Technical Paper Archive

This site contains all papers presented at Rubber Division, ACS Technical Meetings from 2000-2018. Meetings prior to 2000 are incomplete and papers are added as they are digitized.

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Event: 182nd Technical Meeting
Location: Cincinnati, OH
Date: October 09, 2012
Author: Al Olsen
Paper Number: 11

Price: $20.00

  • Rubber Chemists use the Moving Die Rheometer (hereafter referred to as MDR) to test their rubber compounds. The MDR uses traditional parameters such as minimum torque (ML), maximum torque (MH), one point rise (Tst ), two point rise (Ts2), 50% cure (Tc50) and 90% cure (Tc90) for collecting data off the MDR, Moving Die Rheometer curves. These parameters are based on historically simple methods of pulling data off the curve from the days of ODR tests and computing numbers on paper. These parameters are not based on the actual chemical cure reactions. These parameters are different mixtures of various cure phenomena. For example, the Tc50 is based on the minimum torque, the maximum cure torque (which is a function of test time) and finding the midpoint between these two parameters. The longer the test, the longer the time to 50% cure. The maximum torque is the value during the test, not the true maximum cure state of the rubber material. If the test is short, the maximum torque, MH, is lower than if the test time is long. The current parameters can be difficult to interpret as there are multiple causes for each effect.

    Papers from 182nd Technical Meeting

    Items from 182nd Technical Meeting