Flame‐retardant behavior of a phosphorus/silicon compound on polycarbonate

Abstract

A phosphorus/silicon flame retardant, MVC-DOPO, was synthesized from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and 2,4,6,4,6, via addition reaction. Its flame-retardant effect on polycarbonate (PC) was investigated. The phosphorus/silicon flame retardant increased the limited oxygen index and UL-94 rating and reduced the heat release rate and total heat release of DOPO-MVC/PC composites during combustion, indicating the excellent flame-retardant effect of MVC-DOPO on PC. MVC-DOPO inhibited the burning intensity of PC material in the gaseous phase and promoted the formation of a more viscous residue in the condensed phase. Through releasing phosphorus-containing pieces and phenoxy radicals from the phosphaphenanthrene group, MVC-DOPO quenched the combustion chain reaction in the gaseous phase; through promoting formation of a more viscous residue and a dense char layer from the main actions of the cyclotetrasiloxane group, MVC-DOPO reduced fuel release and generated a barrier effect in the condensed phase. Hence, MVC-DOPO effectively exerted a flame-retardant effect on PC material in both the gaseous and condensed phases during combustion. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45815.

Synthesis of DOPO‐g‐GPTS modified wood fiber and its effects on the properties of composite phenolic foams

“…In addition, the protons of phenyl group (7.33–8.66 ppm) appeared in the spectrum of DOPO‐g‐GPTS. These results supported that the reaction occurred between DOPO and GPTS …”

Synthesis of a novel modified chitosan as an intumescent flame retardant for epoxy resin

“…The peak at 899 cm −1 reflects the substituent benzene or triazine. It is the highest at 300°C, indicating that the benzene and triazine rings appeared in the volatile gas at 300°C (11,62,63). Multiple peaks (1,300-2,000 cm −1 ) reflected the alkyl, benzyl, melamine, etc.…”

Synthesis of a novel polyphosphazene/triazine bi‐group flame retardant in situ doping nano zinc oxide and its application in poly (lactic acid) resin

“…From the spectrum, the two typical chemicals shifted at σ = 163.41 ppm and σ = 70.52 ppm were assigned to carbon atoms in the triazine ring. The chemicals shifted at 40.07, 22.15, and 12.13 ppm were attributed to the carbon atoms of the ethylenediamine, N―CH 2 ―C, and C―CH 2 ―Si groups from γ‐aminopropyltriethoxy silane, respectively, which showed chlorine atoms in triazine ring were substituted by ethylenediamine and KH‐550 group mostly …”

“…γ-aminopropyltriethoxy silane, respectively, which showed chlorine atoms in triazine ring were substituted by ethylenediamine and KH-550 group mostly. [37][38][39] To further characterized the chemical structure of A4-d-ZnO, XPS spectrogram was used to investigate the atom content of A4-d-ZnO.…”