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HINA R&P TECHNOLOGY AND EQUIPMENT
thermal aging model based on fractional strain energy was and peroxide vulcanized EPDM rubber, as commonly used
established to predict the service life of EPDM vulcanized materials for heat-aging applications such as tapes, hoses,
rubber. By testing the tensile properties of samples after automotive parts, and building roofing membranes, are
aging at different temperatures and durations, the fractional characterized by stress-strain properties that prove to be a
strain energy was calculated, and a linear regression equation predictable method for characterizing thermal aging behavior.
between fractional strain energy and aging time was derived Based on this model, the service life of the formulation
to determine the effective rate constant and apparent activation under actual application environmental temperatures can be
energy of the aging reaction. The results confirmed that sulfur predicted, providing a reference for product design.
·42· Vol.52，No.1
