  Dried droplets of polymer solutions of different molecular weights and
concentrations leave various types of 'coffee-ring' patterns. These patterns
are consequence of contact line motion. We have observed for very low molecular
weight the droplet periphery part contains spheroidal structures whereas
central part contains continuous layer. For higher molecular weight contact
line exhibits 'stick-slip' motion. Whereas for very high molecular weight
contact line delays enough to start motion and finally moves uninterruptedly
leaving a continuous layer of polymer. We have explained this phenomena in
terms of chain entanglement which is resultant of molecular weight and solution
concentration. Depending on the entanglement chains can exhibit 'granular' and
'collective' behavior even when monomer numbers remain same within the
droplets.
