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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.

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119.
Write the free radical mechanism for the polymerization of ethene.

Free redical mechanism involves three steps, such as ;
i) chain initiating step
ii) chain propagating step
iii)chain terminating step

In the polymerisation of ethene to polythene. Ethene is heating or exposing to light with benzoyl peroxide initiator. In this process a larger free radical is form.

As this radical reacts with another molecule of ethene, another bigger sized readical is formed. The repetition of this sequence is known as chain propagating step.

For the treminating of the long chain, these free radical can combine on different ways to form polythene.