Question

In the manufacture of polythene by the Ziegler process using ethylene, the temperature for proper polymerisation required is:

• A. Below ${10}^{o}C$
• B. ${10}^o$ to ${50}^{o}C$
• C. ${50}^o$ to ${80}^{o}C$
• D. ${80}^o$ to ${140}^{o}C$

Answer 1

The correct option is C ${50}^o$ to ${80}^{o}C$

High density polythene is synthesised from ethylene by Ziegler-Natta polymerisation in the presence of triethylaluminium and titanium tetrachloride (Ziegler-Natta catalyst) at a temperature of 333K $\left({60}^{0}C\right)$ to 343K $\left({70}^{0}C\right)$ and under a pressure of 6-7 atm.

Seeing all options, ${50}^{0}Cto{80}^{0}C$ is the closest one.

Hence, the answer is option $C$.