Manufacturing Processes - 1 - Mechanical Engineering (MCQ) questions and answers for Q. 3625

Q.  Why are the plasticisers added with polymers?
- Published on 03 Aug 15

a. To hold other constituents of plastic together
b. To reduce the cost and enhance the strength and hardness of plastics
c. To improve flexibility and to reduce the temperature and pressure required for moulding of plastics
d. None of the above

ANSWER: To improve flexibility and to reduce the temperature and pressure required for moulding of plastics

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    Discussion

  • Pankaj   -Posted on 30 Oct 15
    - Plasticiser can be defined as a material having low molecular weight blended with polymer.

    - Plasticisers are added in polymers to improve flexibility and to reduce the temperature and pressure required for moulding of plastics.

    - But the chemical resistances and the tensile strength of plastics may be reduced due to use of plasticisers.

    - The highest possible percentage of plasticiser in plastic is as high as 60.

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