A DOPO-Based Compound Containing Aminophenyl Silicone Oil for Reducing Fire Hazards of Polycarbonate

Abstract

A novel P/N/Si-containing flame retardant (marked as DASO) was synthesized through an Atherton–Todd reaction between 9,10-dihydro-9-oxa-10-phospha-phenanthrene-10-oxide and aminophenyl silicone oil, and further used for reducing fire hazards of polycarbonate (PC). The chemical structure of DASO was verified via FTIR, 1H, and 31P NMR. Upon the incorporation of 2 wt% DASO, the FRPC composite achieved a high limiting oxygen index (LOI) of 32.2% and a desired UL-94 V-0 rating. In this case, the peak heat release rate (PHRR) and total smoke production (TSP) were reduced by 26% and 44% as compared with the pure PC, respectively. The improved fire safety contributed to the flame retardant roles of DASO in both the condensed phase and gas phase. The presence of DASO promoted the formation of dense and highly graphited char layer in the condensed phase, and released non-combustible gases and phosphorus-containing radicals in the gas phase. Furthermore, the FRPC composites displayed comparable elongation at break but a slightly reduced tensile and impact strength.

Varnish Formation and Removal in Lubrication Systems: A Review

“…As the oxidation increases, the absorbance peaks increase. Additionally, phenol inhibitors that are used as antioxidants in the oil show changes in their observed peaks [ 29 , 54 , 55 , 56 , 57 ].…”

A nitrogen‐rich DOPO‐based phosphoramide for improving the fire resistance of polycarbonate with comparable mechanical property

“…As a kind of phosphorus‐containing compound, 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO) has advantages such as high thermal stability, better antioxidant and hydrolysis resistance 26 . Especially, other flame retardant elements can be integrated into its molecular structure due to the high reactivity of the PH bond, many DOPO‐based derivatives containing other flame retardant element were accordingly synthesized and adopted to enhance the flame resistance of different polymer matrices (polyamide, 27,28 epoxy resin, 29,30 PC, 31–33 etc.). Recently, a series of organophosphorous compounds with nitrogen‐containing heterocycles have become great potential flame retardants due to their simple synthesis route, high thermal stability, good char‐formation and free radical quenching capacity 34–36 .…”