High mechanical strength and high dielectric graphene/polyuthane composites healded by near infrared laser

In this work, graphene/polyurethane composites with characteristic of covalently bonding and Diels-Alder (DA) chemistry was developed. Thereinto, graphene was functionalized as filler to enhance mechanical properties and further used as medium for absorbing the power of infrared (IR) laser and transferring it to heat for repairing the composites based on the reversible DA chemistry. Besides, the monodisperse graphene was used as high dielectric material to improve the dielectric properties of the composites. Therefore, the as-prepared graphene/polyurethane composites possess excellent mechanical properties, good dielectric properties and super repairing ability by means of IR laser. All the results indicated that the novel graphene/polyurethane could be considered as the candidate for intelligent components and the areas of encapsulated electronic components.