A) free-radical liquid phase of polymerization
B) free-radical gas phase polymerization
C) Zeigler-Natta or oxide catalyzed polymerization
D) anionic polymerization
Correct Answer: C
Solution :
High density polythene is prepared by heating ethvlene at about 330-350 K, under a pressure of 1-2 atm in the presence of Zeigler-Natta catalyst. It has high density \[(0.97\text{ }g/c{{m}^{3}})\]and higher melting point. It is used in the manufacture of containers (buckets, tubes) and differnt housewares, pipes, etc. \[nC{{H}_{2}}=C{{H}_{2}}\xrightarrow[Zeigler-Natta\,catalyst]{330-350\,K,1-2\,atm}\] \[\underset{polyethylene}{\mathop{{{(-C{{H}_{2}}-C{{H}_{2}}-)}_{n}}}}\,\]
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