Abstract
The surface of char black recovered from scrap tires by pyrolysis is made of glassy resious material from elastomers and the carbon black particles therein are agglomerated with each other. When the char black is mixed with rubbers, the interaction of char black with rubber molecules and the degree of dispersion of char black within the mixture are influenced by the structure of the char black. Vulcanizates filled with char black show low degree of reinforcement, low fracture characteristics, and retain elastic properties up to high filler concentration.
The properties of recovered char black may be characterized by three basic properties, namely the chemical and physical properties of Cα-phase formed at the surface of the char and the nature of the agglomeration of the char black. These characteristics are affected by the condition of the pyrolysis. Therefore, it is necessary to study these properties by various methods in order to utilize the recovered char black effectively. The most important problem is to develop a new evaluation technique for the recycled material besides the existing methods for simple materials since the recycled material forms a complex multicomponent system.
