Synthesis And Properties Of Aromatic Sulfonate Flame Retardant And Research Of Its Flame Retardancy Effect On PC/SFR

Polycarbonate (PC) has a wide range of application for its excellent performance, such asoutstanding electrical properties, excellent mechanical properties and high glass transitiontemperature. However, pure PC shows unsatisfactory flame retardancy during combustion,only limiting oxygen index (LOI) of21~24%and UL-94V-2rating are achieved, whichrestrict its application in some important fields, particularly in electric or electronic industries,automobiles, and construction.Moreover, together with environmental considerations studies have been diverted to theflame retardants free of bromine and chlorine. The organic aromatic-sulphate flame retardantshave drawn people’s attention for its high efficiency with low loading and environmentalfriendliness.Two SFRs were synthesized using Cyanuric chloride, Sodium4-hydroxybenzenesulfonate,2-(methylamino) ethanol and phosphorus oxychloride as raw materials in this thesis, theirchemical structures were confirmed by FTIR, ESI-MS, EA and1H-NMR. The thermalstability of the SFRs were studied by the thermal gravimetrical analysis (TGA) under air andargon atmosphere.Two SFRs were blended with PC to prepare a series of flame retardant PC/SFR.Flammability and thermal behaviors of PC/SFR systems were estimated by limited oxygenindex (LOI), vertical burning test (UL-94) and thermogravimetric analysis (TGA). Themechanical properties were further obtained by flexural, tensile and impact test. The resultsshowed that the LOI values significantly increased with the dosage of SFRs range from0to0.08%. The thermal degradation temperature of PC was decreased, but the char residueschanged unobviously and the UL-94rating of those hybrids achieved V-0. The izod impact strength of those hybrids decreased with the increase usage of the SFRs. With the increaseaddition of the SFRs, the curve of flexural strength and tensile strength of the PC/SFR systemincrease firstly and then flattens, and the maximum strength was achieved as the dosage of theSFRs was0.1%. Thermogravimetric analysis (TGA) indicated that the combination decreasedthe activation energy (E) of PC degradation and elevated the thermal degradation rate of PC toensure the formation of an insulating carbon layer.