Progress in Organic Coatings, Год журнала: 2024, Номер 197, С. 108828 - 108828
Опубликована: Сен. 24, 2024
Язык: Английский
European Polymer Journal, Год журнала: 2023, Номер 187, С. 111878 - 111878
Опубликована: Фев. 3, 2023
Язык: Английский
Процитировано
63
Macromolecules, Год журнала: 2023, Номер 56(14), С. 5290 - 5305
Опубликована: Июль 3, 2023
Large-scale applications of flame-retardant epoxy resins have caused sustainability concerns on the use renewable resources and end-of-life wastes. New strategies are required to address chemical recycling fire-safe resins. Here, we demonstrated recyclable (FREPs) using itaconic acid-derived hyperbranched resin (IA-EHBP) (1,3,5-hexahydro-s-triazine-1,3,5-triyl) benzyl mercaptan (HT-BM). The unique structure enabled a closed-loop network that can be degraded into monomers with up 86% yield recovered monomers. topological IA-EHBP also contributed significant improvement in strength toughness FREPs. By positron annihilation lifetime spectroscopy, effects free-volume hole size relative fractional mechanical performance dynamic properties FREPs were studied, function relations therefore established based Williams–Landel–Ferry equation. incorporation effectively promoted formation char residue produced phosphorus- sulfur-containing free radicals prevent generation combustible volatiles, thus enhancing flame retardancy. recycled reused multiple times without loss performance. method reported here provides facile approach for high-efficiency reuse materials.
Язык: Английский
Процитировано
42
Reactions, Год журнала: 2023, Номер 4(1), С. 66 - 91
Опубликована: Янв. 2, 2023
Nearly 90% of thermosets are produced from petroleum resources, they have remarkable mechanical characteristics, chemically durable, and dimensionally stable. However, can contribute to global warming, depletion reserves, environmental contamination during manufacture, use, disposal. Using renewable resources form thermosetting materials is one the most crucial aspects addressing aforementioned issues. Vanillin-based raw been used in industrial manufacturing polymer because simple modify structurally. Conversely, traditional as a broad class high-molecular-weight molecules challenging heal, decompose recover owing their permanent 3-D crosslinking network. Once products damaged, recycling issues could arise, causing resource loss impact. It be solved by inserting dynamic covalent adaptable networks (DCANs) into chains, increasing product longevity, minimizing waste. also improves attractiveness these prospective field. Moreover, it essential underline that lifespan reducing waste equivalent expense consuming resources. The detailed synthesis, reprocessing, thermal, characteristics partly entirely biomass polymers made vanillin-modified monomers covered current work. Finally, review highlights benefits, difficulties, application emerging vitrimers potential replacement for conventional non-recyclable thermosets.
Язык: Английский
Процитировано
32
Polymer Degradation and Stability, Год журнала: 2024, Номер 229, С. 110980 - 110980
Опубликована: Авг. 26, 2024
Язык: Английский
Процитировано
10
ACS Applied Polymer Materials, Год журнала: 2022, Номер 5(1), С. 279 - 289
Опубликована: Дек. 5, 2022
Growing sustainability concerns have promoted the rapid development of reusable and environmentally friendly thermosetting materials. Herein, a recyclable biobased curing agent (vanillin-based imine agent) was produced from vanillin in single-stage process. However, this fully solid difficult to process, requiring large amounts solvent during processing. Since viscosity 4-methyl-1,3-cyclohexendiamine (HTDA) is low, it can be used as cocuring at various make viscous liquid for diglycidyl ether bisphenol F. The behaviors thermomechanical mechanical properties cured thermosets were evaluated along with their self-healing ability. results reveal that activation energy are reduced weight ratio HTDA increases, whereas flexural strength (106–122 MPa), moduli (2365–2587 Tg values (95–110 °C) increase gradually. Additionally, heat-resistant temperature (Ts) (166–162 char residue 700 °C (26–10%) samples continuously decreased. Overall, 40% HDTA containing VH03 showed suitable form processing thermal properties. Subsequently, retention still 80% 115 °C, respectively, also demonstrated absolute resistance room temperature. excellent integrated clarified favorable easy processability, recyclability, sustainable improvement.
Язык: Английский
Процитировано
34
ACS Applied Polymer Materials, Год журнала: 2022, Номер 4(8), С. 5708 - 5716
Опубликована: Июнь 29, 2022
The development of recyclable thermosets with high performance from renewable resources is highly desirable the concerns environmental and resource economics. Here, a full biobased carboxyl-containing epoxy hardener (CF-quercetin) was prepared quercetin succinic anhydride (starch/sugar derivative) through mild one-step reaction. resin cured by CF-quercetin shows tensile strength (92 MPa) comparable commercial counterparts storage modulus (3800 at room temperature. Owing to content dynamic ester bonds in networks, can be repeatedly reprocessed like thermoplastics, 91% recovery first reprocessing cycle achieved. Meanwhile, glass-transition temperature thermal stability remain almost constant compared original resin. Furthermore, presents rapid degradation alkali aqueous solution (NaOH, 1 M) within 6 h temperature, but it fully nondegradable acidic neutral solutions over period 120 days. also acceptable many conventional organic solvents. Taken together, our work provides simple method prepare universal quercetin-based for resins reprocessability, degradability, mechanical performance.
Язык: Английский
Процитировано
33
ACS Applied Polymer Materials, Год журнала: 2024, Номер 6(15), С. 9312 - 9322
Опубликована: Июль 24, 2024
A series of renewable lignin-derived imine hardeners (LDIHs) with different contents methoxy-group (n = 0–2) were successfully prepared using lignin-derivative aldehydes (hydroxybenzaldehyde─M0, vanillin─M1, and syringaldehyde─M2) cyclohexane diamine, used to cure epoxy monomers. The structural confirmation LDIHs was performed by Fourier transform infrared spectroscopy (FTIR), gas chromatography–mass spectrometry (GCMS), NMR spectroscopy. curing behavior mechanical thermal properties the resulting thermosets evaluated differential scanning calorimetry (DSC), tensile analysis, thermogravimetric analysis (TGA), dynamic analyzer (DMA). Enhancing number methoxy groups lowered reactivity between Interestingly, cured exhibited significantly distinct (108–106 MPa flexural strength 2.44–2.35 GPa moduli, 87–83 2.6–2.4 moduli), thermo-mechanical (3.1–2.9 glassy moduli 94–82 °C Tg), (307–288 Td5%) due incorporation varying in LDIHs. This is because oxygen content electron-donating effects high-methoxy-content thermosets. Moreover, these three can be reprocessed repaired several times without losing their incorporating bond into molecular structures. Notably, pendant attached influences performances M2 displays quickest stress relaxation level. Finally, all products showed excellent chemical stability various solvents. These remarkable findings offer important clues for comprehending structure–property link recyclable groups.
Язык: Английский
Процитировано
9
Progress in Organic Coatings, Год журнала: 2024, Номер 187, С. 108191 - 108191
Опубликована: Янв. 2, 2024
Язык: Английский
Процитировано
8
Polymer Degradation and Stability, Год журнала: 2025, Номер 234, С. 111240 - 111240
Опубликована: Янв. 31, 2025
Язык: Английский
Процитировано
1
ACS Applied Polymer Materials, Год журнала: 2023, Номер 5(5), С. 3768 - 3776
Опубликована: Апрель 25, 2023
For inorganic flame retardants, facile fabrication and high-efficiency fire safety without compromising the mechanical property of matrix are still significant challenges. Here, nanolayered double hydroxide containing boron constructed on surface ammonium polyphosphate (APP) complexes (B-LDH@APP) is prepared by a simple in situ coprecipitation technology to reduce hazard improves performances epoxy resin (EP). The as-obtained 4B-LDH@APP/EP achieves UL-94 V-0 rating presents superior flame-safety performance. With respect 4APP/EP, growth rate (FIGRA), peak heat release (pHRR), smoke production (pSPR) decrease 77.8, 57.3, 52.6%, respectively. This mainly attributed excellent synergistic flame-retardant effect among boron, LDH, APP, which can accelerate generation compact charring residual with good microstructure during combustion B-LDH@APP/EP composites. Furthermore, B-LDH@APP slightly affects EP due upgraded interfacial interaction.
Язык: Английский
Процитировано
17