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How are the polymers classified based on...

How are the polymers classified based on heat treatment? 

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Based on heat treatment polymers are two types. They are thermoplastic polymers and thermosetting polymers.
Thermoplastic polymers are addition linear polymers. These soften and melt on heating. They can be remoulded, recast and reshaped.  
eg: PVC, polystyrene, nylon, etc.  
Thermosetting polymers are condensation cross linked polymers. These become more hard on heating. They cannot be remoulded or reshaped, eg : Bakelite, terylene, urea - forinaldehyde resin, etc.
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Knowledge Check

  • Polymers can be classified on the basis of

    A
    Origin
    B
    Structure
    C
    Mechanism
    D
    Synthesis

  • The combination of several monomers under suitable experimental condition to form a giant, three dimensional polymer is known as polymerisation. Natural polymers are classified on the basis of their chemical composition. Synthetic polymers are classified on the basis of the physical properties, into elastomers, plastics and fibres. Identify the incorrect statement regarding thermosetting polymers

    A
    They soften on heating
    B
    They are formed by condensation reaction
    C
    They have cross-linked structure
    D
    They are hard rigid are brittle

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