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Polymers

Question
CBSEENCH12011202
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Of the following which one is classified as polyester polymer?

  • Bakelite

  • Melamine

  • Nylon-66

  • Terylene

Solution

D.

Terylene

Terylene is a polyester polymer because it is formed by the monomer units terephthalic acid and ethylene glycol.

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Question
CBSEENCH11008495
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The straight chain polymer is formed by 

  • hydrolysis of (CH3)3 SiCl followed by condensation polymerisation

  • hydrolysis of CH3SiCl3 followed by condensation polymerisation

  • hydrolysis of (CH2)2Si by the addition of the polymerization

  • hydrolysis of (CH3)2 SiCl2 followed by condensation polymerisation

Solution

D.

hydrolysis of (CH3)2 SiCl2 followed by condensation polymerisation


Straight chain silanes are silicone oils. These are more stable at high temperature than mineral oils and have less tendency to thicken at low temperature.

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Question
CBSEENCH12011313
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The structure of some common polymers is given. Which one is not correctly presented?

  • Teflon

  • Neoprene

  • Terylene

  • Nylon 66

Solution

B.

Neoprene

a) Teflon is a polymer of chloroprene
nCF subscript 2 space equals space CF subscript 2 space rightwards arrow with increment on top space minus left parenthesis CF subscript 2 minus CF subscript 2 right parenthesis straight n minus
b) Neoprene is a polymer of chloroprene (2-chloro buta-1, 3-diene).


Question
CBSEENCH12011143
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Which is the monomer of neoprene in the following

  • CH subscript 2 space equals CH minus straight C identical to CH
  • CH subscript 2 space equals space straight C space minus CH space equals CH subscript 2 space space space space space space space space space space space space space space vertical line space space space space space space space space space space space space space space CH subscript 3
  • CH subscript 2 space equals space straight C space minus CH space equals CH subscript 2 space space space space space space space space space space space space space space vertical line space space space space space space space space space space space space space Cl
  • CH subscript 2 space equals CH minus CH equals CH subscript 2

Solution

C.

CH subscript 2 space equals space straight C space minus CH space equals CH subscript 2 space space space space space space space space space space space space space space vertical line space space space space space space space space space space space space space Cl

Neoprene is synthetic rubber and is a polymer of chloroprene which is chemically 2-chlorobuta-1,3-diene.
CH subscript 2 space equals space straight C space minus CH space equals CH subscript 2 space space space space space space space space space space space space space space vertical line space space space space space space space space space space space space space Cl

Question
CBSEENCH12011152
Wired Faculty App

Which of the following is not condensation polymer?

  • Melamine

  • Glyptal

  • Dacron

  • Neoprene

Solution

D.

Neoprene

Condensation polymers are obtained by bifunctional molecules (monomers) with the elimination of smaller molecules whereas additional polymers are obtained from multiple bonds containing monomers. Neoprene is a polymer of chloroprene (CH2 =C(Cl)-C=CH2) so it is an addition polymer, not a condensation polymer. 

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