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What is the structural difference betwee...

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

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LDP consists of highly branched chain molecules. Due to branching, the molecules do not pack well and therefore, it has low density `("0.92 g cm"^(-3))` and low melting point. LDP is transparent of moderate tensile strength and high toughness. It is chemically inert.
HDP consists of linear chains and therefore, the molecules can closely pack in space. Therefore, it has high density `("0.97 g cm"^(-3))` and high melting point. It is quite hard, tougher and has greater tensile strength than LDP.
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