Design,Structure And Performance Of Silicone/Graphene Nanocomposites And Its Multi-functional Application

Graphene,a single lawyer crystal composed by sp²carbon atom,has exceptional mechanical,electrical and thermal properties owing to its unique?-?stack,which shows a ideal reinforcing and functional fillers for polymeric materials.Silicone is constructedby Si-O-Si skeleton,showing heat-resisting,anti-ageingand physiologically inert properties,which has been applied in many filed e.g.aviation,appliances,medical and sensor,etc.As a result,it is promising to tailor the complicated interactions between silicone molecule and nanofiller and thus fabricate silicone nanocomposites with excellent mechanical,electrical and flame-retardant properties via constructing the special morphology.In this paper,we use and tune the interaction between the silicone matrix and the nanofiller and systematically investigatethedesign,structureandperformanceofsilicone/graphene nanocomposites and its multi-functional application,including:?1?Constructing the silane modified 3D graphene structure on the porous PU skeleton and filling into epoxy resin,turning and improving the interface interaction between porous PU and epoxy resin by silane molecular and graphene.The results shows that silane modified graphene effectively compensate the stress loss of epoxy-PU composites and enhance both toughness and thermal stability.we analysis the resistance ability to crack growth of different interface by fracture surface,reveal the fracture failure mechanism.?2?Building a 3D structure on the porous PU skeleton by Fe₃O₄modified graphene oxide wide ribbon via a facile dip-coating process,then filling into silicon rubber matrix,producing a high elasticity,conducting and magnetic nanocomposites.Invesgating the electrical change at different tensile and compressive strain,provide an ideal candidates for high sensitivity strain sensor application.?3?Producing a new strategy to prepare environmentally friendly flame-retardant silane modified graphene oxide paper,which shows excellent flame retardant performance at low filler content?⁵ wt%?,exhibit sensitive and fast response to resistance variation as a fire detection and early alarm sensor since its alarming after2-3s at flame environment.Notably,the thiolation silane further improving sensitivity to hightemperature response,shows a potential application in fire prevention of harsh environment?e.g.apparatus short-circuit?.