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 Multiple Choice QuestionsShort 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?


In addition polymerization, the molecules of the same or different monomers add together to form a large polymer molecule. The monomers used are unsaturated compounds example alkenes, alkadienes and their derviatives. This mode of polymerisation leading to an increase in chain length. Some addition polymers are polythene, Teflon, PAN,etc.


Condensation polymerization is a process in which two or more bi-functional molecules undergo a series of condensation reactions with the elimination of some simple molecules as water, alcohol etc., and leading to the formation of high molecular mass polymers. For example terylene is example of condense polymer.

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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.

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120.

Define thermoplastics and thermosetting polymers with two examples of each.

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