The document summarizes different types of plastics, their properties, and common uses. It discusses thermosetting plastics like bakelite and formaldehyde that permanently harden when heated. It also covers thermoplastics like polyvinyl chloride (PVC), polythene, polystyrene, and nylon that can be re-softened and re-molded. These plastics have a variety of applications including electrical equipment, pipes, toys, medical packaging, clothing, and construction materials. The document concludes by thanking the audience for the opportunity.

1. CHEMISTRY SEMINAR PLASTICS

2. POLYMERISATION

4. POLYMERS WITH WATER REPELLENT Silicone polymers do not have carbon Silicones are water repellent , heat stable, and very resistant to chemical. SILICONES

5. PLASTICS Plastics are Polymers Of Organic Compounds Or Resins that can be moulded Into any shape by the application of heat and pressure.

6. TYPES OF PLASTICS Thermos Plastics Or Thermoplast Thermosetting Plastics or Thermoset

7. A Plastic material that can be soften when heated with Pressure and can me remodeled into another shape. THERMOPLASTICS

8. EXAMPLE Poly Venyl Chloride

9. POLYETHENE

10. THERMOSETTING PLASTICS THERMOSETTING PLASTICS Have the property of becoming permanently hard and rigid when heated or cured. It cannot be softened or remoulded. The phenol resins and plastics were the original synthetic thermosetting materials

11. EXAMPLES BAKETIE FORMALDEHYDE

12. MECHANICAL PROPERTIES OF PLASTICS The strength to weight ratio of plastics is higher than that of light metals. Plastics Degrade at At high temperature. Plastics are Good insulators. Creep is an important property that it cannot withstand its own weight and undergoes change in shape.

13. GLASS TRANSITION TEMPERATURE (Tg) A Thermoplastic which becomes an Elastomer (resembles a rubber) on heating to a particular temperature.

14. USES OF BAKELITE Bakelite Called as “Material” OfThousands”has the following uses. Bakelite was a Water and solvent resistant. It is used in the Manufacture Of electrical Equipments. It is used to make telephone, radio and TV cabinets.

15. USES OF FORMALDEHYDE It is a resin used widely as glue, fire retardant and water repellant. It Is Used In tanning industry and for treating various vegetable proteins to render them fibrous. It Is Used For Moulding It Is Used As A Laminating Adhesives .

16. THERMOCOLE (Polystyrene) It is used for making toys, radio, and TV parts. It is used for making high frequency electrical insulators. It is used for making models and so on.

17. POLY VINYL CHLORIDE It brings water to our homes, covers our walls and floors, and does countless other important tasks PVC is used in fluorescent light diffuser panels. PVC is used in wiring and cable covering, shrink-on seals on medicine and food containers, shatter-proof bottles, protective clothing, life rafts, life jackets, sporting goods,conveyor belts in coal mines, non-slip flooring, and foam cores of some sailing boats.

18. NYLON Nylon is popular for hosiery and is used to make track pants, shorts, swimwear, active wear, windbreakers, bedspread. It is used in making ropes, clothes. It is used to make gears and bearings. It can also be made into parachutes, combat uniforms, tires and life vests, and in fishing nets, umbrellas.

19. POLYTHENE It is used in manufacture of sandwich bags, cling wrap, car covers, squeeze bottles, liners for tanks and ponds, moisture barriers in construction. It is used in freezer bags, water pipes, wire and cable insulation. It is used to make Laboratory articles.

20. END OF SEMINAR THANK YOU ALL 4 GIVING ME THIS GOLDEN OPPURTUNITY By Your Class Mate , D.Jebastin