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Zeigler-Natta catalyst is used in the pr...

Zeigler-Natta catalyst is used in the preparation of

A

a) low density polythene

B

b) high density polythene

C

c) dacron

D

d) teflon

Text Solution

Verified by Experts

The correct Answer is:
B
High density polythene (HDP) or high density polyethylene (HDPE) is prepared by coordination polymerisation of ethene at `60^(@)-160^(@)C` and 6-7 atm. Pressure in the presence of Zeigler-Natta catalyst (triethylaluminium and titanium trichloride or tetrachloride).
`nCH_(2) = CH_(2) underset((CH_(3)CH_(2))_(3)Al + TiCl_(4))overset(60^(@) - 160^(@)C, 6-7 atm)(rarr) underset("(HDP)")underset("high density polythene")((-CH_(2) - CH_(2)-)_(n))`
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