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What is the difference between Buna-N an...

What is the difference between Buna-N and Buna-S.

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Both are copolymers. Buna-N is a copolymer of 1,3-butadiene and acrylontrile whereas Buna-S is a copolymer of 1,3-butadiene and styrene.
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Buna - S is a

Rubber is a naturally occurring polymer, which is a linear polymer of isoprene. It can be easily deformed but regains its original shape after the stress is relieved. The properties of natural rubber can be modified and improved by process of vulcanization. It is mixed with 3 to 5% sulphur and heated at 373-423 K. This forms cross links through disulphide bonds (-S-S-) , which make rubber hard, tough with greater tensile strength. There are many different formulations of synthetic rubbers. These are copolymers in which one of the monomer is isoprene. Some common examples are neoprene rubber, Buna-S, Buna-N, etc. What does the letter 'N' stands for in synthetic rubber Buna-N.

NCERT-POLYMERS-Exercise
  1. Write the names of monomers of the following polymers :

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  2. Classify the following as addition and condensation polymers : Teryl...

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  3. What is the difference between Buna-N and Buna-S.

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  4. Arrangement the following polymers in increasing order of their interm...

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  5. Explain the terms polymer and monomer.

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  6. What are natural and synthetic polymers ? Give two examples of each ty...

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  7. Distinguish between the terms homopolymer and copolymer and give an ex...

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  8. How do you explain the functionality of a monomer?

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  9. Define the term polymersation.

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  10. Is(NH-CHR-CO)(n)a homopolymer or copolymer?

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  11. In which classes, the polymers are classified on the basis of molecula...

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  12. How can you differentiate between addition and condensation polymerisa...

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  13. Explain the term copolymersation and give two examples.

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  14. Write the free radical mechanism for the polymersation of ethene.

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  15. Define thermoplastics and thermosetting polymers with two examples of ...

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  16. Write the monomers used for getting the following polymers. (i) Poly...

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  17. Write the name and structure of one of the common initiators used in f...

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  18. How does the presence of double bonds in rubber molecules influence th...

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  19. Discuss the main purpose of vulcanisation of rubber.

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  20. Which are the monomeric repeating units of Nylon-6 and Nylon-6,6 ?

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