Electron‐beam irradiated ceramizable‐silicone‐rubber‐composites containing allyl‐functionalized cyclophosphazene

In the current study, the ceramifiable‐silicone‐rubber‐composites (CSRs) containing allyl‐functionalized cyclophosphazene (CP‐Allyl) were prepared for studying as novel fire‐resistant insulating materials. Electron‐beam (EB) irradiation was applied to obtain the cross‐linked networks, and the gel content of 98.8% could be achieved at an irradiation dose of 120 kGy. The thermal, mechanical, flame retardancy and insulation properties were well investigated, and it was found that the involvement of CP‐Allyl could have a great influence on the properties. The tensile stress of the EB‐irradiated CP‐Allyl containing composite reached 5.2 MPa, and its limiting oxygen index was up to 32.4%. After ablation at 700–1000°C, it was observed that the shapes of the CSR samples could be well maintained, and the hard and integrated ceramic phases were formed. All the studies indicate that these CSRs may be the promising insulating materials for wires and cables.