Time Domain LOW FIELD NMR For Investigating Silane Coupling In A Silica Filled SBR MODEL Tread Compound

The fast decay component of the Hahn Echo relaxation curve is commonly used to measure the total crosslink density in rubber systems.  Reinforcement systems based on carbon black and/or silica are known to influence overall chain mobility, thus affecting the form of the decay curve and providing additional valuable information about chain-filler interactions.

This investigation will look at studying in particular, the chain-silica interactions by time domain NMR for a model silica filled solution SBR compound. The concentration of silane coupling agent will be varied from 0 to 133% of the optimal concentration.    The mixing procedure will be the same for all compounds.  NMR test data in terms of relaxation times will be collected and compared to the compound physical properties and to the tire predictor data gathered by dynamic mechanical analysis