Abstract
It remains very challenging to create porous materials with both good thermal insulation and flame retardancy for construction of energy-saving buildings. Herein, we report the first example of ionic liquid (IL)-based monolithic porous polymers as efficient flame retardant with good thermal insulation, which was synthesized by polymerization of vinyl tetrafluoroborate ionic liquid monomers with polydivinylbenzene (PDVB) as a crosslinker through a facile solvothermal synthesis followed by freeze drying (named as PDVB-BF4ILs). The PDVB-BF4ILs is mainly composed of mesopores with a pore sizes ranging from 8.8 to 20.3 nm. The PDVB-BF4ILs has a decomposition temperature of higher than 320 °C. The PDVB-BF4ILs show high thermal insulation with a low thermal conductivity (0.019W m−1 k−1) in air. Also, the PDVB-BF4ILs possesses excellent flame retardancy with a low peak heat released rate (139.3W g−1). Compared with porous PDVB, the pHRR of PDVB-BF4ILs was reduced by approximately 75%. Torch burn test implies that the PDVB-BF4ILs shows self-extinguishing behavior without generation of any melt dripping, indicating an excellent flame retardancy. Taking advantages of simple fabrication process, easily to be scaled-up, excellent thermal insulation and flame retardancy, such IL-based monolithic porous polymers may have great potential for real applications.
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