Question

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

Answer 1

• HDP is high-density polythene and consists of linear molecules. It has a high density due to the close packing of molecules. (e.g., Polythene)
• LDP is low-density polythene and has a highly branched structure, due to which molecules cannot be closely packed. (e.g., Neoprene)
• LDP is tough but not too hard due to its low density. It is chemically inert and a poor conductor of electricity. Hence, it is used in the insulation of electrical wires.
• LDP is flexible due to low density and is used in manufacturing squeeze bottles, flexible pipes etc.
• HDP is also chemically inert, tougher, and harder than LPD. Hence, HDP is used in making buckets, dustbins, pipes, hard plastic bottles etc.