Abstract
Vitrimers are a promising alternative to conventional composite materials as they can be recycled and reshaped but still need additives. Herein, intrinsic flame-retardant phosphorus-containing vitrimers are presented, which were used in composites.
Highlights
Cross-linked-polymer composites based on epoxy resins that are currently on the market cannot be chemically recycled and often show high flammability without flame retardant additives
Poly[1] was successfully recycled, which was proven by dynamic mechanical analysis after compressing the blended flakes
Poly-1 exhibited a clear reduction of the THE by 27% and PHRR by 33% compared to the reference poly-2
Summary
Cross-linked-polymer composites based on epoxy resins that are currently on the market cannot be chemically recycled and often show high flammability without flame retardant additives. We present a phosphonate-based and intrinsic flame-retardant dynamic polymer network based on vinylogous polyurethanes, eliminating the need for additional flame retardant additives. We show their recyclability, use in glass-fiber composites, and study their. Due to the high flammability of epoxy resins, flame retardant additives are required to fulfill current regulatory safety requirements.[2] the extensively used halogenated, mostly brominated, flame retardants are being phased out due to their potential negative environmental impacts and toxicity.[3,4,5,6] halogenated flame retardants are often substituted by phosphorus-based flame retardants. Due to the chemical versatility of phosphorus chemistry and high effectiveness at already low loadings, phosphorus-containing flame retardants gained recently a lot of attention in academia and industry.[6]
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