What is the structural difference between HDP and LDP? How does the structure account for different behaviour and nature hence use of polymer?

Explanation

HDP (High density polythene) consists of linear chains of monomer units that are closely packed in space. That is why its density is high as compared to LDP (Low density polythene) in which the monomer chains are branched and are loosely packed. The structural difference is responsible for the two types of polythenes.
Low density polythene is chemically inert and tough but flexible and a poor conductor of electricity and it is used in the manufacture of flexible pipes, toys, squeeze bottles, etc., whereas high density polythene is quite harder, tougher and has greater tensile strength than low density polythene. It is also chemically inert and it is used in the manufacture of containers (buckets, tubes, dustbins, etc.).