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SAI International School


                                                     Class – VIII

                                               Subject – Chemistry

                               Topic – SYNTHETIC FIBRES AND PLASTICS

                                      Sub-Topic – Polyester and Acrylic



                                                  LESSON NOTES




        POLYESTER:


              Polyester is a polymer of many repeating ‘ester’ units.

              Esters are the organic chemical substances which give
               sweet fruity smell.


              Polyester is manufactured from petroleum products
               called as Petrochemicals.


              When molten polyester is forced through the tiny holes of a spinneret, thin polyester threads
               are formed.


              The polyester yarns can then be woven to make fabrics.

              Polyester fibres are stronger and also softer than nylon

               fibres.

              Terylene is a popular polyester fibre.

              PET (Polyethylene terephthalate), the commonly used

               polyester, is made from two monomers by condensation polymerization.



            Properties of Polyester:


              Polyester fibres are extremely strong, elastic, durable and are resistant to most chemicals.

              Polyester fibres are extremely fine and are wrinkle resistant.

              Polyester does not absorb water, so it dries quickly.


              Due to these properties, synthetic fibres are much more superior to natural fibres like
               cotton, wool and silk.




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