Bulg. J. Phys. vol.27 no.S3 (2000), pp. 215-218

Radiation Vulcanization Efficiency Improvement by Addidonal Use of Microwave Energy

D. Martin1, D. Ighigeanu1, H. Iovu2, I. Calinescu2, C. Oproiu1, E. Mateescu1, A. Ighigeanu3, G. Craciun1
1National Institute for Lasers, Plasma and Radiation Physics, Electron Accelerators Laboratory, P.O.Box: MG-36, 111 Atomistilor St., 76900 Bucharest, Romania
2Department of Polymer Science & Composites, Polytechnic University of Bucharest, 149 Calea Victoriei, 71101-Bucharest, Romania
3Institute of Optoelectronics, P.O.Box : MG-22, 111 Atomistilor St., 76900 Bucharest , Romania
Abstract. The comparative results obtained by applying separate electron beam irradiation and simultaneous electron beam and microwave irradiation to vulcanization of rubber mixtures based on natural rubber and polybutadiene rubber with carbon black are presented. The mechanical properties such as 300% modulus, tensile strength and residual elongation of the obtained vulcanized rubbers were determined. In the absence of microwave, electron beam irradiation doses of 200-250 kGy are required in order to obtain a higher vulcanization degree. This irradiation dose and irradiation time were markedly diminished , from 2 to 6 times, by simultaneous electron beam and microwave irradiation. Experiments were carried out using an electron linear accelerator, ALID-7, of 5.5 MeV and 0.7 kW maximum output power and a 2.45 GHz microwave source of 0.85 kW maximum output power.

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