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- W1983134950 abstract "Abstract Thermal stability of ethylene–propylene copolymers (EPDM and EPR) is evaluated by isothermal and isobaric determinations of oxygen uptake. Three temperatures (170°C, 185°C and 195°C) were used for all sets of experiments. Two grades of material state: (a) purified by precipitation; and (b) as they were delivered by the manufacturer, were tested. The presence of ethylidene norbornene in the molecular structure of EPDM increased the rate of oxidation. The existence of low amounts of antioxidant in the unpurified materials extends their shelf life. Kinetic parameters were calculated starting from the rate values measured in the propagation stage of oxidation. Change in free energy was evaluated for better information on the oxidation process. The differences in the shape of ΔG curves can be used to explain behaviour of materials under oxidation. Some advantages of the oxygen uptake procedure for material characterization are introduced." @default.
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- W1983134950 date "1998-02-01" @default.
- W1983134950 modified "2023-10-18" @default.
- W1983134950 title "Thermal strength of ethylene–propylene rubbers" @default.
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- W1983134950 doi "https://doi.org/10.1016/s0142-9418(97)00023-8" @default.
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