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Question

Chemistry Question on Polymers

Zeigler-Natta catalyst is used to prepare

A

low -density polythene

B

high density polythene

C

Nylon-6

D

Teflon

Answer

high density polythene

Explanation

Solution

High density polythene (HDP) or high density polyethylene (HDPE) is prepared by coordination polymerization of ethene at 60∘−160∘C60^{\circ} -160^{\circ} C and 6-7 atm. pressure in the presence of Zeigler-Natta catalyst (triethylaluminium and titanium trichloride or tetrachloride). n CH2=CH2−>[333−343K6−7atm][Zeigler Natta catalyst][CH2−CH2]nHigh density polythenen\,CH_2 = CH_2 { ->[{333-343 K 6-7 atm}][{\text{Zeigler Natta catalyst}}] }\underset{\text{High density polythene}}{{[CH_2-CH_2]_{n}}}