Closed-Loop Recycling of Tough Epoxy Supramolecular Thermosets Constructed by Hyperbranched Topological Structure DOI Creative Commons
Junheng Zhang, Can Jiang,

Guoyan Deng

et al.

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: Dec. 13, 2023

Abstract Covalent adaptable networks are critical for the recycling and reuse of cross-linked epoxy thermosets. However, a major challenge is to develop efficient recyclable strategies while maintaining high-performance Here, we synthesized vanillin-based hyperbranched resin (VanEHBP) prepare tough supramolecular The structures were constructed with VanEHBP via intermolecular hydrogen bonds, intramolecular cavities, dual dynamic covalent bonds (imine exchange transesterification). thermosets exhibited excellent mechanical properties, as well fast reprocessability, which can be reprocessed at 120°C within 30 sec maintain about 100% tensile strength. Importantly, easily fully recycled under room temperature recovered materials preserve 93.5% properties original samples. This wok represents unique strategy developing room-temperature closed-loop superior comprehensive performance promising practical application prospects.

Language: Английский

Ultrastrong, High Fire Resistance, Repairable, and Recyclable Fluorinated Biobased Polyimine Networks DOI
Jue Wang,

Hongliang Ding,

Ping Yu

et al.

ACS Materials Letters, Journal Year: 2024, Volume and Issue: 6(8), P. 3899 - 3908

Published: July 25, 2024

Traditional commercial thermosetting materials are currently facing significant challenges in terms of reprocessing, degradation, and recycling because a large demand petroleum resources, leading to environmental burden. In our work, trialdehyde monomer synthesized by renewable resource reacted with 1,4-Bis(4-amino-2-trifluoromethylphenoxy)benzene 1,4-Bis(4-aminophenoxy)benzene form dynamic cross-linked network called BQPs. The fluorinated biobased polyimine material exhibits exceptional mechanical properties tensile strength 96.2 MPa, which is much higher than plastics such as polycarbonate (∼65 MPa). Moreover, it demonstrates excellent flame retardancy achieving level V0 rating the UL-94 test value 50% limiting oxygen index test. Additionally, can be easily reprocessed within 10 min at high temperature (160 °C) rapidly repaired solvent. Overall, this high-performance product will significantly contribute expanding development materials.

Language: Английский

Citations

16
Biobased Polybenzoxazine Vitrimer with Imine Bonds: Shape Memory, Reprocessing, and Degradation DOI

Yefan Qu,

Xin Lu, Zhong Xin

et al.

ACS Sustainable Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 12(20), P. 7739 - 7747

Published: May 9, 2024

A biobased reprocessable and degradable polybenzoxazine vitrimer was prepared by introducing dynamic imine bonds. An aldehyde-containing benzoxazine monomer (VSA) synthesized through the Mannich reaction of vanillin, stearylamine, paraformaldehyde, then VSA reacted with 1,12-dodecanediamine to prepare an imine-containing (VSA-dda). The curing behaviors VSA-dda were characterized in situ Fourier-transform infrared spectroscopy differential scanning calorimetry. exchange bonds within cross-linked network (PVSA-dda) studied stress relaxation experiments. Due presence bonds, PVSA-dda could be reprocessed hot-pressing at 140 °C under 2 MPa. exhibited a shape memory property recover its original heating 100 °C. degradation performance investigated various conditions, results showed that degraded 29 min acidic solution tetrahydrofuran water 50

Language: Английский

Citations

15
Phosphorus/boron-containing, flame-retardant polyurethane elastomers with great mechanical, shape-memory, and recycling performances DOI Creative Commons
Tiantian Zhang, Siqi Huo, Guofeng Ye

et al.

Polymer Degradation and Stability, Journal Year: 2024, Volume and Issue: unknown, P. 111047 - 111047

Published: Oct. 1, 2024

Language: Английский

Citations

9
Weldable, Reprocessable, and Water‐resistant Polybenzoxazine Vitrimer Crosslinked by Dynamic Imine Bonds DOI
Sujuan Zhang,

Jianjun Yi,

Jiming Chen

et al.

ChemSusChem, Journal Year: 2024, Volume and Issue: 17(14)

Published: March 4, 2024

Abstract Traditional polybenzoxazine thermosets cannot be reprocessed or recycled due to the permanent crosslinked networks. The dynamic exchangeable characteristics of imine bonds can impart networks with reprocessabilities and recyclabilities. This study reported a weldable, reprocessable, water‐resistant vitrimer (C‐ABZ) by bonds. It was synthesized through condensation reaction between an aldehyde‐containing benzoxazine oligomer (O‐ABZ) 1,12‐dodecanediamine. resulting C‐ABZ able welded exchange tensile strengths after three cycles hot‐pressing were 76.7, 81.3, 70.8, 58.1 Mpa, corresponding strength recovery ratios 74.1 %, 78.6 68.4 56.1 respectively. Furthermore, backbone significantly improved water resistance After immersing in for 30 days at room temperature, weight gain less than 1 % retention ratio 59.5 Mpa 57.5 Although heat decreased slightly increased cycles, glass transition temperature ( T g, tanδ ) 150 °C retained third hot‐pressing. Overall, these findings demonstrate that possesses excellent comprehensive performances.

Language: Английский

Citations

6
Biobased and aromatic Covalent Adaptable Networks: When architectures meet properties, within the framework of a circular bioeconomy DOI Creative Commons
Lisa Sougrati, Antoine Duval, Luc Avérous

et al.

Materials Science and Engineering R Reports, Journal Year: 2024, Volume and Issue: 161, P. 100882 - 100882

Published: Nov. 9, 2024

Language: Английский

Citations

4
A Design of Transesterification Vitrimers with Variable Fractions of Network Defects and the Creep Characteristics DOI

Takaya Inaba,

Mikihiro Hayashi

Macromolecular Chemistry and Physics, Journal Year: 2024, Volume and Issue: 225(13)

Published: March 14, 2024

Abstract Vitrimer materials have attained great interest owing to their sustainable functions and distinctive physical properties. Compared with conventional cross‐linked materials, the thermoplastic‐like nature, such as stress relaxation creep at high temperatures, is outstanding, which activation of bond exchange in network. The temperature exchange, so‐called topology freezing ( T v ), are treated important material parameters, non‐isothermal (i.e., temperature‐ramp) test one method determine . This study investigates effects network defects, that is, breaking point connectivity, on transesterification vitrimer samples varying fraction defects designed using thiol‐epoxy click reaction, where overall units, ester hydroxyl group, kept constant. Non‐isothermal tests conducted temperature‐ramp rate applied levels, difference behaviors > discussed terms strand diffusion during chain elongation under stress.

Language: Английский

Citations

4
Investigating UV Light and Ziram Catalyst as Alternative Activators for Sulfur-Promoted Benzoxazine Curing DOI
Cansın Birsen Buldum,

Tugberk Tabak,

Barış Kışkan

et al.

Polymer, Journal Year: 2024, Volume and Issue: unknown, P. 127745 - 127745

Published: Oct. 1, 2024

Language: Английский

Citations

3
Reconfigurable and recyclable High-Temperature triple shape memory polymers from upcycling of commercial Nylon 6 vitrimers DOI

Guk-Yun Noh,

Juhyen Lee,

Mingeun Kim

et al.

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 159549 - 159549

Published: Jan. 1, 2025

Language: Английский

Citations

0
Understanding Degradation Dynamics of Azomethine-containing Conjugated Polymers DOI Creative Commons

Ariane Charland‐Martin,

Graham S. Collier

Macromolecules, Journal Year: 2024, Volume and Issue: 57(13), P. 6146 - 6155

Published: June 18, 2024

Understanding the influence of chemical environments on degradation properties conjugated polymers is an important task for continued development sustainable materials with potential utility in biomedical and optoelectronic applications. Azomethine-containing were synthesized via palladium-catalyzed direct arylation polymerization (DArP) used to study fundamental trends upon exposure acid. Shifts UV-vis absorbance spectra appearance/disappearance aldehyde imine diagnostic peaks within

Language: Английский

Citations

2
Developing high-strength, healable, and recyclable shape memory vitrimers through in situ dynamical crosslinking between ethylene-vinyl acetate copolymer and graphene oxide DOI
Dan Liu, Yi Xiao,

Wu‐Cheng Nie

et al.

Composites Part A Applied Science and Manufacturing, Journal Year: 2024, Volume and Issue: unknown, P. 108624 - 108624

Published: Nov. 1, 2024

Language: Английский

Citations

2