Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 150, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2021.106598
Keywords
Multifunctional composites; Graphene; Flame/fire retardancy; Fire alarming
Funding
- National Natural Science Foundation of China [51720105012]
- Sichuan University postdoctoral interdisciplinary Innovation Fund
- Fundamental Research Funds for the Central Universities
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A multifunctional polyurethane sponge with excellent flame retardancy and early fire alarming function was prepared through layer-by-layer assembly. It offers ultra-high structural stability during flame treatment and also serves as a stable piezoresistive sensor.
The lightweight materials with good flame retardancy and early fire alarming function can play an effective role in reducing the potential loss caused by fire disasters, which will be highly demanded in the interior decoration of automobile and house. Herein, a multifunctional polyurethane sponge (PUS) was prepared by depositing the flame retardant-modified graphene oxide (FGO) and chitosan-functionalized carbon nanotubes (CNTs) through the layer-by-layer (LBL) assembly. A compact protective barrier formed by combining the chemical char from the catalytic carbonization of PUS and the physical carbon of FGO/CNTs, offering ultra-high structural stability during flame treatment process. The coated sponge showed a short alarming time of similar to 1 s in fire and a early alarming time of similar to 2 s at 500 degrees C, along with a super-long alarming period of 2640 s. Besides, FGO/CNTs@PUS could also acted as a stable piezoresistive sensor to detect the wide range of compressive strain and finger motions.
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