A) low density polythene
B) high density polythene
C) Dacron
D) Teflon
E) PVC
Correct Answer: B
Solution :
High density polythene (HDP) or high density polyethylene (HDPE) is prepared by coordination polymerization of ethene at \[60{}^\circ \]\[-160{}^\circ C\]and 6-7 atm. pressure in the presence of Zeigler-Natta catalyst (triethylaluminium and titanium trichloride or tetrachloride). \[nC{{H}_{2}}=C{{H}_{2}}\xrightarrow[{{(C{{H}_{3}}C{{h}_{2}})}_{3}}Al+TiC{{l}_{4}}]{60{}^\circ -160{}^\circ C,6-7\,-atm}\] \[\underset{\begin{smallmatrix} high\text{ }density\text{ }polythene \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,(HDP) \end{smallmatrix}}{\mathop{-(C{{H}_{2}}-C{{H}_{2}}){{-}_{n}}}}\,\]
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