N-Sulfonyl Guanidine Urea to Design Ultrastrong, Stable, and Recyclable Associative Dynamic Polyurea Networks DOI
Zhen Yu, Yanlin Liu, Sheng Wang

и другие.

Macromolecules, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 20, 2024

Dynamic covalent adaptive networks can solve the recycling issue of thermosets. However, dissociative dynamic may suffer from instability and network incompleteness at high temperatures or in solvents. Here, we report a novel bond, N-sulfonyl guanidine urea (SGUA), that undergo catalyst-free metathesis reactions, which passivation strategy increasing dissociation temperature by introducing electron-withdrawing groups into adjacent positions was developed. Unlike conventional bonds, SGUAs exhibit associative reactions around 120–180 °C, with threshold 180 °C. The polyurea constructed SGUAs, named PSGUAs, exhibits ultrastrong (Young's modulus exceeding 4 GPa tensile strength 60 MPa) stable (thermal stability, structure integrity under reprocessing, dimensional stability) performances. Furthermore, due to excellent characteristics PSGUAs were successfully reprocessed after 30–60 min hot pressing 160 °C 20 MPa. Combining long-lasting antibacterial properties long-term use, this study marks substantial improvement field polymer networks, giving solution for balancing material performance, reprocessability.

Язык: Английский

Malleable, Ultrastrong Antibacterial Thermosets Enabled by Guanidine Urea Structure DOI Creative Commons
Zhen Yu, Qiong Li, Yanlin Liu

и другие.

Advanced Science, Год журнала: 2024, Номер 11(30)

Опубликована: Июнь 13, 2024

Abstract Dynamic covalent polymers (DCPs) that strike a balance between high performance and rapid reconfiguration have been challenging task. For this purpose, solution is proposed in the form of new dynamic supramolecular motif—guanidine urea structure (GUAs). GUAs contain complex diverse chemical structures as well unique bonding characteristics, allowing guanidine to demonstrate advanced physical properties. Noncovalent interaction aggregates (NIAs) confirmed GUA‐DCPs through multistage H‐bonding π‐π stacking, resulting an extremely Young's modulus 14 GPa, suggesting remarkable mechanical strength. Additionally, guanamine linkages GUAs, type bond, provide resins with excellent malleability reprocessability. Guanamine metathesis validated using small molecule model compounds, temperature dependent infrared rheological behavior following dissociative exchange mechanism. Moreover, inherent photodynamic antibacterial properties are extensively verified by experiments. Even after undergoing three reprocessing cycles, rate remains above 99% 24 h, highlighting their long‐lasting effectiveness. nature, tuneable composition, combination make them promising candidates for various technological advancements.

Язык: Английский

Процитировано

8
Waterborne dispersion-processed self-healing elastomers with hydrogen-bond locked hydrophobic microdomains for multifunctional applications DOI

Qianshu Wang,

Wenbo Luan,

Xiaodong Sui

и другие.

Journal of Materials Chemistry B, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

This paper reports a novel self-healing WPU elastomer prepared via the aqueous dispersion method, which is endowed with multifunctional properties through hydrogen-bond locked hydrophobic microdomains.

Язык: Английский

Процитировано

0
Meniscus‐Inspired Segmented Network Intercalation Strategy: Stiffened yet Toughened Toward Healable Antifouling Materials DOI

Junhao Xie,

Hao Wu,

Jinqiu Tao

и другие.

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 30, 2025

Abstract Healable antifouling materials contribute a paradigm shift for extending marine infrastructure lifespan by forming continuable biofouling barriers. However, achieving sustainable performance in extreme mechanical stresses remains challenging due to the difficulty of integrating stiffness, toughness, and healing with efficacy. Inspired meniscus, which facilitates efficient load absorption distribution ability through remarkable resilience accurate intercalation between thigh calf bones, structural‐bioinspired segmented network strategy is proposed. This approach integrates secondary meniscus‐inspired bisphenol segments into primary, reorganizing rigid phases optimizing crosslinking primary ensure uniform stress dissipation augment molecular dynamism. design yields 212.32% increase Young’ s modulus (362.42 MPa), 55.62% improvement toughness (169.52 MJ m − 3 ), an enhancement self‐healing efficiency from 72.81% 98.75%. establishes new principle durable healable materials, combining enhanced properties resistance against biofouling.

Язык: Английский

Процитировано

0
Mechanically Robust and Chemically Recyclable Poly(β-Amino Esters)-Based Thermosetting Plastics DOI

Ruoxuan Miao,

Yuhan Ding, Jie Liu

и другие.

ACS Applied Polymer Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 25, 2024

Язык: Английский

Процитировано

1
Dynamic covalent epoxy network of hyperbranched-synergistic-supramolecular: catalyst-free reprocessing, and application in carbon fiber composites recycling DOI Creative Commons

Yueran He,

Yanlin Liu, Zhen Yu

и другие.

Supramolecular Materials, Год журнала: 2024, Номер unknown, С. 100078 - 100078

Опубликована: Окт. 1, 2024

Язык: Английский

Процитировано

1
Dynamic Covalent Epoxy Network of Hyperbranched-Synergistic-Supramolecular: Catalyst-Free Reprocessing, and Application in Carbon Fiber Composites Recycling DOI

Yueran He,

Yanlin Liu, Zhen Yu

и другие.

Опубликована: Янв. 1, 2024

Язык: Английский

Процитировано

0
Closed‐Loop Recyclable and Extrusion Reprocessable Thermosets Enabled by Guanylthiourea Structure DOI Creative Commons
Zhen Yu, Yanlin Liu, Xiangyu Zhou

и другие.

Advanced Science, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 18, 2024

Abstract Plastic recycling is a critical step toward improving waste management and achieving economic recycling. Here, thermoset crosslinked by guanythiourea structure (GTUH network) reported, that addresses the issue of thermosets serial hybridization thiourea guanidine urea. The dual dissociative dynamic exchange reaction guanamine urea thiourea, combined with non‐covalent hydrogen bonding interactions, endows network rapid relaxation ability. GTUH networks, in particular, can be recycled through continuous extrusion processing due to multiple reversible mechanisms, as opposed hot pressing alone. Even if reprocessed pressing, only 5 min at 140 °C 10 MPa are required. oxidation enhancement mechanism contributes maintaining or even mechanical properties network. Moreover, reactions allow for closed‐loop chemical Research into recyclable carbon fiber‐reinforced composites indicates promising potential applications this material circular economy resources.

Язык: Английский

Процитировано

0
N-Sulfonyl Guanidine Urea to Design Ultrastrong, Stable, and Recyclable Associative Dynamic Polyurea Networks DOI
Zhen Yu, Yanlin Liu, Sheng Wang

и другие.

Macromolecules, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 20, 2024

Dynamic covalent adaptive networks can solve the recycling issue of thermosets. However, dissociative dynamic may suffer from instability and network incompleteness at high temperatures or in solvents. Here, we report a novel bond, N-sulfonyl guanidine urea (SGUA), that undergo catalyst-free metathesis reactions, which passivation strategy increasing dissociation temperature by introducing electron-withdrawing groups into adjacent positions was developed. Unlike conventional bonds, SGUAs exhibit associative reactions around 120–180 °C, with threshold 180 °C. The polyurea constructed SGUAs, named PSGUAs, exhibits ultrastrong (Young's modulus exceeding 4 GPa tensile strength 60 MPa) stable (thermal stability, structure integrity under reprocessing, dimensional stability) performances. Furthermore, due to excellent characteristics PSGUAs were successfully reprocessed after 30–60 min hot pressing 160 °C 20 MPa. Combining long-lasting antibacterial properties long-term use, this study marks substantial improvement field polymer networks, giving solution for balancing material performance, reprocessability.

Язык: Английский

Процитировано

0