AQA GCSE Design and Technology 8552
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1 AQA GCSE Design and Technology 8552 Polymers Unit 3 Materials and their working properties 4
2 Objectives Know the primary sources of materials for producing polymers Be able to recognise and characterise different types of polymers Understand how the physical and working properties of a range of thermoforming and thermosetting polymers
3 The age of plastic For more than 50 years, the global production and consumption of plastic has continued to rise Approximately 300 million tons of plastic is produced each year Plastic is relatively inexpensive to produce and very versatile Name a range of products you have used today that have been made from plastic and try to identify their properties
4 What are polymers? Polymers are mostly synthetic materials They are usually derived from finite resources such as coal, natural gas or crude oil More renewable and sustainable materials such as vegetable starches are being used to make bio-plastics What are the benefits of sourcing natural materials?
5 Plastic categories Plastics are categorised into two types: Thermoforming Thermosetting Also known as thermoplastics, when heated the plastic becomes soft and flexible Also known as thermosets, this plastic cannot be reformed once set in to shape Thermoplastics can be remoulded without affecting the material s physical properties Thermosets have strong chemical bonds between the molecules, which do not separate on heating
6 Molecular structure Thermoforming plastics Thermosetting plastics Long chains of loose molecules that have no fixed structure or pattern Individual monomers join to form a large polymer. These long chains of molecules are cross linked resulting in a rigid molecular structure
7 Thermoplastic pros and cons Thermoplastics can be repeatedly heated and moulded Thermoplastics are not suitable for use in areas of heat or UV sensitivity A good surface finish can be achieved for superior aesthetics They can be recycled Each time the plastic is reheated it will try to return to its original shape this is known as plastic memory What are the benefits of reusing plastics?
8 Thermosets pros and cons Thermosets are hard and durable with good structural rigidity They are: able to withstand higher temperatures waterproof when solid, so ideal for use in adhesives a good electrical insulator cannot be remoulded
9 Worksheet Complete Task 1 of your worksheet
10 Moulding and forming Plastics can be formed using a variety of processes Blow moulding forming hollow plastic items Extrusion creating objects with a cross section profile Injection moulding injecting softened plastic into a mould Vacuum forming - sheet of softened plastic forced onto a mould Which process has been used for the following items?
11 Polyethylene This is the most common thermoplastic with over 80 million tonnes produced globally each year There are several types of polyethylene including Polyethylene terephthalate (PETE) High density polyethylene (HDPE) Low density polyethylene (LDPE) Polyethylene can be rigid with good strength to weight ratio It has good ductility and impact strength Its stability makes it a suitable plastic for blow-moulding
12 Uses of polyethylene Suggest two other items that may be made from each of the different types of polyethylene Polyethylene terephthalate Lightweight, chemically resistant, stable, easily blow moulded High density polyethylene Lightweight, rip and chemical resistant, stiff and resists cracking Low density polyethylene Flexible, tough, high strength to weight ratio, easily extruded into sheets
13 Polyvinyl chloride PVC is widely used for packaging, pipes, outerwear, electrical tapes and children s toys PVC can be rigid and commonly used for making pipes It is tough and easily extruded With the addition of plasticisers, it becomes flexible What makes PVC suitable for sports equipment?
14 Polypropylene A very versatile polymer, polypropylene is used for solid plastics, films and fibres It has low density, making it lightweight It is ductile, enabling it to stretch for use in fibres and films It s chemically resistant and easily cleaned which makes it very suitable for food containers Which types of food packaging would PP film be suitable for?
15 High Impact Polystyrene HIPS is shatterproof and a good insulator It s flexible and lightweight so ideal for vacuum forming Impact resistant, it is suitable for food containers particularly yoghurt pots and fast food containers HIPS is easily mouldable and has a good gloss finish What other items would be suitable to be made from HIPS and why?
16 Acrylic Polymethyl- Methacrylate This versatile and hard wearing plastic, comes in a variety of thicknesses and colours It s a tough plastic, but becomes brittle if very thin It can also be spun into threads and woven Name some items of clothing that may utilise acrylic?
17 Resin identification codes Thermoplastics must be recycled separately to enable reuse, where possible In order to easily separate items, thermoplastics are marked with a common code Polyethylene terephthalate High-density polyethylene Polyvinyl chloride Low-density polyethylene Polypropylene Polystyrene Other plastics, such as acrylic, nylon and polycarbonate
18 Epoxy resin Epoxy resins are a class of reactive polymers Supplied as two liquids; a resin with a hardener which acts as a catalyst to set the resin Epoxy resins are used as adhesives, for example Araldite With a good strength to weight ratio, epoxy adheres well to fibreglass and carbon fibre, reinforcing it What protective measures should you take when working with epoxy resin?
19 Polyester resin Polyester resin is a viscous, pale polyester solution and the addition of a catalyst, hardens the resin The hardened resin is tough with high abrasion resistance which makes a high-performance coating for areas of high wear, for example flooring Clear polyester resin is suitable for object embedding, clear sculpture casting and jewellery making Resin replicas e.g. anatomical models can also cast be cast and painted
20 Composite adhesive Polyester resin is commonly used with composite materials such as fibreglass Lightweight and weatherproof, it s used to adhere layers of fibreglass in the making of boat hulls, vehicle parts and panels for caravans
21 Formaldehyde An early compound, thermoset products made using formaldehyde include: Melamine formaldehyde Phenol formaldehyde Urea formaldehyde Phenol formaldehyde (created in 1909) was known as Bakelite Very rigid and hard, it was often used for electrical components and household items such as clocks, radios and telephones
22 Melamine formaldehyde Melamine is a hard thermoset A heavy material, it has good resistance to heat, chemicals and moisture It has good resistance to scratches, but it is prone to chipping Available in a range of colours and thicknesses, it is often used for picnic wear and as a laminate for kitchen surfaces What will happen if you put your melamine bowl in the microwave?
23 Urea formaldehyde Urea formaldehyde is a good electrical insulator With good heat resistance it is used for manufacturing electrical fittings The textiles industry treats some fabrics with UF resins to promote easy care properties such as anti-wrinkling The paper industry uses UF to improve tear strength The timber industry uses UF resin to bind particles in the making of manufactured boards such as MDF
24 Worksheet 3 Complete Tasks 2 5 of the worksheet
25 Plenary State the two categories of plastics Name one finite resource from which polymers are derived What is the most environmentally effective way of disposing of plastic? Suggest a plastic with good electrically insulative properties Name two plastics suitable for food packaging
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