Analysis of PTFE Coating for Its Pyrolytic Products by Pyrolysis-GC-MS

The pyrolytic properties of PTFE coating were studied by the method of pyrolysis-GC-MS.Tubular pyrolytic furnace and steel capillary column were used,and the released gases were analyzed by staged pyrolysis according to the complexity of the sample.Chromatograms of the pyrolytic products during different pyrolytic stages were obtained.It was found that pyrolytic products obtained in the range of 100-300 ℃ were mainly 1,4-dimethyl-2,5-dieahyl-benzene,isopropoxide aniline and bisphenol A;pyrolytic products in the range of 300-380 ℃ were mainly styrene,α-methyl styrene and 4,4′-dimethylaniline;and pyrolytic products in the range of 380-460 ℃ were mainly phenol,aniline,4-aminotoluene and diphenyl ether;only tetrafluoroethylene was found in the range of 460-600 ℃.