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Define thermoplastics and thermosetting ...

Define thermoplastics and thermosetting polymers with two examples of each.

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Thermoplastics are the polymers which can be easily softened repeatedly on heating and hardened on cooling. Therefore, it can be used again and again. For example,
(i) Polythene (ii) Polyvinyl chloride
Thermosetting polymers are those which undergo permanent change on heating. They become hard and infusible on heating and cannot be softened again. For example,
(i) Bakelite (ii) Melamine formaldehyde.
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MODERN PUBLICATION-POLYMERS-NCERT FILE (NCERT)(Textbook Exercises)
  1. Explain the terms polymer and monomer.

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

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

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

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  5. Define the term polymersation.

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

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

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

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  9. Explain the term copolymersation and give two examples.

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

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

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  12. Write the monomers used for getting the following polymers. (i)Polyv...

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

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

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  15. Discuss the main purpose of vulcanisation of rubber.

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  16. What are monomeric repeating units of nylon-6and nylon-6.6?

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  17. Write the names and structures of the monomers of the following polyme...

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  18. Identify the monomer in the following polymer structure: (i) [--over...

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  19. How is Dacron obtained from ethylene glycol and terephthalic acid?

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  20. What is a biodegradable polymer ? Give an example of a biodegradable a...

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