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 .