (DCWPU) are gaining increasing attention for their great potential in soft materials, flexible sensors, robotics, and bioelectronic devices. However, achieving a facile straightforward design of strong yet tough, multifunctional, printable DCWPU customizable smart devices is still challenging this field. Here, simple versatile visible‐light‐mediate situ metal‐ligand coordination (VSMC) strategy reported to fabricate high‐performance DCWPU. This photochemical enables the rapid controllable release metal ions from ethylenediaminetetraacetic acid salts, orthogonally triggering classical radical polymerization. The resulting homogeneous metal‐coordinated network significantly enhances stretching strain, stress, toughness reversibility further imparts excellent shape memory, shape‐reconfigurable self‐healing features when exposed heat stimuli. Moreover, efficient VSMC greatly reduces gelation time under 5 s, which improves its printability structural design. Leveraging these advanced performances, application demonstrated. work expected open new avenues

Language: Английский

Citations

1
Ligand Dissociation of Metal-Complex Photocatalysts toward pH-Photomanipulation in Dynamic Covalent Hydrogels for Printing Reprocessable and Recyclable Devices DOI
Qian Wang,

Zhenhao Zhu,

Jupen Liu

et al.

ACS Macro Letters, Journal Year: 2024, Volume and Issue: 13(6), P. 664 - 672

Published: May 16, 2024

Dynamic covalent hydrogels are gaining attention for their potential in smart materials, soft devices, electronics, and more thanks to impressive mechanical properties, biomimetic structures, dynamic behavior. However, a significant challenge lies designing precise efficient photochemistry preparation, allowing complex structures control over the process. Herein, we propose general straightforward orthogonal strategy preparing high-performance printable hydrogels, thereby broadening advanced applications. This photochemical uses bifunctional photocatalyst initiate radical polymerization release ligands through rapid light-mediated dissociation mechanism. process leads controlled increase system pH from mildly acidic alkaline conditions within one hundred seconds, which turn triggers pH-sensitive model reactions of boronic acid/diol complexation Knoevenagel condensation. The enables formation interpenetrated conjoined networks, significantly enhancing properties hydrogels. reversible bonds formed during process, i.e., ester unsaturated ketone bonds, confer excellent self-healing, reprocessable, recyclable on variations. Furthermore, this rapid, fabrication behavior highly compatible with printing techniques, enabling design adaptive sensors different structures. These advancements promising various material science, medicine, engineering

Language: Английский

Citations

3
Fully Recyclable Pluripotent Networks for 3D Printing Enabled by Dissociative Dynamic Bonds DOI Open Access
Marco Caliari, Fernando Vidal, Daniele Mantione

et al.

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

Published: March 2, 2025

Abstract Additive manufacturing (AM) has risen in popularity due to its ability produce complex shapes a material‐efficient way. However, objects with advanced properties, multimaterial strategies are often employed. This one‐polymer‐one‐property paradigm significantly slows down the application of AM, and particular fused deposition modeling (FDM), for functional objects. In this study advantage pluripotency materials is taken, i.e., attain different properties from single stock, afford mechanically tunable 3D printed dynamic thermosets (moduli 2 MPa – 3 GPa, 1500× increase, Stress at break 70 MPa, 35× increase). To do so, FDM‐compatible CO ‐derived dissociative polymer networks designed that undergo reaction‐induced phase‐separation (DRIPS). strategy enables control size rigid phase simple post‐printing thermal treatment, cascading spatially patterned mechanical properties. showcases new directions printing communities, deep implications soft robotics compliant mechanics.

Language: Английский

Citations

0
Schiff Base Crosslinked Poly(γ-glutamic acid) Composite Films with High Mechanical Strength and Remoldability DOI Creative Commons
Yao Ying, Yu‐I Hsu, Hiroshi Uyama

et al.

Polymer Degradation and Stability, Journal Year: 2025, Volume and Issue: unknown, P. 111450 - 111450

Published: May 1, 2025

Language: Английский

Citations

0
Spreading of Dynamically Crosslinked Polydimethylsiloxane Drops DOI Open Access
Kyujin Ko, Krishnaroop Chaudhuri, Junyong Park

et al.

Journal of Polymer Science, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 17, 2024

ABSTRACT Dynamically crosslinked polymer networks, characterized by non‐permanent bonds, offer unique viscoelastic properties that can be used for various applications such as self‐healing coatings and reusable adhesives. This study investigates the spreading behavior of a silicone network with dynamic imine focusing on relationship between material dynamics. We prepare polydimethylsiloxane (PDMS) networks varied rheological adjusting ratio amine aldehyde groups curing conditions. The PDMS spherical drops is investigated surfaces different surface energies, process quantified measuring contact length height over time. Our findings reveal higher modulus spheres spread more slowly, increases high energy surfaces. research could provide insights developing adhesives tunable studying interaction transiently‐crosslinked polymers substrates during spreading.

Language: Английский

Citations

1
Heat-Resistant Shape Memory Fully Biobased Epoxy Resins with High Storage Modulus and Recycle Performance DOI
Hongpeng Yang, Li Yuan, Guozheng Liang

et al.

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 3, 2024

Combining high heat resistance and green sustainability is a great challenge in developing shape memory epoxy resins. Herein, starting from synthesizing fully biobased trifunctional compound (ER), kind of resin system (EFTx, where x the molar ratio carboxyl to groups) developed. The effects on structure properties EFTx resins were systematically investigated. Results show that cured have excellent resistance, mechanical properties, performance, recycle ability. As increases, glass transition temperature (Tg) initial thermal decomposition (Tdi) decrease while both self-healing efficiency remolding increase. Tg storage modulus each are much higher than those reported Among resins, EFT1.0 shows best-integrated performance; specifically, its Tg, Tdi, tensile strength, as 156 °C, 293 40.99 MPa, 90.5%, respectively, meanwhile it also has outstanding property reflected by fixation (Rf = 100%) recovery (Rr 97.8%) under bend-recovery experiments well Rf (93.2%) Rr (66.1%) after four cycles. integrated performance attributed their unique structures combine rigid stilbene structure, furan ring, abundant ester bonds.

Language: Английский

Citations

1