Vulcanised Rubber

What is the function of sulphur cross-link?

• Prevents rubber polymer from sliding when it is streched to return to original shape

• Allow the rubber polymer to slide when it is strech

• Prevent the rubber polymer to stay in its original structure when strech

What is the characteristics of the natural rubber when exposed to the air for a long period time?

• hard and easily to oxidized

• soft and difficult to oxidized

• soft and easily to oxidized

• hard and difficult to oxidized

What is a difference between vulcunised rubber and unvulcunised rubber ?

• Vulcunised rubber are more elasticity than unvulcunised rubber

• Vulcunised rubber are less resistant to high heat while unvulcunised rubber are resistant to high heat

• Vulcunised rubber are easier to be oxidised while unvulcunised rubber more resistant towards oxidation

• The hardness of vulcunised rubber are soft while the hardness of unvulcunised rubber are hard

Choose the correct answer about alternative vulcanisation

• Peroxide and Irradiation only

• Metal oxide only

• Peroxide and Metal oxide only

• Peroxide , irradiation and metal oxide

What is the main purpose of adding carbon black to rubber?

• To increase the hardness of rubber

• To improve the elasticity of rubber

• To enhance the resistance to heat and abrasion

• To reduce the flexibility of rubber

How does the process of vulcanization affect the properties of rubber?

• It makes the rubber softer and less durable

• It increases the strength and elasticity of rubber

• It decreases the resistance to chemicals in rubber

• It has no impact on the properties of rubber

What is the significance of antioxidants in rubber manufacturing?

• Antioxidants help in increasing the hardness of rubber

• Antioxidants prevent rubber from degrading due to oxidation

• Antioxidants reduce the elasticity of rubber

• Antioxidants make rubber more prone to heat damage

What happen to the double bond during vulcanization process?

• The single bond between carbons found in rubber molecules will react with sulphur cross-links .

• The double bond between carbons found in rubber molecules will react with sulphur cross-links .

• The triple bond between carbons found in rubber molecules will react with sulphur cross-links .

• The double bond between carbons found in rubber molecules will react with carbon cross-links .

What are the properties of vulcanised rubber which caused it to be suitable for manufacturing aircraft

tyres?

• Lighter than unvulcanised rubber

• More elastic than unvulcanised rubber

• Can withstand high temperatures

• Resistance to oxidation

What is needed to break the linkage?

• Low heat energy

• High heat energy

• Less kinetic energy

• Faster kinetic energy