Alternate Instrumental Methods of Measuring Scorch and Cure Characteristics
(1995) Polymer Testing — Vol. 14, n° 1, p. 45-84 (1995)
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- After the development of the oscillating disk curemeter over 30 years ago, standard conditions for measuring scorch times (time till the onset of vulcanization) were developed. ISO 3417 and ASTM D2084 describe t(s)1 and t(s)2 test parameters which are accepted by the rubber industry as a method for measuring scorch times. t(s)1 is the time until one torque unit rise above minimum torque and t(s)2 is the time until two torque units rise above minimum torque. These parameters are arbitrary and do not measure the 'true' scorch time. Also t(s)1 and t(s)2 may not be an accurate comparison for compounds which differ greatly in their state of cure. Experience has shown that some rotorless curemeter designs are far more sensitive to physicochemical changes occurring during the cure process than the conventional oscillating curemeters. The MDR 2000(R) rotorless curemeter (MDR) and the RPA 2000(TM) Rubber Process Analyzer (RPA) measure subtle changes in viscoelastic properties during the caring process. This paper discusses the feasibility of using the time until the viscous torque (S'') peaks (f??) to more accurately measure the 'true' scorch time. Other techniques for measuring care characteristics are also reviewed for comparison.
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Dick, JS., Pawlowski, H., & Scheers, E. (1995). Alternate Instrumental Methods of Measuring Scorch and Cure Characteristics. Polymer Testing, 14(1), 45-84. https://doi.org/10.1016/0142-9418(95)90615-N (Original work published 1995)