Citation

Wei YX, Deng C, Chen H, Wan L, Wei WC, Wang YZ. ACS Appl. Mater. Interfaces 2018; 10(33): 28036-28050.

Copyright

(Copyright © 2018, American Chemical Society)

DOI

10.1021/acsami.8b07629

PMID

30052025

Abstract

It is a huge challenge to achieve the highly efficient fire retardance and meanwhile no any mechanical damage for polymers. In our current research, a novel core-shell titanium dioxide@diphenylphosphinic (TiO2@DPP) nanosphere was first synthesized through a hydrothermal reacting process, and applied in simultaneously enhancing the fire retardance and mechanical properties of polycarbonate (PC). The well-designed TiO2@DPP exhibited significant effect on the combustion performance and mechanical reinforcement of PC. At only 0.10 wt% of TiO2@DPP, the PC/TiO2@DPP passed the UL-94 V-0 rating, and its oxygen index value rose to 29.3%. Moreover, the peak value of heat release rate was remarkably decreased by 34.1% in combustion test, accompanied by the formation of more compacted char layer and the release of more incombustible gas. Equally important another aspect, the PC containing only 0.10 wt% of TiO2@DPP possessed higher elongation at break and higher tensile strength than pure PC, correspondingly increased by 27.7% and 14.7%. The analysis of the flame-retardant mechanism revealed that the improved fire retardance of PC is primarily ascribed to the barrier action of a cross-linking network containing phosphorus and titanium, the dilution of nonflammable gases such as H2O, and the quenching effect of free radicals which are from the phosphorous group in the gas phase. All these experimental results demonstrates that the core-shell hybrid TiO2@DPP may achieve the simultaneous significant improvement of fire retardance and mechanical properties of PC.

Language: en