Rubber is vulcanized to form

Options

A. sulphide and disulphide cross-links between the polymer chains ot provide sufficient rigidity that makes rubber more elastic
B. limitted cross-link (by controlled vulcanization) to make rubber more elastic
C. extensive cross-linkes (by extensive vulcanization) to make rubber highly resistance to wear and abrasion
D. All of these

Answer

D

Explanation

The elasticity of rubber results from is long, coiled polymer chains. When we starch a piece of rubber, the long coils unwind. When we let go, the molecules move bac to roughly their original positions. Actually the molecular strand do move relative one another, which accounts for ubber's pliability and taciness. Early rubber goods were sticky in the summer and brittle in the winter. In 1839, Charles Goodyear discovered that crude rubber heated with sulphur remained elastic but lacked these undesirable characheristics.
Goodyear's process, called vulcanization, results in cross-linking of the polymer chain, which anchors them relative to one another.