In this post, you will get the Polymer chapter questions and answers (short questions and answers) of the Applied Chemistry or Engineering Chemistry Book of Diploma or Polytechnic Engineering Students and B.Tech. Engineering 1st Year Students. In the post we have many short questions and their answers of polymer chapter. Students have to go through this to score better in final exam because these questions are very important.
Welcome to Poly Notes Hub, a leading destination for diploma and degree engineering notes for diploma and degree engineering students.
Author Name: Arun Paul.
Polymer Chapter Questions and Answers | Applied Chemistry for Engineering 1st Year Students
Here we have listed some questions and answers of polymer chapter of applied chemistry or engineering chemistry book –
1. What is thermosetting plastic (or polymer)?
Answer:
Thermosetting plastics are polymers that, once hardened by heat or chemical action, cannot be softened again. They undergo permanent chemical changes.
Example: Bakelite, Melamine.
2. Write short notes on thermosetting plastic and its use.
Answer:
Thermosetting plastics become permanently hard when heated and molded. They do not soften again on reheating.
Uses: Used for making switches, handles of utensils, and electric plugs.
3. How thermosetting plastic differs from thermoplastic resin (i.e., polymers)?
Answer:
| Property | Thermoplastic | Thermosetting Plastic |
|---|---|---|
| Softening | Softens on heating | Does not soften on reheating |
| Reuse | Can be remolded | Cannot be remolded |
| Bond type | Weak intermolecular forces | Strong cross-linked structure |
| Example | PVC, Polythene | Bakelite, Melamine |
4. Give one example of each of thermoplastic and thermosetting plastic. Mention their uses.
Answer:
- Thermoplastic: PVC – used for pipes and wires.
- Thermosetting: Bakelite – used for switches and plugs.
5. Write down the starting material of polythene.
Answer:
Starting material: Ethylene (C₂H₄).
6. Write down the structural formula of Teflon.
Answer:
Formula: (–CF₂–CF₂–)ₙ
Teflon is polytetrafluoroethylene (PTFE).
7. What is Teflon and mention its uses.
Answer:
Teflon is polytetrafluoroethylene (PTFE), a polymer of tetrafluoroethylene.
Uses: Non-stick cookware coating, electrical insulation, gaskets, and seals.
8. What is PVC and mention its uses.
Answer:
PVC stands for Polyvinyl Chloride, a thermoplastic polymer.
Uses: Used for pipes, cable insulation, and synthetic leather.
9. PVC is a polymer of —
Answer:
Vinyl chloride (CH₂=CHCl).
10. What is the basic component of PVC?
Answer:
Basic component: Vinyl chloride monomer.
11. What is synthetic fibre?
Answer:
Synthetic fibres are man-made fibres prepared from chemical substances like petrochemicals.
Examples: Nylon, Rayon, Polyester.
12. Name the raw materials used for the manufacture of Terylene.
Answer:
Raw materials: Ethylene glycol and terephthalic acid.
13. Name the raw materials used for the manufacture of Nylon 6.
Answer:
Raw material: Caprolactam.
14. What is the starting material for preparation of Nylon 6,6?
Answer:
Starting materials: Hexamethylenediamine and Adipic acid.
15. Write short notes on Bakelite and its uses.
Answer:
Bakelite is a thermosetting plastic made from phenol and formaldehyde.
Uses: Used for switches, handles, radio cases, and electrical fittings.
16. Write down the preparation and use of Bakelite.
Answer:
Preparation: By the condensation of phenol with formaldehyde in presence of an acid or base catalyst.
Use: Electrical goods and heat-resistant articles.
17. Write down two important uses of Bakelite.
Answer:
- Electrical switches and plugs
- Handles of utensils and radio cases.
18. What is vulcanisation? What is its importance?
Answer:
Vulcanisation: The process of heating raw rubber with sulfur to improve its strength and elasticity.
Importance: Increases hardness, tensile strength, and resistance to heat and wear.
19. Name the compound used in the vulcanisation of rubber.
Answer:
Compound: Sulphur (S₈).
20. Write short notes on vulcanisation.
Answer:
It is the process of heating natural rubber with 3–5% sulfur at about 140°C to form cross-links between rubber chains, improving elasticity and durability.
21. Mention some drawbacks of natural rubber.
Answer:
- Softens in heat and becomes brittle in cold.
- Easily attacked by oils and organic solvents.
- Poor resistance to oxidation and ozone.
22. Write short notes on Neoprene.
Answer:
Neoprene is a synthetic rubber obtained by polymerization of chloroprene.
Uses: Used for hoses, belts, and oil-resistant rubber goods.
23. Name the raw materials for the manufacture of Buna-S.
Answer:
Raw materials: Styrene and Butadiene.
24. Write short notes on Buna-S.
Answer:
Buna-S is a synthetic rubber made by copolymerization of butadiene and styrene.
Uses: Used in tyres, footwear, and conveyor belts.
25. Write short notes on silicone and its uses.
Answer:
Silicones are polymers of organosilicon compounds having Si–O–Si linkages.
Uses: Lubricants, waterproofing materials, and electrical insulators.
26. What is silicone? What is its use?
Answer:
Silicone is a polymer containing alternate silicon and oxygen atoms with organic groups attached to silicon.
Uses: Used in sealants, lubricants, medical implants, and cosmetics.