text: Sulfenamides, e.g. cyclohexylthiophthalimide, are used extensively in the vulcanization of rubber.  The sulfenamides are used to accelerate the process via the transient formation of labile S-N bonds.  The substituents on the sulfenamides determine the point at which they will become active. Temperature dependent activation of sulfenamide accelerants is useful in the vulcanization process because the temperature at which the rubber polymerizes determines the length of the sulfur chains, and properties such as the elasticity of the final product.