Fabrication of organic P-N aerogel towards simultaneously super thermal insulation, enhanced compressive strength, flame retardancy and smoke suppression for the rigid polyurethane foam

Organic aerogels take the advantages of low density, regulatable flame retardancy, excellent thermal insulation and high mechanical property, which showing an innovative strategy to endow the rigid polyurethane foam with enhanced the flame retardance, mechanical property and thermal insulation performance. Hence, in this work, an innovative strategy was developed to design organic aerogels via the polyvinyl alcohol (PVA) and adenosine triphosphate endowing the RPUF with simultaneously super thermal insulation, enhanced compressive strength , flame retardancy and smoke suppression. The compressive strength of RPUF/PVA-ATP 7 composite was 338 kPa, which was 74.2% higher than that of RPUF. It should be noted that the thermal conductivity of RPUF/PVA-ATP 7 was only 0.020 W/(m·K), which being lower than that of air and showing the characteristic of supper insulating materials. For the RPUF/PVA-ATP 5 and RPUF/PVA-ATP 7 composites, both passed the UL-94V-0 rating with a LOI of 30.0% and 36.5%. Meanwhile, the peak heat release rate (PHRR) and the peak of CO production (PCOP) of RPUF/PVA-ATP 7 composites effectively reduced by 40.7% and 61.6% respectively comparing to that of RPUF. Moreover, it was concluded that the condensed phase mechanism dominated for the RPUF/PVA-ATP 7 composites.