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Polymers

Short Answer Type

241.

Mention two important uses of each of the following:

(i) Bakelite

(ii) Nylon 6

885 Views

242.

Write the names and structures of the monomers of the following polymers:
(i) Buna-S
(ii) Glyptal
(iii) Polyvinyl chloride

3101 Views

243.

Give one example of a condensation polymer.

1105 Views

244.

Define thermoplastic and thermosetting polymers. Give one example of each.

617 Views

245.

What is a biodegradable polymer? Give an example of biodegradable aliphatic polyester.

688 Views

246.

Differentiate between thermoplastic and thermosetting polymers. Give one example of each.

760 Views

247.
(i) What is the role of t-butyl peroxide in the polymerization of ethene?
(ii) Identify the monomers in the following polymer:

(iii)Arrange the following polymers in the increasing order of their intermolecular forces:
Polystyrene, Terylene, Buna-S

OR

Write the mechanism of free radical polymerization of ethene.

(i) In polymerisation of ethene, the source of free radical is needed to initiate the chain reaction. Such free radicals are usually produced by the decomposition of peroxides like t- butyl peroxide or benzoyl peroxide.

(ii)The given polymer is nylon 6, 6.
Monomers of nylon 6,6 are adipic acid (HOOC(CH₂)₄COOH)and hexamethylenediamine (H₂N(CH2)6NH2).

(iii)Elastomers of rubbers have the weakest intermolecular forces of attraction, while fibres have the strongest intermolecular forces of attraction. Plastics have intermediate forces of attraction.
The increasing order of intermolecular forces of attraction of the given polymers is as follows:
Terylene> Polystyrene > Buna-S

Or
The mechanism of free radical polymerization of ethene.

2817 Views

248.

i) What is the role of sulphur in the vulcanization of rubber?
ii) Identify the monomers in the following polymer:

iii)Arrange the following polymers in the increasing order of their intermolecular forces:
Terylene, polythene, Neoprene