Surface decoration of Halloysite nanotubes with POSS for fire-safe thermoplastic polyurethane nanocomposites

Article


Wu, Wei, Zhao, Wanjing, Gong, Xianjing, Sun, Qijun, Cao, Xianwu, Su, Yujun, Yu, Bin, Li, Robert K.Y. and Vellaisamy, Roy A.L.. 2022. "Surface decoration of Halloysite nanotubes with POSS for fire-safe thermoplastic polyurethane nanocomposites." Journal of Materials Science and Technology. 101, pp. 107-117. https://doi.org/10.1016/j.jmst.2021.05.060
Article Title

Surface decoration of Halloysite nanotubes with POSS for fire-safe thermoplastic polyurethane nanocomposites

ERA Journal ID4724
Article CategoryArticle
AuthorsWu, Wei, Zhao, Wanjing, Gong, Xianjing, Sun, Qijun, Cao, Xianwu, Su, Yujun, Yu, Bin, Li, Robert K.Y. and Vellaisamy, Roy A.L.
Journal TitleJournal of Materials Science and Technology
Journal Citation101, pp. 107-117
Number of Pages11
Year2022
PublisherElsevier
Place of PublicationChina
ISSN1005-0302
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jmst.2021.05.060
Web Address (URL)https://www.sciencedirect.com/science/article/abs/pii/S1005030221006228
Abstract

Halloysite nanotubes (HNTs) have been considered as a promising flame retardant fillers for polymers. In this work, the polyhedral oligomericsilsesquioxane (POSS) containing amino group was covalently grafted on the surface of HNTs with 3-(2,3-epoxypropoxy)propytrimethoxysilane as a chemical bridge. The POSS modified HNTs (HNTs-POSS) dispersed uniformly in the thermoplastic polyurethane (TPU) matrix and endowed TPU nanocomposites with enhanced tensile properties and fire safety. Cone calorimeter tests revealed that the introduction of 2 wt% HNTs-POSS to TPU matrix remarkably reduced the peak of heat release rate (PHRR) and total heat release (THR) by 60.0% and 18.3%, respectively. In addition, the peak CO production rate and total smoke release (TSR) could be significantly suppressed by the addition of HNTs-POSS. The well dispersed HNTs in combination with the ceramified silicon network from the thermal decomposition of POSS contributed to the formation of a continuous and compact char layer, exhibiting a tortuous effect by inhibiting heat diffusion and evaporation of volatile gaseous. In addition, the released crystal water from HNTs could dilute the combustible volatiles and then decline the combustion intensity. The tensile tests demonstrated that introduction of 2 wt% HNTs-POSS would enhance the maximum stress of TPU nanocomposite with a slight decrease of elongation at break. The combination of HNTs and POSS through the construction of effective interfacial interactions provides a feasible way to effectively enhance the fire safety of TPU nanocomposites without scarifying ductility.

KeywordsThermoplastic polyurethane; Halloysite nanotube; POSS; Flame retardancy; Mechanical property
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Byline AffiliationsCity University of Hong Kong, China
South China University of Technology, China
Kingfa Science and Technology, China
Centre for Future Materials
University of Glasgow, United Kingdom
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