Question
Write a note on vulcanization of rubber.
✓
Answer
1. Natural rubber is very soft and brisk. it has a high water absorption capacity and low tensile strength. Its properties can be improved by a process called vulcanization.2. Natural rubber is mixed with 3-5% sulphur and heated at $100-150^O$C causes cross-linking of the cis-1, 4 polyisoprene chains through disulphide (– S – S –) bonds.
3. The physical properties of rubber can be altered by controlling the amount of sulphur that is used for vulcanization. When 3 to 10% sulphur is used the resultant rubber is somewhat harder but flexible.
4. Following properties of rubber $CH_3$
Improved by vulcanization:
Structure of Vulcanized rubber
3. The physical properties of rubber can be altered by controlling the amount of sulphur that is used for vulcanization. When 3 to 10% sulphur is used the resultant rubber is somewhat harder but flexible.
4. Following properties of rubber $CH_3$
Improved by vulcanization:
- Tensile strength
- Elasticity
- Hardness
- Tear strength
- Resistance to solvents
Structure of Vulcanized rubber
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