Polymer is a long molecule made up from lots of small molecules called monomers. This lecture briefly present on structure and properties of Polymers. This lecture also brifly present on Addition polymerisation, Copolymerisation, Crystalline polymers. Elastomers, plastics and fibres. Finally discuss on what decides the properties of a polymer. In poly(ethene) attractive forces are weak instantaneous dipole – induced dipole, will it be flexible or not. And nylon has strong hydrogen bonds, why does this make it a strong fibre.