Modification Of Natural Polymers :

Before synthetic polymers such as polyethene and perspex introduce to the market cotton, starch and rubber were familiar materials for years as a natural polymer.main polymers are synthesized by chemical alteration of natural polymers. Prominent examples include the reaction of nitric acid and cellulose to form nitrocellulose and the formation of vulcanized rubber by heating natural rubber in the presence of sulfur. polymers can be modified in some field same as oxidation, cross-linking and end-capping.

When producing polymers, the gas separation by membranes has got main role in petrochemical industry and is now a relatively well-established unit operation. The process of polymer degassing is essential to suit polymer for extrusion and pelletizing, increasing safety, environmental, and product quality aspects. Nitrogen is used for this purpose.