The TGA weight change curve is demonstrated in Figure 1. The first weight-loss step is definitely the volatilization followed by An important decomposition stage. The by-product of weight adjust curve in green demonstrates a peak exactly where the height max is at 427.seventy one ˚C. The MS information is gathered all through the entire TGA experiment. Ion currents and TGA mass reduction are plotted for a function of temperature (see Figure two). It is necessary to take into account that the items of the TGA test are Typically decomposition products and solutions, and that's real in these experiments also. Thus, the aim is to comprehend the thermal degradation solutions of nylon sixty six. TGA-MS continually displays the decomposition off gases as a perform of your time and temperature. The degradation system in the polymer molecules breaking within the C-N bond creates more compact polymer molecules Along with the same unit of bicarbonyl polymethylene fragments plus the fragments will break down into carbon dioxide, carbon monoxide, water, and hydrocarbons [5].
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One advantage of making use of GC/MS is its capacity to different intricate mixtures that is perfect for evolved gas Examination employing TGA. A GC/MS scan was performed over the GC/MS unit. A TGA examination was programed to operate to 437 °C wherever an injection of your off gasses was done for your GC/MS Assessment.
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The GC/MS chromatogram is offered in Determine eight with six peaks indicating 6 probable molecules. At the peak max of each labeled peak, There is certainly an involved mass spectrum and it is plotted in Determine nine. The related MS spectrum offers a specific construction of one molecule. This gives more precise library search engine results in comparison to TGA-MS. Just about every MS spectrum in Determine 9 is supplied with a best matched chemical construction with tga66 the library. The constructions received from the GC/MS experiment agree quite perfectly Using the TGA-MS and TGA-FTIR benefits with yet another chemical separation at the provided temperature.
TGA-MS delivers A fast study on volatiles and decomposition method to identify little molecules and certain ion fragments. TGA-FTIR is the best method to determine particular functional groups. TGA-GC/MS permits the separation of a combination of molecules That always evolve concurrently for the duration of decompositions. Combining diverse tactics collectively aids realize the thermal degradation of components much better and uncover the chemical structures of your off-gas products and solutions.
TGA-FTIR spectra had been recorded during the TGA take a look at like a function of your time and stored within an array as the Gram Schmidt file at Just about every info point
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