2. DRAWBACKS OF RUBBER
• It is plastic in nature
• It is weak
• Large water absorption capacity
• Non resistant to non polar solvents
• It perishes due to oxidization
• Swell in organic solvents
• Little durability
3. VULCANIZATION
Discovered by :- Charles Goodyear in 1839
To improve the properties of rubber, it is compounded
with chemicals like sulphur or hydrogen sulphide etc,
i.e- the addition of sulphur
The process consists of heating raw rubber with sulphur
to 100-140 degree Celsius
Thus it stiffness the material by a sort of consequently
preventing intermolecular movement of rubber springs
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5. ADVANTAGES OF VULCANIZATION
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• Have good tensile strength
• Have excellent resilience
• Possess low water absorption tendency
• Higher resistance to oxidation
• Resistant to organic solvent
• Easy to manipulate
• Slight thickness
• Low elasticity
6. NATURAL RUBBER VS
VULCANIZED RUBBER
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