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Polyacrylate Vitrimer Network via In Situ Isocyanide Copolymerization: Synthesis and Molecular Dynamics.
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Researchers created a recyclable polyacrylate vitrimer network via one-step photocopolymerization using isocyanide cross-linkers, demonstrating maintained mechanical performance across three reprocessing cycles and using broadband dielectric spectroscopy to reveal that bond-exchange dynamics underlie both stress relaxation and charge transport in these sustainable polymer networks.
Widespread plastic pollution highlights the urgent need for materials with sustainable end-of-life management. Vitrimers, cross-linked polymers containing dynamic covalent bonds, combine the durability of thermosets with their recyclability. Here, we report a one-step photocopolymerization using multifunctional isocyanides as readily accessible cross-linkers that directly introduce vinylogous urethane-like linkages into polyacrylate networks, structures difficult to obtain via amine-β-ketoester condensation. The resulting materials show good reprocessability, maintaining a comparable mechanical performance after three processing cycles. Broadband dielectric spectroscopy (BDS) reveals that the temperature dependence of the bond-exchange relaxation times evolves from a kink-like response in fresh samples to Arrhenius behavior after annealing, visualizing topological rearrangement and defect healing. A scaling relationship between bond-exchange relaxation and electrical conductivity establishes that the former is the underlying mechanism for charge transport in vitrimers. Furthermore, dipolar intermediates generated during bond exchange increase the dielectric permittivity, providing new insight into designing sustainable dielectric materials.
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Researchers synthesized a biodegradable poly(lactic-co-glycolic acid) network with dynamic chemical bonds that degrade under environmental conditions, making it a candidate to replace microplastic-generating polyolefins in packaging and agriculture. The study characterizes its thermal and mechanical properties for practical applications.
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Scientists have created a new type of plastic that's both durable during use and easy to fully recycle back into its original building blocks, without harsh chemicals — solving a long-standing trade-off where sturdy plastics are usually hard to recycle. This matters because most plastics today break down into microplastics or end up in landfills since true recycling is difficult; this new material could offer a path to truly circular plastics that don't accumulate as pollution, potentially reducing our long-term exposure to microplastics in food, water, and air.
Nanocellulose as a Bio-Based Reinforcement in Vitrimer Nanocomposites: Manufacturing and Mechanical Characterisation
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Researchers synthesized recyclable vitrimer nanocomposites reinforced with cellulose nanofibrils from wood and found that just 0.25 wt% filler increased tensile and flexural strength by up to 21%, while the vitrimer matrix retained reshaping and reprocessing capability — offering a bio-based, low-toxicity path to durable sustainable plastics.
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