The polypropylene is an addition polymer. The propylene is used to manufacture the polypropylene polymer. “ The polypropylene is normally tough and flexible, specially when it gets copolymerized with ethylene”.
The Polypropylene is comparatively very economical fibre. It can be made semi-transparent when uncoloured. It can not be as transparent as acrylic and polystyrene.
This pioneer discovery changed the scenario of packaging industries.
The commercial production of isotactic polypropylene started by the Italian firm Montecatini from 1957 onwards. Later on Syndiotactic polypropylene was also first synthesized by Natta and his coworkers.
The head-to-tail polymer is produced using heterogeneous Ziegler-Natta or homogeneous cyclopentadienyl-zirconium catalysts.
If all the methyl groups lie on the same side of the chain, the polymer is called isotactic polypropylene. The chemical structure of isotactic polypropylene is given in below figure.
If the methyl groups alternate in a regular pattern from one side of the chain to the other, the polymer is syndiotactic polypropylene. The chemical structure of syndiotactic polypropylene is given in below figure.
If the orientation of the methyl groups is random, it is called atactic polypropylene polymer. The chemical structure of atactic polymer is given in below figure.