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What is the structural difference between \text {HDP} and \text {LDP}? How does the structure account for different behaviour and nature, hence the use of a polymer?

 

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 \text {LDP} or Low-density polythene has a highly branched molecular structure. It has low density (0.92 g/cm 3) and low melting point, as the molecules do not pack well due to branching. It is transparent and chemically inert with moderate toughness.
\text {HDP} or High-density polythene has linear chains, and thus the molecules are closely packed in space. Therefore, it has a higher density and melting point. In comparison to \text {LDP}, it is harder, tougher and has greater tensile strength.

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