Plastic materials do not undergo chemical change when heated - Basic Mechanical Engineering

Q.  The plastic materials which do not undergo chemical change when heated are ____
- Published on 02 Sep 15

a. Thermoplasts
b. Thermosets
c. Both a. and b.
d. None of the above

ANSWER: Thermoplasts

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    Discussion

  • Sravanthi   -Posted on 06 Nov 15
    - The synthetic materials which can be moulded into shape under application of heat and pressure are called as plastics. These are further divided into two types such as thermoplastics and thermosetting plastics.

    - Thermoplastics: These plastics do not undergo any chemical change on application of heat and pressure.

    - These plastics remain soft and can be remoulded with heat and pressure. These thermoplastics get hardened only when cooled.

    - Celluloid, Polyamide, Polyethylene, Teflon, etc different types of thermoplastics.

    - Thermosetting plastics:

    - These plastics undergo polymerization on application of additional heat and pressure. Epoxy, Bakelite, etc are the different types of thermosetting plastics.

    - These plastics can be shaped only once after heating

    - Thermosetting plastic such as Epoxy has good toughness and excellent adhesion to metals, glass and wood.

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