Thermosetting and Thermoplastic


Synthetic Fibres and Plastics II - Concepts
Class - Navodaya Entrance 9th Subjects
 
 
Concept Explanation
 

Thermosetting and Thermoplastic

Material which can be easily moulded into any desired shape on heating is called a ‘plastic’. Plastics are synthetic (man – made) polymers. Plastics form an important class of synthetic materials. In plastics, the arrangement of the individual units may be linear or cross-linked.

There are Basically Two Types of Plastics :

  • Thermoplastic 
  • Thermosetting plastic
  •                     Thermoplastics

                 Thermosetting plastics

           1  Thermoplastics are long chain polymers with no cross linking. Heating also does not produce any cross linking between the chains.

           1.Thermosetting plastics are the polymers in which chains get highly cross lined on heating.

           2.  Thermoplastics can be melted by heating and thereafter moulded into desired Shapes. This is a reversible process.

            2.    Unlike thermoplastics, thermosetting plastics cannot be remoulded after reheating.

     3.  PVC (Polyvinyl chloride) and LDPE (low-density polyethylene) are examples of thermoplastics. 

     3.  Melamine and Bakelite are example of             thermosetting plastics.

                    

    Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

     PVC (Polyvinyl chloride) and LDPE (low-density polyethylene) are examples of _______________________ .

    Right Option : B
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    Explanation
    Question : 2

    Which of the following statements is true for thermoplastic and thermosetting plastic?

    Right Option : C
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    Explanation
    Question : 3

    Match the following:

    Column - I    Column - II
    A. ThermoplasticsP. Endoscopes
    B. Glass fibre Q. Bakelite
    C. Thermosetting plastices R. Polypropylene
    D. Optical fibre   S. Used in making space suits
    Right Option : B
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    Explanation
     
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