SYNTHETIC FIBERS & POLYMER ncert_class8

·       POLYMER : the chain of small units of chemical substances

·       Cotton is also polymer called as cellulose . cellulose is made up of large number of glucose units

• TYPES OF SYNTHETIC OR MAN MADE FIBERS- Rayon , Nylon , Polyester & and acrylic 

• ·       THERMO-PLASTIC : plastics which get easily deformed on heating

        Eg : Polythene and PVC

• ·       THERMO-SETTING : doesn’t get moulded on heating

        Eg: Bakelite and Melamine

• ·       Bakelite is used for making electrical switches and handles for various for utensils

• ·       Melamine can resist fire and tolerate heat better than other plastics

• ·  TEFLON is a special plastic on which oil and water do not sticks . It is used for non stick coating on cookwares