Tire cords ebonite with

A modified ebonite method was developed [134] to study the interfaces associated with polymer tire cords. Hre cords composed of PET, rayon or nylon fibers are generally bonded to rubber with a resorcinol-formaldehyde-latex (RFL) adhesive. The nature of the interfaces is of interest in tire... 

The reaction medium consists of molten sulfur/accelerator (N,N-dicyclohexyl-2-benzo-thiazolylsulfenamide)/zinc stearate in the weight ratio 90/5/5. Small pieces of the cord are cut from the tire carefully trimming some of the rubber but leaving a thin, undisturbed surface layer. Eight hours are required for the reaction at 120°C. Samples are removed, scraped off and placed in a 120°C oven to remove the excess ebonite. The treated cords are embedded and sectioned with a diamond knife to reveal the interfaces that relate to the adhesive coating and the tire cord adhesion. The fiber-RFL-rubber interfaces are all observed in the tire cord cross section (Fig. 4.14). A more complete description of this type of study is described in Chapter 5. 

A modified ebonite method was developed [113] to study the interfaces associated with polymer tire cords. Tire cords composed of PET, rayon or nylon fibers are generally bonded to rubber with a resorcinol-formaldehyde-latex (RFL) adhesive. The nature of the interfaces are of interest in tire cord studies. OSO4 may be used to stain and harden the RFL, but the soft rubber is not affected by this treatment, and, in fact, it forms a barrier to stain penetration. The ebonite reaction hardens the rubber and hardens and stains the RFL while maintaining the geometrical integrity of the composite. 

---