Polybenzoxazine-based covalent adaptable networks: A mini-review

Polymer, Journal Year: 2023, Volume and Issue: 287, P. 126426 - 126426

Published: Oct. 25, 2023

Benzoxazines represent a class of thermoset resins known for their exceptional thermal, fire, and mechanical properties. These find wide applications in various industries, including composites electronic components. However, like conventional thermosets, benzoxazines have limitations terms end-of-life options, typically being landfilled or incinerated. To address this concern, researchers been exploring the incorporation dynamic bonds into structure polybenzoxazines to add functionalities such as reprocessability, self-healing, recycling capabilities, develop polybenzoxazine-based covalent adaptable networks (CANs). This mini-review offers an overview recent endeavors focused on introduction within polybenzoxazine structures. It emphasizes synergies between molecular exchanges, transesterification disulfide metathesis, provides comparative summary properties achieved by materials developed context. By leveraging strengths benzoxazine structures, aims foster exploration development innovative approaches that combine unique CANs, enabling more sustainable environmentally friendly materials.

Language: Английский

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Molecular Simulation of Covalent Adaptable Networks and Vitrimers: A Review

Polymers, Journal Year: 2024, Volume and Issue: 16(10), P. 1373 - 1373

Published: May 11, 2024

Covalent adaptable networks and vitrimers are novel polymers with dynamic reversible bond exchange reactions for crosslinks, enabling them to modulate their properties between those of thermoplastics thermosets. They have been gathering interest as materials recycling self-healing properties. In this review, we discuss different molecular simulation efforts that used over the last decade investigate understand nanoscale behaviors covalent vitrimers. particular, dynamics, Monte Carlo, a hybrid dynamics Carlo approaches model reaction, which is main mechanism since it controls both mechanical rheological behaviors. The techniques presented yield sufficient results structure well responses such networks. benefits each method highlighted. use other tools theoretical models machine learning has included. We noticed, amongst most prominent results, stress relaxes reaction happens, at temperatures higher than glass transition temperature, better more BERs observed. lifetime crosslinks follows, moderate high temperatures, an Arrhenius-like temperature dependence. note modeling certain like melt viscosity topology freezing according behavior ruled by either Williams–Landel–Ferry equation or Arrhenius equation. Discrepancies in dissociative associative discussed. conclude stating material parameters atomistic factors, nanoscale, not yet taken into account lacking current literature.

Language: Английский

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Epoxy Vitrimer Formulation for Resin Transfer Molding: Reactivity, Process, and Material Characterization

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: 6(10), P. 6087 - 6095

Published: May 15, 2024

Initially bound for landfill or incineration due to strong limitations in their repair recycling, thermoset composite materials have recently received considerable attention order improve end-of-life. In this respect, vitrimers appear be a solution of choice, as they possess the capability topological reconfiguration through an associative exchange mechanism, imparting them glass-like properties at high temperatures. However, despite these advances, studies with particular focus on process such pultrusion, impregnation, and resin transfer molding (RTM) remain scarce. work, detailed reactivity study was conducted vitrimer formulation based disulfide chemistry toward RTM process, which includes development time–temperature–transformation (TTT) diagram. On basis, plates were successfully prepared by RTM, yielding thermal mechanical similar reference epoxy resin. Additionally, while exhibiting very competitive properties, resulting demonstrated ability reshaped reprocessed. This work covers formulation, reactivity, implementation into and, ultimately, material characterization.

Language: Английский

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Sustainable adhesives: Exploring boronic ester vitrimers containing lignin microparticles

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 495, P. 153400 - 153400

Published: June 22, 2024

The market of epoxy resin-based adhesives is constantly growing in automotive, electronics and healthcare industries thanks to their unique features such as high bonding strength, durability, corrosion resistance. In this work, alternative sustainable vitrimer adhesives, containing from 20 50 wt% lignin microparticles, were prepared epoxidized linseed oil (ELO) a boronic ester dithiol crosslinker (DBEDT), the absence solvents catalysts. addition unmodified commercial Kraft composites directly influences thermal mechanical properties determines capacity between several adherent substrates, influencing also rewelding potential. lignin-vitrimer corresponding neat matrix exhibited values lap shear strengths range 9 17 MPa, when tested with aluminum, stainless steel wood specimens, good excellent capability. amount microparticles balance cohesive adhesive forces during separation adhered aluminum surfaces eventual joint failure. case lignin, strength remains constant even after four cycles rebonding via compression molding, indicating that best performance associated previous failure, on both sheets surfaces. addition, adhesion was preserved for 83 % initial value 24 h immersed water. Importantly, biodegradability soil seawater enhanced by presence filler. summary, simple preparation strategy bio-based coming two natural sources could pave way green alternatives industrial applications, epoxy-based adhesives.

Language: Английский

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Unraveling the Thermal Stability of Aromatic Disulfide Epoxy Vitrimers: A Comprehensive Study using Principal Component Analysis (PCA)

RSC Applied Polymers, Journal Year: 2024, Volume and Issue: 2(5), P. 826 - 837

Published: Jan. 1, 2024

This study combines 1 H NMR and chemometrics to determine optimal processing conditions for aromatic disulfide-based vitrimers, revealing a correlation between model reactions vitrimer networks.

Language: Английский

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