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प्रश्न
Which of the following polymers are condensation polymers?
(i) Bakelite
(ii) Teflon
(iii) Butyl rubber
(iv) Melamine formaldehyde resin
उत्तर
(i) Bakelite
(iv) Melamine formaldehyde resin
Explanation:
Novolac on heating with formaldehyde undergoes cross-linking to form an infusible solid mass called bakelite.
Bakelite
Melamine formaldehyde polymer is formed by the condensation polymerisation of melamine and formaldehyde.
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संबंधित प्रश्न
Write the names and structures of the monomers of the following polymers: Buna-N
Classify the following as addition and condensation polymers: Terylene, Bakelite, Polyvinyl chloride, Polythene.
Explain the difference between Buna-N and Buna-S
Distinguish between the terms homopolymer and copolymer and give an example of each.
How do you explain the functionality of a monomer?
Define the term polymerisation.
Write the name and structure of one of the common initiators used in free radical addition polymerisation.
Shyam went to a grocery shop to purchase some food items. The shopkeeper packed all the items in polythene bags and gave them to Shyam. But Shyam refused to accept the polythene bags and asked the shopkeeper to pack the items in paper bags. He informed the shopkeeper about the heavy penalty imposed by the government for using polythene bags. The shopkeeper promised that he would use paper bags in future in place of polythene bags.
1) Write the values (at least two) shown by Shyam.
2) Write one structural difference between low-density polyethene and high-density polyethene.
3) Why did Shyam refuse to accept the items in polythene bags?
4) What is a biodegradable polymer? Give an example.
In addition polymer monomer used is
High density polyethylene (HDPE) can be prepared from ethylene by
