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Hyphenated analysis of high-performance plastic compounds / Author: Lisa Heinschink, BSc
AutorInnenHeinschink, Lisa
Beurteiler / BeurteilerinWallner, Gernot
Betreuer / BetreuerinWallner, Gernot
ErschienenLinz, 2018
UmfangV, 60 Blätter : Illustrationen
HochschulschriftUniversität Linz, Masterarbeit, 2018
URNurn:nbn:at:at-ubl:1-24515 Persistent Identifier (URN)
 Das Werk ist gemäß den "Hinweisen für BenützerInnen" verfügbar
Hyphenated analysis of high-performance plastic compounds [2.8 mb]
Zusammenfassung (Englisch)

Within the present thesis a hyphenated method combining thermogravimetric and infrared-spectroscopic analysis was evaluated using four unfilled high-performance plastics as well as seven compounds. A simultaneous thermal analyzer (STA) and a Fourier-transform infrared (FT - IR) spectrometer were connected via a transfer line. The analysis was performed in inert nitrogen and synthetic air atmosphere to show the influence of the oxidation in the decomposition process. The evaluation of the mass loss was performed by the mass ratio of the offset and onset. The filler fraction was deduced using three different methods: evaluation of the mass loss of the first step of degeneration (m1), the carbonaceous rest of pyrolysis (RoP) and the intensity of specific IR bands (IR). The degradation mechanisms of the unfilled high-performance plastics were outlined with 3D plots of the IR spectra of the generated degradation products over the thermal transition. In nitrogen atmosphere, the unfilled high-performance plastics displayed a one-step degeneration process, except for PEEK, which showed a two-step process related to enhanced release of CO2 around 800 C. The RoP values for this process were ranging from 39 to 49 w% with an exception of PTFE, which was fully decomposing. In synthetic air the investigated high-performance plastics showed a two-step degeneration process, except for PTFE, which decomposed in a one-step degeneration process in both atmospheres. In synthetic air the RoP of the high-performance plastics were ranging from 2 to 17 w% apart from the fully decomposed PTFE, which had no RoP. With the hyphenated analysis a separation and identification of the investigated high-performance plastics and compounds was possible. The degradation and oxidation products were attributed to the specific peaks. In synthetic air the IR spectra were more pronounced than in inert nitrogen atmosphere, which is due to the lesser polarity of the degradation products formed in nitrogen atmosphere. Specific markers were deduced for each high-performance plastic, that help to identify the underlying plastics based on their degradation products. In some PTFE containing grades silicone-based lubricants, that were added for easier processing of PTFE, were identified. With the hyphenated method the manufacturers specifications were qualitatively confirmable, except for one PPS compound with PTFE modification. The calculated filler fraction differed depending on the evaluation method. The attribution of the influence of CaCO3 and the combined influence of carbon fibres (CF) and graphite on the CO2 release was possible. However, a detailed analysis of CF and graphite would require additional methods. The inorganic fillers and PTFE additives could be analysed reliably

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