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Question

Which of the following are not thermosetting polymers ?
  1. polystyrene
  2. Bakelite
  3. PVC
  4. Melmac

A
PVC
B
Bakelite
C
polystyrene
D
Melmac
Solution
Verified by Toppr

Thermosetting polymers have different properties to thermosoftening polymers. Once moulded, they do not soften when heated and they cannot be reshaped. Vulcanised rubber is a thermoset used to make tyres. Its polymer chains are joined together by cross-links, so they cannot slide past each other easily.

Examples are given below:
  • Polyester fibreglass systems: sheet molding compounds and bulk molding compounds
  • Polyurithane insulating foams, mattresses, coatings, adhesives, car parts, print rollers, shoe soles, flooring, synthetic fibers, etc. Polyurethane polymers are formed by combining two bi- or higher functional monomers/oligomers.
  • Vulcanized rubber
  • Bakelite, a phenol formaldehyde resin used in electrical insulators and plasticware
  • Duroplast, light but strong material, similar to bakelite used for making car parts

Polyvinyl chloride(PVC) and polystyrene are thermoplastic polymer.
Hence, options B and C are correct.

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