Explain why modulus of elasticity of simple thermoplastic polymers such as polys

Question

Explain why modulus of elasticity of simple thermoplastic polymers such as polystyrene and polyethylene are expected to be very low compared with that of metals and ceramics. Explain why modulus of elasticity of simple thermoplastic polymers such as polystyrene and polyethylene are expected to be very low compared with that of metals and ceramics. Explain why modulus of elasticity of simple thermoplastic polymers such as polystyrene and polyethylene are expected to be very low compared with that of metals and ceramics.

Explanation / Answer

Answer:

Modulus of elasticity is determined by number of bonds per molecule and strength of these bonds.As hydrogen forms only one bond with carbon, the bonds per molecule in thermoplastic polymers like polystyrene and polyethylene is lower than in metals and ceramics.

moreover, the thermoplastic polymers have random structure unlike crystalline strucure of metals and ceramics.

hence the modulus of elasticity of simple thermoplastic polymers like plystyrene and polyethylene is low compared to metals and ceremics.

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