Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 325, Issue -, Pages 327-339Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.11.057
Keywords
Polyphosphazene nanotubes; Flame retardant; Nanocomposites; Toxicity suppression; Fire hazard
Categories
Funding
- National Key Research and Development Program of China [2016YFC0802802]
- National Natural Science Foundation of China [21604081, 21374111]
- Fundamental Research Funds for the Central Universities [WK2320000032]
- Research Grant Council of the Hong Kong Special Administrative Region, China [CityU 11215314, T32-101/15-R]
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The structure of polyphosphazene nanotubes (PZS) is similar to that of carbon nanotubes (CNTs) before modification. For applications of CNTs in polymer composites, surface wrapping is an economically attractive route to achieve functionalized nanotubes. Based on this idea, functionalized polyphosphazene nanotubes (FR@PZS) wrapped with a cross-linked DOPO-based flame retardant (FR) were synthesized via one-step strategy and well characterized. Then, the obtained FR@PZS was introduced into epoxy resin (EP) to investigate flame retardancy and smoke toxicity suppression performance. Thermogravimetric analysis indicated that FR@PZS significantly enhanced the thermal stability of EP composites. Cone calorimeter results revealed that incorporation of FR@PZS obviously improved flame retardant performance of EP, for example, 46.0% decrease in peak heat release rate and 27.1% reduction in total heat release were observed in the case of epoxy composite with 3 wt% FR@PZS. The evolution of toxic CO and other volatile products from the EP decomposition was significantly suppressed after the introduction of FR@PZS, Therefore, the smoke toxicity associates with burning EP was reduced. The presence of both PZS and a DOPO-based flame retardant was probably responsible for this substantial diminishment of fire hazard. (C) 2016 Elsevier B.V. All rights reserved.
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