Q 3. (a) What are thermoplastics? Give two examples of thermoplastics.
(b) What are thermosetting plastics? Give two examples of thermosetting plastics.
Answers
Answer:
(a) What are thermoplastics? Give two examples of thermoplastics.
Ans The property of thermoplastics to become pliable when heated is due to their intermolecular forces which can be reformed on cooling. Common examples of thermoplastics include ABS (acrylonitrile butadene styrene), PMMA (acrylic), polyester.
(b) What are thermosetting plastics? Give two examples of thermosetting plastics.
Ans Common examples of thermoset plastics and polymers include epoxy, silicone, polyurethane and phenolic. In addition, some materials such as polyester can occur in both thermoplastic and thermoset versions.
Explanation:
a)Some of the most common types of thermoplastic are polypropylene, polyethylene, polyvinylchloride, polystyrene, polyethylenetheraphthalate and polycarbonate.
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Polyethylene is probably the most common thermoplastic and is used to make:
Shampoo bottles.
Plastic grocery bags.
Bullet-proof vests.
b)Examples of thermosetting polymers include:
Vulcanized rubber.
Bakelite.
Polyurethane.
Epoxy resin.
Vinyl ester resin.