Two phosphorous-containing flame retardant form a novel intumescent flame-retardant system with polycarbonate

Hexakis(4-nitrophenoxy) cyclotriphosphazene (HNTP) and oligomeric bisphenol A bis(diphenyl phosphate) (BDP), phosphorous-containing flame retardant, were mixed into polycarbonate (PC) together as intumescent flame retardancy (IFR) system. The flame retardancy and thermal decomposition behavior of co...

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Bibliographic Details
Published in:Polymer degradation and stability 2016-12, Vol.134, p.136-143
Main Authors: Yang, Yunyun, Kong, Weibo, Cai, Xufu
Format: Article
Language:English
Subjects:
Bisphenol A
Combustion
Decomposition
Flame retardants
Fourier transforms
Hexakis(4-nitrophenoxy)cyclotriphosphazene(HNTP)
Infrared spectroscopy
Intumescent flame retardant (IFR)
Oligomeric bisphenol A bis(diphenyl phosphate)(BDP)
Phosphorous-containing
Polycarbonate resins
Synergistic effectivity (SE)
Thermal decomposition
Thermal stability
Thermogravimetric analysis
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Summary:Hexakis(4-nitrophenoxy) cyclotriphosphazene (HNTP) and oligomeric bisphenol A bis(diphenyl phosphate) (BDP), phosphorous-containing flame retardant, were mixed into polycarbonate (PC) together as intumescent flame retardancy (IFR) system. The flame retardancy and thermal decomposition behavior of composites were studied with the limiting oxygen index(LOI), UL-94 vertical burning test, microscale combustion calorimeter(MCC) and thermogravimetric analysis(TGA). The results showed the LOI of IFR system increased by 1.68 times compared with pure PC. The addition of HNTP and BDP accelerated the first decomposition peak but weaken the second decomposition peak to improve the flame retardancy of PC. Furthermore, TGA coupled with fourier transform infrared(TGA/FTIR) was used to research the gaseous products. Scanning electron microscopy (SEM) analyses and FTIR spectroscopy were used to study the structure of residual char. The results showed that HNTP and BDP formed continuous bubbles on the surface of PC during burning and exhibited synergistic effects on thermal stability of PC.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2016.09.021