KEAM 2011 Physics and Chemistry Paper

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).titanium trichloride or tetrachloride).