Which one of the following is not a thermosetting polymer ?
1 Bakelite
2 polyethylene 3 silicones
4Epoxy
Answers
Answer:
Answer
Correct option is
B
polystyrene
C
PVC
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.
Answer:
Correct option is 2) Polyethylene
Explanation:
Thermoset polymers have different properties than thermoplastic polymers. After molding, it does not soften when heated and cannot be re-molded. Vulcanized rubber is a thermoset rubber that is used in the manufacture of tires. Its polymer chains are connected by cross-links, so they don't slide off each other easily.
An example is shown below.
Polyester Fiberglass Systems: Sheet Molding Compounds and Bulk Molding Compounds
Polyurethane insulation foam, mattress, coating, glue, auto parts, printing roller, shoe sole, flooring, synthetic fiber, etc.
Vulcanized rubber
Bakelite is a phenol-formaldehyde resin used in electrical insulation and plastic products
Duroplast is a light and strong material similar to bakelite, which is used in the manufacture of car parts
Polyvinyl chloride (PVC) and polystyrene are thermoplastic polymers.
How is the insulating property of pvc used in industry ?
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Give reason. PVC is called a thermoplastics.
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