MATERIAL PROPERTIES GCSE Design Technology LESSON 2 Plastics

MATERIAL PROPERTIES GCSE Design Technology LESSON 2 Plastics & Polymers Todays learning objectives: - Understand the classifications of plastics & polymers. - Develop familiarity of a range of thermosetting polymers. - Apply taught knowledge to a revision worksheet.

MATERIAL PROPERTIE S LESSON 2 GCSE Design Technology Plastics & Polymers Do Now activity – Match the statements with the descriptions. HARDNESS When a plastic bends and returns to its original shape. PLASTICITY Ability to withstand dents and scratching OPTICAL The way a plastic allows light to pass through it. ELASTICITY How much a plastic can bend without breaking.

MATERIAL PROPERTIE S LESSON 2 GCSE Design Technology Plastics & Polymers Do Now activity – Match the statements with the descriptions. HARDNESS When a plastic bends and returns to its original shape. PLASTICITY Ability to withstand dents and scratching OPTICAL The way a plastic allows light to pass through it. ELASTICITY How much a plastic can bend without breaking.

MATERIAL PROPERTIE S LESSON 2 GCSE Design Technology Plastics & What. Polymers are polymers? Polymers have become increasingly popular since their usage of consumer products back in the 1950 s. As they are versatile and can be coloured, shaped, moulded; as well as being affordable they are used widely in all day to day products. Most polymers are manufactured using crude oil which is nonrenewable. This means it is not sustainable. The increase of use means that chemical engineers are looking for alternatives. Polymers are split into two categories: § Thermoforming § Thermosetting Today we will be learning about the properties of thermosetting polymers & named examples with principal uses.

Polymers Note sheet. Write personal notes during the lesson. Purple indicates todays tasks Key words Thermosets - Thermosetting – Elastomers – long chain molecules – polymers – plastics – rigid cross links – inorganic - synthetic

MATERIAL PROPERTIE S Name Epoxy resin Melamine formaldehyde LESSON 1 GCSE Design Technology Thermosetting Principal uses Thermoforming polymers Casting and encapsulation, Good electrical insulator, hard, adhesives, bonding of other brittle unless reinforced, resists materials chemicals well Properties Laminates for work surfaces, Stiff, hard, strong, resists some electrical insulation, tableware chemicals and stains Stiff, hard, brittle unless laminated, good electrical Polyester resin insulator, resists chemicals well Urea formaldehyde Phenol Formaldehyde Casting and encapsulation, bonding of other materials Electrical fittings, handles and Stiff, hard, strong, brittle, good control knobs, adhesives electrical insulator Hard, heat & chemical resistant, Good electrical insulator, limited colours available. Electrical fittings, saucepan handles, bowling bowls.

MATERIAL PROPERTIE S LESSON 2 GCSE Design Technology Plastics & Polymers Thermosets Long chain molecules held together by rigid cross links. These links prevent the plastic being reshaped through the application of heat. Elastomers Long chain molecules considered to be coiled like sprigs. When the material is distorted (compressed/stretched) the molecules distort, returning to their original shape when released.

MATERIAL PROPERTIE S LESSON 2 GCSE Design Technology Plastics & Polymers How many of the polymer names do you know from the symbol alone? Discuss in pairs. P. S. These materials are the ones commonly found at home for packaging. There are more which we will use in the workshop.

MATERIAL PROPERTIE S LESSON 2 GCSE Design Technology Plastics & Polymers PLENARY: What have you learnt so far this lesson? Write a paragraph discussing the differences between the three types of plastics. Discuss the main differences between polymers and plastics. Key words Thermosets - Thermosetting – Elastomers – long chain molecules – polymers – plastics – rigid cross links – Packaging symbols