Stress Relaxation Behavior of Ethylene Propylene-Hexadiene Terpolymers
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Abstract 1. The stress relaxation behavior of E/P/hexadiene polymer over wide temperature [Tg to (Tg+140°C)] and composition (molar E/P = 1.7 to 4.4) ranges is described. 2. Although Tg of the polymers is essentially constant (− 60° C), the onset temperature for rubbery flow characterized by an abrupt change in the rate of stress relaxation is highly dependent upon composition. It increases to a higher temperature as the ethylene content is increased. It is also affected by the catalysts used for polymer synthesis. 3. The time-temperature shift factor for one sample was found to follow the WLF equation over the temperature range from − 50° C to 0° C.
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