Name a polymer which is used for making unbreakable plastic crockery.

Urea formaldehyde resin - NH - CO - NH - CH 2 - n is a condensation polymer with three-dimensional network structure showing strong intermolecular force between the covalent bonds and is formed by the monomeric units urea NH 2 CONH 2 and formaldehyde HCHO . Due to its thermosetting properties it is commercially used to manufacture unbreakable cups, plastic crockery and laminated sheets.

Arrange the following polymers in the increasing order of their intermolecular forces : Nylon- 6 , neoprene, polyvinyl chloride.

Neoprene is synthetic rubber having weak intermolecular forces hence categorised in elastomers. Nylon- 6 is a fibre having dipole-dipole interactions and polyvinyl chloride is a thermoplastic whose intermolecular forces of attraction are in between those of elastomers and fibres. Thus, increasing order of intermolecular forces : Neoprene < polyvinyl chloride < nylon- 6 .

E M B I B E

All In One ISC Chemistry Class 12>Chapter 15 - Polymers>Chapter Practice>Q 31

EASY

12th ICSE

IMPORTANT

Earn 100

Give the monomer of the polymer teflon.

Important Questions on Polymers

HARD

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 15 - Polymers>Chapter Practice>Q 34

Explain the term copolymerisation and give two examples.

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 15 - Polymers>Chapter Practice>Q 35

Identify the monomer in the given polymeric structure.

Question Image

HARD

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 15 - Polymers>Chapter Practice>Q 36

A natural linear polymer of

2

-methyl-

1

,

3

butadiene becomes hard on treatment with sulphur between

373 - 415 K

and

— S — S —

bonds are formed between chains. Write the structure of the product of this treatment.

HARD

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 15 - Polymers>Chapter Practice>Q 37

Which of the following polymers soften on heating and harden on cooling? What are the polymers with this property collectively called? What are the structural similarities between such polymers? Bakelite, urea-formaldehyde resin, polythene, polyvinyl, polystyrene.

MEDIUM

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 15 - Polymers>Chapter Practice>Q 38

Write the names of the monomers for the polymer : Nylon-