Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 480, P. 148091 - 148091
Published: Dec. 16, 2023
Language: Английский
Journal of Material Science and Technology, Journal Year: 2024, Volume and Issue: 199, P. 156 - 183
Published: March 28, 2024
Polymers are indispensable to humans in different applications due their ease of manufacturing and overall performance. However, after a material lifetime, there is large amount polymer-based waste, which greatly contributes the loss valuable resources environmental pollution. Thermoplastics may be readily recycled, but because flammability, amounts flame retardant (FR) additives required for many applications. This results significant volume FR polymeric wastes too, particularly halogenated plastics, subject severe recycling regulations. In general, thermoplastics containing FRs raising concerns, as effective strongly influenced by chemical composition, additive content, physicochemical characteristics waste stream. The thermosets even more challenging crosslinked cured nature, makes them resistant melting reprocessing. cases, traditional mechanical methods, such grinding melting, not applicable thermosetting polymers. Current methods do always consider recovery thermosetting/thermoplastic matrix presence toxic polymer network. Sorting solvent washing treatment important steps, usually performed before reduce contamination following steps. Considering all technical difficulties during recycling, high cost sorting washing, increasing demand sustainable procedures, scientific community fostering transformation toward feasible energy-efficient strategies. Also, directives imposing strict disposal rules, limiting use halogen-based compounds, promoting commercialization recyclable review aims provide general overview currently applied approaches thermosets, possible designing next generation materials. existing strategies polymers summarized. Developments covalent adaptable networks an outlook towards circularity also addressed this review.
Language: Английский
Citations
16
European Polymer Journal, Journal Year: 2024, Volume and Issue: 206, P. 112775 - 112775
Published: Jan. 19, 2024
Language: Английский
Citations
12
Polymer Chemistry, Journal Year: 2024, Volume and Issue: 15(9), P. 884 - 895
Published: Jan. 1, 2024
With neighboring group participation, polypropylene-based transesterification covalent adaptable networks were facilely prepared via the reaction of maleic anhydride grafted polypropylene and diol without using external catalysts.
Language: Английский
Citations
10
ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: unknown
Published: Feb. 7, 2024
Embedding dynamic covalent bonds into polymer compositions transforms static thermosets active materials with the reprocessability of thermoplastics and bulk properties cross-linked networks. This class next-generation materials, called adaptable networks, shows significant promise in composites, soft optoelectronics, robotics. Herein, we synthesized two oligosiloxane-based epoxy networks that provide fast bond exchange. Oligosiloxane diepoxides were cured stoichiometric amounts 1,2-phenylenediacetic acid to generate bonding mechanisms. The resulting provided access stress-relaxation times (1–10 min) at temperatures only 130 °C excellent reprocessability.
Language: Английский
Citations
10
Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 497, P. 154710 - 154710
Published: Aug. 13, 2024
Language: Английский
Citations
10
ACS Materials Letters, Journal Year: 2024, Volume and Issue: 7(1), P. 210 - 219
Published: Dec. 13, 2024
The nondegradability, nonreusability, and flammability of epoxy coatings have brought serious environmental safety issues. Herein, a multifunctional, fire-retardant vitrimer coating (DCNC/45PETO) was prepared via curing bis(2,3-epoxypropyl)cyclohex-4-ene-1,2-dicarboxylate (DCNC) with well-designed phosphaphenanthrene-containing polyethylenimine (PETO) at room temperature. DCNC/45PETO exhibits excellent adhesion to different substrates, high adhesive strength 7.9 MPa on wood, outperforming previous wood coatings/adhesives. endows fire retardancy, including limiting oxygen index 34.0% vertical burning (UL-94) V-0 rating. demonstrates durable performances in harsh environments. self-catalytic transesterification within the network effectively avoids application extra toxic catalysts, this can be reused for least 5 times mild conditions without compromising its performances. This study provides an innovative design strategy creating multifunctional coatings, showing great potential construction field.
Language: Английский
Citations
9
International Polymer Processing, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 20, 2025
Abstract Concerns about the effect on environment and non-renewable nature of plastics have sparked a substantial field study towards creation recyclable polymers. Vitrimers are potential class reusable polymers that recently attracted lot interest. Like conventional thermosets in strength, durability, chemical resistance, these materials offer added benefit being at end their useful life. Their structure, which includes dynamic covalent crosslinks to provide stability while enabling reprocessing, is credited with this special characteristic. We lay out an overview recent developments applications epoxy based vitrimeric by using different types adaptable networks (CANs) – single, dual triple paper attention design tactics make it easier create circular future. Covalent Adaptable Networks (CAN), novel polymer family can bridge gap between thermoplastics, emerged years uses chemistry crosslinked networks. The was enhanced 2011 Leibler colleagues when they introduced notion vitrimers, retain integrity network even after heating allow connections be reallocated within them associative exchange reactions. This review also demonstrates how vitrimer community paying need for sustainable material development demonstrating use biobased building blocks synthesis high-performing vitrimers. Having outlined primary characteristics commercialization vitrimers emphasized portray benefits self-healing, malleability, orthogonal processability, various shape memories along solutions synthetic materials.
Language: Английский
Citations
1
Macromolecules, Journal Year: 2023, Volume and Issue: 56(17), P. 6806 - 6817
Published: Aug. 16, 2023
A vitrimer has covalent cross-links that preserve network connectivity but permit topology fluctuations through dynamic exchange reactions. In this work, we investigate the linear rheology of polybutadiene (PB) vitrimers bearing via dioxaborolane metathesis. PB are cross-linked in solution using photoinitiated thiol-ene click chemistry. As targeted cross-link density is increased, both insoluble fraction and glass-transition temperature increase. Linear viscoelasticity studied a combination small-amplitude oscillatory shear (SAOS), creep, stress relaxation measurements. SAOS, elastic modulus approximately constant while viscous increases as angular frequency decreases. compliance displays power law behavior persists for at least 8 h. relaxation, transitions from rubbery plateau into regime. Both SAOS creep data visually superposed master curves horizontal shift factors exhibit Arrhenius behavior. However, application these determined to fails align single curve. (aSAOS) collapse short-time data, their activation energy (EaSAOS) matches effective Williams–Landel–Ferry homopolymer, indicating dynamics correspond strand segment relaxations. Creep (acreep) long-time (Eacreep) significantly larger than energies predicted by established theoretical models transient networks. We speculate discrepancy between experiment theory due dependence cross-linker mobility within matrix, which not fully captured models.
Language: Английский
Citations
22
EcoMat, Journal Year: 2023, Volume and Issue: 5(9)
Published: June 28, 2023
Abstract Dynamic covalent chemistry offers a solution to tackle the recycling issue of epoxy resins (EPs) and their carbon fiber‐reinforced composites; however, vulnerability creep associated with inflammable nature EPs are key obstacles for applications. Herein, we propose feasible facile strategy overcome these by incorporating phosphorus‐influenced Diels‐Alder (DA) construct dynamic networks. In strategy, electron‐withdrawing phosphonate in dienophile maleimide greatly promotes thermal stability DA reaction, exhibiting excellent resistance, repairability, malleability; while its flame‐retardant activity improves fire safety resultant thermosets. Meanwhile, nondestructive fiber is achieved. The ease which EP composites can be manufactured, used, recycled re‐used–without losing service performance–points new orientation sustainable composites. image
Language: Английский
Citations
21
ACS Sustainable Chemistry & Engineering, Journal Year: 2023, Volume and Issue: 11(38), P. 14112 - 14123
Published: Sept. 5, 2023
Vitrimers are being actively studied as sustainable plastics. To that end, robust vitrimer films fabricated from a ternary aqueous solution of tannic acid (TA), boric (BA), and polyvinyl alcohol (PVA) reported herein. The trimeric include B–O–C dynamic covalent bonds. optimal film exhibits excellent crosslinking density (0.0471 mol/cm3), tensile strength (77 MPa), modulus (3.2 GPa). A carbon–fiber-reinforced (CFRV) was prepared with carbon fiber at temperatures above Tv. CFRV (tensile strength, 570 MPa; modulus, 21 GPa) can be used structural composite material. Additionally, it retains the unique recyclability reprocessability vitrimer. solution-cast reproduced during recycling, similar to original recreated by remolding recovered film. synthesized biobased high-strength facilitate development carbon–fiber-composite materials.
Language: Английский
Citations
21