A) Ziegler-Natta process
B) Heating with peroxides
C) Condensing in sealed tubes
D) Condensing with styrenes
Correct Answer: A
Solution :
\[HDPE\] is prepared by co-ordination polymerization which occurs through the intermediate formation of co-ordination complexes. For example, ethylene first forms a co-ordination complex with the transition metal titanium by donating its \[\pi \]-electrons. The \[\pi \] complex thus formed then reacts stepwise with a large number of ethylene molecules ultimately leading to the formation of a polymer. The polythene so obtained has high density \[(0.97\,g/c{{m}^{3}})\]and higher m.pt. (403K) as compare to \[LDPE\] (density- 0.92 \[g/c{{m}^{3}}\] and m.pt. 384K)
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