22. Differentiate between thermoplastics and thermosetting plastics with two examples each. (Any 3 points with two examples each) OR "Avoid plastics as far as possible'. Comment on this advice. (Any 5 points)
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Thermoplastics have secondary bonds between molecular chains. Thermosetting plastics have primary bonds between molecular chains and held together by strong cross-links. Thermoplastics have low melting points and low tensile strength. Thermosetting plastics have high melting points and tensile strength.
Plastics are non-biodegradable materials. So use of plastics is harmful for our environment. The plastics cannot be finally disposed off. Thus, plastics should be avoided as far as possible.
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