Question

difference between thermoplastic and thermosetting plastic??​

Answer 1

Answer:

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Answer 2

Answer

The polymers differ on the basis of their mechanical properties like toughness, elasticity, tensile strength, etc. These mechanical properties depend on their intermolecular forces like hydrogen bonds and van der Waals forces of attraction which bind the polymer chains together. Depending on these intermolecular forces polymers are divided into 4 types:

• Fibres
• Elastomers
• Thermoplastic polymers
• Thermosetting polymers

-Now let’s differentiate between thermoplastic and thermosetting plastics.

Thermoplastic plastics:

• Such polymers or plastics are usually formed by addition polymerisation.

• They are linear or slightly branched long chain polymers.

• They can be easily soften on heating and hardened on cooling.

• They are held together by Van der Waal forces of attraction.

• By nature they are soft, weak and less brittle.

• Their molecular weight is low.

• They are quite soluble in organic solvents.

• They can be remoulded into desired shapes.

• Monomers used here do not have more than two reaction sites.

• Examples: polythene, polystyrene, polyvinyls, etc.

Thermosetting plastics:

• These plastics are usually formed by condensation polymerisation.

• They are cross linked or heavily branched.

• It cannot be softened on heating.

• They are held together by strong hydrogen bonds.

• They are strong, hard and more brittle in nature.

• Their molecular weight is large.

• They are insoluble in organic solvents.

• They cannot be remoulded.

• Monomers used here have more than two reaction sites.

• Examples: bakelite, urea-formaldehyde resins, etc.

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