Browsing by Author "Bishop, D. P."
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Item Open Access Combined pyrolysis and radiochemical gas chromatography for studying the thermal degradation of polymers(College of Aeronautics, 1968-11) Bishop, D. P.; Moffitt, B. R.; Smith, D. A.Pyrolysis gas chromatography and radioactive tracer techniques have been used independently to study the thermal degradation of polymers. In these laboratories the two techniques have been combined to elucidate some of the mechanisms of the thermal degradation of epoxy resins and polyimides. This paper describes the apparatus developed for this work.Item Open Access The pyrolytic degradation of epoxy resins in nitrogen at 400 to 700 degrees C(College of Aeronautics, 1969-03) Bishop, D. P.; Smith, D. A.The thermal degradation of a bisphenol-A based epoxy resin (EP 274) cured with 4,4’ -diaminodiphenyl methane (DDM) and with phthalic anhydride (PA) was studied using pyrolysis gas chromatography. Conclusive evidence for some of the degradation mechanisms of these resins was obtained by pyrolysing samples containing various 14C labelled groups and analysing the products using a combined gas chromatography and radiochemical technique.Item Open Access The thermal degradation of aromatic polyimides in nitrogen at 700 degrees C(College of Aeronautics, 1969-03) Bishop, D. P.; Smith, D. A.The thermal degradation of aromatic polyimides in nitrogen at 700°C was studied using pyrolysis gas chromatography, infra red spectroscopy, and radiochemical techniques. Degradation medaanisms were postulated to account for the breakdown products found. Particular attention was paid to the ratio of CO2/C0 evolved during pyrolysis and this was found to vary with the moisture content of the polyimide and with the pyrolysis temperature.Item Open Access The thermal degradation of epoxy resins(College of Aeronautics, 1966-10) Bishop, D. P.Item Open Access The thermal degradation of epoxy resins (5)(College of Aeronautics, 1968-08) Bishop, D. P.A summary of work carried out between March 1968 and August 1968 on the resin hardener systems DDIVEP274, PA/EP274, LY558/HT973, EP274/Synolide 960, and CY175/HT907/DY065.Item Open Access The thermal degradation of epoxy resins 3: the thermal degradation of polypyromellitimides 1(College of Aeronautics, 1967-08) Bishop, D. P.Item Open Access The thermal degradation of epoxy resins 4: the thermal degradation of polypyromellitimides 2(College of Aeronautics, 1968-03) Bishop, D. P.A summary of work carried out between 1st September, 1967 and 1st March, 1963 on the thermal degradation of the resin hardener systems DEM/EP274, DDM/KOPDX171, PA/EP274, PA/KOPDX171, THPA/EP274, PMDA/EP274.Item Open Access The thermal degradation of epoxy resins II(College of Aeronautics, 1967-03) Bishop, D. P.