Which of the following are not thermosetting polymers ?
-
Bakelite
-
polystyrene
-
PVC
-
Melmac
Reveal answer
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B,C
Correct answer
Explanation
Examples are given below:
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.