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How is the manufacture of LDPE & HDPE?...

How is the manufacture of LDPE & HDPE?

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Low density polythene is manufactured by compressing ethane under very high pressure (1500 - 2000 atmospheres ) at about 475 K in the presence of a small amount of oxygen as catalyst.
`nH_(2)underset("ethene")(C ) = CH_(2) underset(475K, O_(2) "Catalyst")underset(1500 - 200 atm) (rarr) (-underset("polythene"(LDPE))(CH_(2)-CH_(2)CH_(2)-))_(n)`
High density polythene is obtained by passing ethene under pressure of 6 atmospheres at about 340 K into heptane, an inert solvent containing Zielgler- Natta catalyst.
`nH_(2)underset("ethene")(C) = CH_(2) underset("ZieglerNatta catalyst")overset(6 atm, 340K )(rarr) (-underset("Polythene(HDPE)")(CH_(2)-CH_(2) - ))_(n)`
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