Dr. Dmitri Kopeliovich
Vulcanization of rubber is a process of improvement of the rubber elasticity and strength by heating it in the presence of sulfur, which results in three-dimensional cross-linking of the chain rubber molecules (polyisoprene) bonded to each other by sulfur atoms.
There are two general types of rubber:
Vulcanization process was invented by Charles Goodyear in 1839.
Vulcanization technique comprises the following principal stages:
Slow cross-linking starts at this stage. It is neccessary to avoid active vulcanization during mixing, which may cause cracks formation at the molding stage.
Density of cross-links must be controlled in order to prevent formation of brittle rubber.
Properties of rubber improved by vulcanization: