Vulcanization of Nanocomposite Tire Innerliner Compounds and Permeability

Nanocomposite technology offers the potential to provide a platform for the next incremental improvement in tire performance. Tire innerliners based on nanocomposites may allow liner gauge adjustments and permeability reductions with potential improvements in tire casing durability and, for example, reductions in truck fleet tire casing attrition rates. Nanocomposites based on brominated isobutylene p-methylstyrene copolymers with organically modified layered silicates enable permeability reductions not possible with conventional halobutyl elastomers and filler systems. In order to achieve the best performance of a nanocomposite formulation, the vulcanization system can be of considerable importance. Optimized cure systems will help in achieving good adhesion to the adjacent tire casing components, attainment of the highest possible degree of nano-clay exfoliation, and in turn, the lowest permeability. It can also influence other parameters such as fatigue and cut growth resistance and viscosity. This paper is part of an on-going study considering a selection of parameters important in developing an industrial nanocomposite innerliner formulation that will function efficiently in a radial tire.