Study of the Viscosity of Natural and Synthetic Polyisoprene Rubbers in Polar and Nonpolar Solvents Authors: Mustafa M. F. Al-Jarraha; Amar H. Al-Dujailib; Emad T. B. Al-Takrityb Abstract Currently in the rubber industry, natural occurring rubber (NR) obtained from Hevea trees and synthetic polyisoprene (IR) produced industrially by alkyllithium or Ziegler- Natta methods, are utilized in the manufacture of tires. In fact, high cis-1, Cpolyisoprene is also used in tire products, molded and mechanical goods, rubber bands, bottles, nipples, footwear and sporting goods, gloves, sealants, and caulking. Such similar applications of NR and IR rubbers are due to their close resemblance in structure and properties (1).
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