Vulcanization - The chemical
reaction which induces extensive changes in the physical
properties of a rubber and which is brought about by
reacting the rubber with sulphur and/or other suitable
agents. The changes in physical properties include decreased
plastic flow, reduced surface tackiness, increased elasticity,
much greater tensile strength, and considerably less
solubility. More recently, certain thermoplastics, e.g.,
polyethylene, have been formulated to be vulcanizable.
Cross-linking is encouraged, thereby giving resistance
to deformation of flow above the melting point.
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