Polyolefins
These are obtained by the addition polymerisation of ethylene and its derivatives
1. Polythene
Polymer of ethylene or ethene.
( i) Low density polythene( LDP)
It is tough, flexible, transparent, chemically inert as well as poor conductor pf electricity. It has moderate tensile strength but good tearing strength.
It is used in the insulation of electricity carrying wires and manufacture of queeze bottles, toyes and flexible pipes.
( ii) High density polyethylene( HOP)
It has high density due to close packing. It is also chemically inert and more tougher and harder.
It is used for making containers, house wares, bottles, toyes, electric insulation etc.