期刊
POLYMERS FOR ADVANCED TECHNOLOGIES
卷 32, 期 5, 页码 2159-2168出版社
WILEY
DOI: 10.1002/pat.5246
关键词
aerogel; cellulose nanofiber; fire alarm; flame retardant; thermal isolation
资金
- National Innovation and Entrepreneurship Training Program for College Students [202010497001]
- National Natural Science Foundation of China [51703175]
This study utilized cellulose nanofiber-based aerogel doped with ammonium polyphosphate and graphene oxide to achieve excellent thermal-insulating and flame-retardant properties. A fire-warning detector was designed to provide the composite aerogel with an ultra-fast fire-response time and durable alarm signal.
Due to the energy-saving demands in chemical industries and building fields, thermal isolation materials (TIMs) are widely used. The general exploitation of combustible TIMs calls for timely fire alerts as well as flame-retardant modifications. This work provides a novel paradigm to address the issues simultaneously by preparing a multifunctional aerogel via a facile and environmentally friendly freeze-drying method. With the doping of ammonium polyphosphate and graphene oxide (GO), cellulose nanofiber-based aerogel exhibits excellent thermal-isolating as well as flame-retardant properties. The composite aerogel displays flameless pyrolysis as well as increased residue char. A fire-warning detector is designed to reliably monitor the early fire. Based on the flame-induced electrical resistance transformation characteristic of GO, it endows the composite aerogel with an ultra-fast fire-response time of similar to 2.6 s and a durable alarm signal. The flame-retardant and fire-alarm mechanisms are concluded. Overall, these results suggest that this composite aerogel has an enticing prospect in chemical industries and high-rise buildings, which may lay the foundation for designing multifunctional TIMs. The modified aerogel broadens its application territory by intrinsic fire-alarm characteristics, which covers the deficiency of delaying reaction as well as restricted application scenarios in traditional fire detectors.
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