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-ATP7 composite was 338 kPa, which was 74.2% higher than that of RPUF. It should be noted that the thermal conductivity of RPUF/PVA-ATP7 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-ATP5 and RPUF/PVA-ATP7 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-ATP7 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-ATP7 composites.