Polystyrene Uses Packing Insulation Food containers Disposable Cutlery

Polystyrene Uses Packing  Insulation  Food containers  Disposable Cutlery

Polystyrene Uses Packing Insulation Food containers Disposable Cutlery Electronic Casings Toys Piping How its made

Formed from monomers of Styrene Polymerization initiated by heat or catalysts Structure Atactic Referred to as Regular Polystyrene

Syndiotactic More highly ordered structure gives this form a higher melting point Isotactic Not produced commercially

Syndiotactic and Atactic PS Properties Pure Polystyrene is a colorless, hard, brittle plastic Polystyrene is a Thermoplastic Melts to liquid when heated Freezes to brittle glassy state when cooled This property allows for PS to be molded and extruded

Properties Density Electical Conductivity Thermal Conductivity Tensile Strength Glass Temperature Melting Point Heat Transfer Coefficient Specific Heat 1050 kg/m3 10-16 S/m 0.08 W/(m-K)

46-60 MPa 95C 240C 0.17 W/(m2-K) 1.3 kJ/(kg-K) Types of Polystyrene Solid Foam Expanded

Polystyrene Extruded Foam Styrofoam Copolymers High Impact Polystyrene Solid Foam

Also called expanded polystyrene (EPS) Most commonly used form of PS Produced by mixing PS with gaseous blowing agent (CO2) Used for Disposable coffee cups

Packaging Insulation Extruded Foam Known commercially as Styrofoam Produced by PS pellets

being fed through an extruder with additives and a blowing agent Higher structural strength than solid foam Used for Building construction (insulator) Foam plates and trays Clam shells

Copolymers High impact Polystyrene (HIPS) PS mixed with polybutadiene rubber Mixing gives PS more flexibility

Two phase polymergraft polymer Used for Toys Product castings Questions?

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