Vulcanisatlon is carried out by adding sulphur( 3-5 %) and zinc oxide to the rubber, and then heating the object at about 110 ° Cfor about 20-30 minutes. Zinc oxide accelerates the rate of vulcanisation. Vulcanisation introduces polysulphide(-S-S-) bonds between the adjacent chains. These crosslinks tend to limit the motion of chains relative to each other.
5. Neoprene
Polymer formed by polymerisation of chloroprene is neoprene or synthetic rubber.
It is used for the manufacturing conveyers belts, gasket and hoses.
6. Buna-N It is a copolymer of buta-I, 3-diene and acrylonitrile. It is formed as follows
Properties and Uses
It is insulator in nature and is used for making conveyor belts and printing rollers.