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How is high density polythene synthesise...

How is high density polythene synthesised ? Give one important use.

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It is prepared by co-ordination polymerization of ethene by heating (333- 343 K) and at pressure (4 -7 atm) in presence· of Ziegler- Natta catalyst.
`underset("Ethene")(n CH_2=CH_2) underset((CH_3CH_2)Al + TiCl_4)overset(333-343 K, 6-7 atm)to underset(H.D.P.)(-CH_2 - CH_2-)_n`
Use : It is used in the manufacturing of containers e.g., buckets, tubes etc.
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