Why sulphur is used as universal vulcanizing agent?
[3 marks]Differentiate the vulcanized rubber and unvulcanized rubber.
[4 marks]Discuss in detail about the allotropic forms of sulphur.
[7 marks]List major components of structure of rubber vulcanizate.
[3 marks]Write a short note on vulcanization conditions.
[4 marks]Discuss in detail about the vulcanization of thick rubber articles.
[7 marks]Discuss in detail about the limitations of vulcanization temperature.
What do you mean by co-agent? Also give it’s examples.
[3 marks]Write a short note on resin cure.
[4 marks]Discuss in detail about the sulphenamide accelerators.
[7 marks]Give classification of peroxide as a vulcanizing agent.
[3 marks]Explain the vulcanization of rubber by metal oxide with suitable examples.
[4 marks]Discuss in detail about thiourea accelerators.
[7 marks]What do you mean by ‘ballotini’? Also give it’s practical significance.
[3 marks]Write down advantages and disadvantages of steam vulcanization.
[4 marks]Explain effect of crosslink type and structure on the given properties of vulcanizate:(i)Tensile Strength(ii) Modulus
[7 marks]Which different phases are observed during free heating?
[3 marks]Write a short note on cold cure.
[4 marks]Explain effect of crosslink type and structure on given properties of vulcanizate:
[7 marks]Dynamic Properties (ii) Ageing
[ marks]What do you mean by pressurized vulcanization technique? List the products which are cured by this technique.
[3 marks]Explain effect of compounding on microwave vulcanization technique.
[4 marks]Discuss in detail about the molten salt batch technique. OR8
[7 marks]What do you mean by pressure less vulcanization technique? List the products which are cured by this technique.
[3 marks]Explain the principle of ultrasonic vulcanization technique.
[4 marks]Discuss in detail about vulcanization in water. ***********************\
[7 marks]