HSC Science (General) 12th Board ExamMaharashtra State Board

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How are polythene and neoprene prepared? - HSC Science (General) 12th Board Exam - Chemistry

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How are polythene and neoprene prepared?


Preparation of polythene:
The monomer used is ethane. It is an addition polymer. There are two ways of preparation of ethane.
Low-density polymer (LDPE): It is formed by heating ethene at 200° to 300°C and at 1000 atm pressure using a small amount of oxygen as a catalyst.
Oxygen forms peroxide and the reaction is initiated.

High-density polymers (HDPE): The catalyst used is called Ziegler–Natta catalyst. It is titanium chloride and triethyl aluminium [TiCI4 + (C2H5)3 Al].
The polymerisation takes place at 373 K, 6−7 atm pressure in the presence of the Ziegler–Natta catalyst.

Preparation of neoprene:
2-Chlorobuta-1,3-diene in the presence of benzoyl peroxide forms neoprene. Here, 2-chlorobuta-1,3-diene (chloroprene) acts as a monomer.


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 2015-2016 (March) (with solutions)
Question 6.4 | 3.00 marks
Solution How are polythene and neoprene prepared? Concept: Types of Polymerisation Reactions - Addition Polymerisation Or Chain Growth Polymerisation.
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