چكيده به لاتين
Each year, large amounts of elastomeric wastes from automobile industries, especially tires, are discarded and accumulated in inappropriate places, generating environmental, social and economical problems. Tire rubber residues do not decompose easily due to its crosslinked structure (they are not biodegradable) and the presence of stabilizers and other additives. Devulcanization is considered to be the most attractive method of reusing waste tire rubbers. Devulcanization of waste rubbers, is a technique in which energy is provided tothe material in order to destroy, the threedimensional network formed during vulcanization. Microwave devulcanization is currently one of the most promising techniques because of good properties of devulcanized material and the possibility of high productivity. In this thesis, the influence of operating parameters such as time, rubber powder size, stirring speed and change the formulation and the use of chemical agent on devulcanization was investigated. Pyrolysis-FTIR, TGA, and DSC analyzes were used to investigate the devulcanization and chemical changes, and the percentage of devulcanization was obtained by swelling in the toluene and insoluble and soluble fraction by extraction with acetone and toluene. In the end, the optimal samples were revulcanized with the highest percentage of devulcanization and the tensile test was taken from them. In the end, by changing the parameters and using the chemical agent, the percentage of devulcanization improved and increased from 9.51% to 34.85%.
