Nucleophilic Aromatic Substitution Tempering the Closed-Loop Recycling of Shape Memory Polymers DOI

Zhangzhang Tang,

Zenghui Yang, Liming Tao

et al.

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

Published: Dec. 13, 2024

The dynamic covalent bond (DCB) strategy endows the polymer with recyclability, enabling resourceful recycling, energy conservation, and addressing environmental pollution issues, thereby garnering significant attention currently in field. Here, we achieved closed-loop recycling of a series shape memory polymers (SMPs) through nucleophilic aromatic substitution (SNAr) reaction. First, SNAr reaction facilitated high-strength, high-transition-temperature cyanate esters (SMCEs) their composite (SMCEC) into triethoxytriazine (TETA) diols. recycled monomers can then be used to synthesize SMPs tailored mechanical properties broad range transition temperatures, including epoxy resins, ester elastomers, 4D printing elastomers. TETA again from elastomers Furthermore, devised two innovative strategies for materials produce actuators high resolution. Notably, polyacrylate elastomer, which undergoes situ cross-linking after postheating reactions, presents groundbreaking method high-performance utilizing DCBs. This work not only provides an achieving but also introduces interesting approach SMPs.

Language: Английский

Epoxy Vitrimer with Excellent Mechanical Properties and High Tg for Detachable Structural Adhesives DOI
Anping Dong,

Qiguang Liu,

Huarui Yao

et al.

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: 17(9), P. 14578 - 14590

Published: Feb. 22, 2025

It is a long-standing challenge for thermoset resins to simultaneously achieve outstanding thermomechanical and mechanical properties as well rapid network reconfiguration due the trade-off between chemical bond transformation stability of network. The design vitrimer topology an effective strategy address above issues. Here, we prepared epoxy material (DGEBA-API-MHHPA) with excellent high glass-transition temperature (Tg) by introducing rigid-flexible integrated side chains [1-(3-aminopropyl) imidazole (API)], which endow DGEBA-API-MHHPA multiple interactions including "internal antiplasticization" effect, intermolecular hydrogen bonds, π-π interactions. Moreover, introduction Zn2+ facilitates transesterification, enabling fast rearrangement Specifically, relaxation time DGEBA-API0.2-MHHPA0.8-Zn reaches 65 s at 200 °C. Meanwhile, Zn2+-imidazole coordination bonds energy dissipation improve toughness resulting exhibits self-healing recyclable behaviors possesses 80.3 MPa tensile strength, 3.25 GPa Young's modulus, 7.2 MPa·m1/2 fracture (KIC), Tg 129 Concurrently, can be applied detachable structural adhesives various substrates used matrixes electrically composites. This skillful widely referenced in large-scale manufacturing high-performance dynamic covalent their composites performance.

Language: Английский

Citations

1
High-modulus supramolecular glassy polymers: a review DOI
Yin Wang, Zhong Cao, Tong Liu

et al.

Materials Chemistry Frontiers, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

The concept of recyclability or repairability provides a new approach for extending the service life glassy polymers and addressing environmental pollution issues.

Language: Английский

Citations

0
Nucleophilic Aromatic Substitution Tempering the Closed-Loop Recycling of Shape Memory Polymers DOI

Zhangzhang Tang,

Zenghui Yang, Liming Tao

et al.

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

Published: Dec. 13, 2024

The dynamic covalent bond (DCB) strategy endows the polymer with recyclability, enabling resourceful recycling, energy conservation, and addressing environmental pollution issues, thereby garnering significant attention currently in field. Here, we achieved closed-loop recycling of a series shape memory polymers (SMPs) through nucleophilic aromatic substitution (SNAr) reaction. First, SNAr reaction facilitated high-strength, high-transition-temperature cyanate esters (SMCEs) their composite (SMCEC) into triethoxytriazine (TETA) diols. recycled monomers can then be used to synthesize SMPs tailored mechanical properties broad range transition temperatures, including epoxy resins, ester elastomers, 4D printing elastomers. TETA again from elastomers Furthermore, devised two innovative strategies for materials produce actuators high resolution. Notably, polyacrylate elastomer, which undergoes situ cross-linking after postheating reactions, presents groundbreaking method high-performance utilizing DCBs. This work not only provides an achieving but also introduces interesting approach SMPs.

Language: Английский

Citations

0