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While thermosets with high mechanical properties and shape memory capabilities have been developed in recent years, two main bottlenecks persist in their intrinsic non-reusability and flammability, especially for those shape memory thermosets used in recycling-required field with high glass transition temperatures (Tg) and thus risky high temperatures to trigger shape recovery. Here we report a new shape memory epoxy thermoset integrated with excellent fire retardancy, recyclability, high mechanical performance, and 100% shape recovery ratio. The shape memory effect of this new thermoset was directly triggered by high-temperature flame for the first time. Furthermore, the survival thermoset can be recycled by a simple solid state recycling method and reused as reinforcing fillers for polyester. The highest recycling efficiency reached 85.4 % and the reinforced composite presented about four times higher storage modulus compared to that of neat sample. This work may open a door for application of thermoset shape memory polymers in many lightweight engineering structures and devices where fire hazard is a concern. The newly proposed concept of flame triggered shape memory effect may also find applications in fire protecting system.
This article was published in the following journal.
Name: ACS applied materials & interfaces
Multiple shape memory thermosets for various engineering applications have been quickly developed in recent years, mainly due to their stable thermomechanical performance, environmental stability, exc...
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