Tag: polymers of commercial importance

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Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

The commercial name of polyacrylonitrile is:

  1. dacron

  2. orlon (acrilan)

  3. PVC

  4. bakelite
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The commercial name of polyacrylonitrile is orlon or acrilan,

The addition polymerisation of acrylonitrile in presence of a peroxide catalyst leads to the formation of polyacrylonitrile. Polyacrylonitrile is used as a substitute for wool in making commercial fibers.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Few polymers are matched with their uses. Point out the wrong match.

  1. Polyester - Fabric, tyre cords, safety belts

  2. Nylon 6 - Ropes, tyre cords, fabrics

  3. Bakelite - Packaging industry, lubricant

  4. Teflon - Oil seals, gaskets, non-stick utensils
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Uses of bakelite:

  • For making combs, phonograph records, electrical switches,
  • For making handles of various utensils,
  • Paints

So the incorrect option is [C}.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Match the column I with column II and mark the appropriate choice.

Column I Column II
(A) Raincoats, hand bags (i) PHBV
(B) Laminated sheets (ii) PVC
(C) Television cabinets (iii) Urea-formaldehyde resin
(D) Orthopaedic devices (iv) Polystyrene
  1. (A) $\rightarrow$ (i), (B) $\rightarrow$ (ii), (C) $\rightarrow$ (iii), (D) $\rightarrow$ (iv)
  2. (A) $\rightarrow$ (iv), (B) $\rightarrow$ (i), (C) $\rightarrow$ (ii), (D) $\rightarrow$ (iii)
  3. (A) $\rightarrow$ (ii), (B) $\rightarrow$ (iii), (C) $\rightarrow$ (iv), (D) $\rightarrow$ (i)
  4. (A) $\rightarrow$ (iii), (B) $\rightarrow$ (iv), (C) $\rightarrow$ (i), (D) $\rightarrow$ (ii)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
 Raincoats, handbags  (ii) PVC
 Laminated sheets  (iii) Urea-formaldehyde resin
 Television cabinets  (iv) Polystyrene
 Orthopedic devices  (i) PHBV

Uses of polyesters- it is crease resistant and is used in blending with cotton and wool fibers and also as glass reinforcing materials in safety helmets, etc.

So the correct option is [C}.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Novolac on heating with formaldehyde undergoes _______ to form an infusible solid mass called _______.

  1. polymerization, melamine

  2. vulcanization, resin

  3. cross-liking, bakelite

  4. condensation, polystyrene
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

On heating with formaldehyde undergoes crosslinking and form a thermosetting polymer named as$bakalite$.

These are obtained by the condensation reaction of phenol with formaldehyde in the presence of either an acid or a base catalyst. The reaction starts with the initial formation of $o-and/or p-hydroxymethylphenol$ derivatives, which further react with phenol to form compounds having rings joined to each other through –CH2 groups. The initial product could be a linear product – Novolac used in paints.
The correct option is [C].

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

What are blended fibres?

  1. Mixture of two natural fibres

  2. Mixture of two synthetic fibre

  3. Mixture of natural and synthetic fibres

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blended fibres are made by combining various fibres to enhance the property of the product. For eg: spandex and cotton is a natural mix for sports clothing and undergarments to improve stretching properties and prevent odour. A blended fabric helps overcome the disadvantages of natural and synthetic fibre.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

$C{F} _{2} = C{F} _{2}$ is a monomer of:

  1. Teflon

  2. Orlon

  3. Polythene

  4. Nylon-6
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Tetrafluorothylene $C{F} _{2} = C{F} _{2}$ is a monomer of Teflon $ { \left( -C{ F } _{ 2 }-C{ F } _{ 2 }- \right)  } _{ n }$.


             $n  C{ F } _{ 2 } = C{ F } _{ 2 }   \rightarrow   { \left( -C{ F } _{ 2 }-C{ F } _{ 2 }- \right)  } _{ n }$