TY - JOUR
T1 - Nanohybrid of Co3O4 Nanoparticles and Polyphosphazene-Decorated Ultra-Thin Boron Nitride Nanosheets for Simultaneous Enhancement in Fire Safety and Smoke Suppression of Thermoplastic Polyurethane
AU - Tong, Yizhang
AU - Wu, Wei
AU - Zhao, Wanjing
AU - Xing, Yurui
AU - Zhang, Hongti
AU - Wang, Cheng
AU - Chen, Timothy B.Y.
AU - Yuen, Anthony C.Y.
AU - Yu, Bin
AU - Cao, Xianwu
AU - Yi, Xiaohong
N1 - Funding Information:
This research was funded by the Guangdong Basic and Applied Basic Research Foundation (2021A1515012425), the National Natural Science Foundation of China (52103029), the International Collaboration Programs of Guangdong Province (2020A0505100010), the Opening Project of Key Laboratory of Polymer Processing Engineering (South China University of Technology), Ministry of Education of China (KFKT1904), Australian Research Council Industrial Training Transformation Centre (IC170100032) and Guangzhou Innovation Leading Team Project (201809010011).
Publisher Copyright:
© 2022 by the authors.
PY - 2022/10
Y1 - 2022/10
N2 - Thermoplastic polyurethane (TPU) is widely used in daily life due to its characteristics of light weight, high impact strength, and compression resistance. However, TPU products are extremely flammable and will generate toxic fumes under fire attack, threatening human life and safety. In this article, a nanohybrid flame retardant was designed for the fire safety of TPU. Herein, Co3O4 was anchored on the surface of exfoliated ultra-thin boron nitride nanosheets (BNNO@Co3O4) via coprecipitation and subsequent calcination. Then, a polyphosphazene (PPZ) layer was coated onto BNNO@Co3O4 by high temperature polymerization to generate a nanohybrid flame retardant named BNNO@Co3O4@PPZ. The cone calorimeter results exhibited that the heat release and smoke production during TPU combustion were remarkably restrained after the incorporation of the nanohybrid flame retardant. Compared with pure TPU, the peak heat release rate (PHRR) decreased by 44.1%, the peak smoke production rate (PSPR) decreased by 51.2%, and the peak CO production rate (PCOPR) decreased by 72.5%. Based on the analysis of carbon residues after combustion, the significant improvement in fire resistance of TPU by BNNO@Co3O4@PPZ was attributed to the combination of quenching effect, catalytic carbonization effect, and barrier effect. In addition, the intrinsic mechanical properties of TPU were well maintained due to the existence of the PPZ organic layer.
AB - Thermoplastic polyurethane (TPU) is widely used in daily life due to its characteristics of light weight, high impact strength, and compression resistance. However, TPU products are extremely flammable and will generate toxic fumes under fire attack, threatening human life and safety. In this article, a nanohybrid flame retardant was designed for the fire safety of TPU. Herein, Co3O4 was anchored on the surface of exfoliated ultra-thin boron nitride nanosheets (BNNO@Co3O4) via coprecipitation and subsequent calcination. Then, a polyphosphazene (PPZ) layer was coated onto BNNO@Co3O4 by high temperature polymerization to generate a nanohybrid flame retardant named BNNO@Co3O4@PPZ. The cone calorimeter results exhibited that the heat release and smoke production during TPU combustion were remarkably restrained after the incorporation of the nanohybrid flame retardant. Compared with pure TPU, the peak heat release rate (PHRR) decreased by 44.1%, the peak smoke production rate (PSPR) decreased by 51.2%, and the peak CO production rate (PCOPR) decreased by 72.5%. Based on the analysis of carbon residues after combustion, the significant improvement in fire resistance of TPU by BNNO@Co3O4@PPZ was attributed to the combination of quenching effect, catalytic carbonization effect, and barrier effect. In addition, the intrinsic mechanical properties of TPU were well maintained due to the existence of the PPZ organic layer.
KW - boron nitride
KW - CoO
KW - fire safety
KW - mechanical property
KW - polyphosphazene
KW - thermoplastic polyurethane
UR - http://www.scopus.com/inward/record.url?scp=85140893970&partnerID=8YFLogxK
U2 - 10.3390/polym14204341
DO - 10.3390/polym14204341
M3 - Journal article
AN - SCOPUS:85140893970
SN - 2073-4360
VL - 14
JO - Polymers
JF - Polymers
IS - 20
M1 - 4341
ER -