Question

Which of the following is used to manufacture thin carrier bags?

A.LDPE (Low Density Polyethylene)

 

B.HDPE (High Density Polyethylene)

 

C.Polycarbonate

 

D.PVC

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Answer 1

Answer:

B. HDPE (high density polyethylene)

Answer 2

Answer:

For the manufacture of thin carrier bags, LDPE ( low density polyethylene) is used.

Therefore, the option (A) is correct.

Explanation:

• Low density polyethylene is formed by the free radical polymerization of ethylene.
• LDPE is manufactured by heating of pure ethylene to 463-483K temperature under a pressure of 1500atm in the presence of traces of oxygen.
• Free radical addition polymerization of ethylene is initiated by oxygen.

             n CH₂=CH₂      →       [-CH₂-CH₂-]ₙ

                ethylene                Polyethylene

• The polymer formed consists the highly branched chain molecules. The branches prevent the close packing. Therefore, they are low density.
• LDPE is chemically inert, flexible, tough and very poor conductor of electricity.