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Polymers

Short Answer Type

111.

What is Novolac?

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112.

What type of molecules act as initiators in cationic addition polymerization?

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113.

Give the uses of low density and high density polymers.

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114.

What are natural and synthetic polymers? Give two examples of each type.

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115.

Distinguish between the terms homopolymer and copolymer and give an example of each.

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116.

In which classes the polymers are classified on the basis of molecular forces?

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117.

How can you differentiate between addition and condensation polymerization?

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118.
Explain the term co-polymerization and give two examples.

Co-polymerization is a process in which a mixture of more than one monomeric species is allowed to polymerise. The co-polymer contains multiple units of each monomer in the chain. For example, a mixture of 1.3-butadiene and styrene can form a copolymer such as Buna- S.

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119.

Write the free radical mechanism for the polymerization of ethene.

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120.

Define thermoplastics and thermosetting polymers with two examples of each.

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