PLASTICS In Design and Technology, understanding
Description: PLASTICS In Design and Technology, understanding about specific materials is key. Materials are ways that you can understand how a product is made and how the materials help it to be suitable for its use Thermoplastics Thermoplastics are
Related Topics
Download Presentation
"PLASTICS In Design and Technology, understanding" is the property of its rightful owner. Permission is granted to download and print the materials on this website for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Presentation Transcript
slide1. PLASTICS In Design and Technology, understanding about specific materials is key. Materials are ways that you can understand how a product is made and how the materials help it to be suitable for its use Thermoplastics
Thermoplastics are made from long chain polymers, joined by weak chemical bonds. When the plastic is softened by heat the bonds break making the plastic ‘semi fluid’ and able to be shaped. As the plastic cools, new weak bonds form and the shape will be fixed. Because no chemical reaction has taken place this process can be repeated many times, making them recyclable, however excessive heat will permanently damage the chemical structure. Thermosetting Plastics
Thermosetting plastics or Thermosets are plastics which are converted into their final form by heat. Once set, they cannot be softened by further heating as they undergo a chemical change. They have strong chemical bonds that hold the long chains together. These make thermosets heat resistant but not recyclable. It is difficult to make products by extrusion or injection moulding as they harden as soon as heated. Manufacturing methods include casting, moulding and laminating. Special plastics
Elastomers
Elastomers are a type of thermoset. The bonds between the chains are ‘springy’ giving them a rubbery quality. Natural rubber is an example it can be vulcanised to make a rigid (ebonite). Latex is a stretchy elastomer used to make surgical gloves. Lycra is an elastomer used to make stretchy clothing.
Ebonite is an early form of plastic that was used to simulate ebony and is hard and used for bowling balls
Composites
are when materials are combined to achieve specific advantages. Examples of composites are Kevlar, GRP (Glass reinforced plastic), Graphite and Carbon Fibre. These are used extensively for sporting uses e.g Bike parts, motor racing car bodies and tennis rackets. Stockland Green Knowledge Organiser - DT- Year 8 – Plastic<br>
slide2. Know it What are the 2 main plastics?
Give an example of a thermoplastics
What are the properties of thermoplastics?
Give the an examples of a thermosetting plastics
What are the properties are thermosetting plastics?
What are elastomers?
Give an example of an elastomer?
What are composites?
Give an example of composites
What plastic would you use for a toy and why?
What plastic would you use for a worksurfaces and why? Grasp it Wooden and metal products have been replaced by plastic. Why do you think that is? Think it Plastics are having a negative impact on the environment. Why do you think this is? Stockland Green Knowledge Organiser - DT- Year 8 - Plastic<br>
Thermoplastics are made from long chain polymers, joined by weak chemical bonds. When the plastic is softened by heat the bonds break making the plastic ‘semi fluid’ and able to be shaped. As the plastic cools, new weak bonds form and the shape will be fixed. Because no chemical reaction has taken place this process can be repeated many times, making them recyclable, however excessive heat will permanently damage the chemical structure. Thermosetting Plastics
Thermosetting plastics or Thermosets are plastics which are converted into their final form by heat. Once set, they cannot be softened by further heating as they undergo a chemical change. They have strong chemical bonds that hold the long chains together. These make thermosets heat resistant but not recyclable. It is difficult to make products by extrusion or injection moulding as they harden as soon as heated. Manufacturing methods include casting, moulding and laminating. Special plastics
Elastomers
Elastomers are a type of thermoset. The bonds between the chains are ‘springy’ giving them a rubbery quality. Natural rubber is an example it can be vulcanised to make a rigid (ebonite). Latex is a stretchy elastomer used to make surgical gloves. Lycra is an elastomer used to make stretchy clothing.
Ebonite is an early form of plastic that was used to simulate ebony and is hard and used for bowling balls
Composites
are when materials are combined to achieve specific advantages. Examples of composites are Kevlar, GRP (Glass reinforced plastic), Graphite and Carbon Fibre. These are used extensively for sporting uses e.g Bike parts, motor racing car bodies and tennis rackets. Stockland Green Knowledge Organiser - DT- Year 8 – Plastic<br>
slide2. Know it What are the 2 main plastics?
Give an example of a thermoplastics
What are the properties of thermoplastics?
Give the an examples of a thermosetting plastics
What are the properties are thermosetting plastics?
What are elastomers?
Give an example of an elastomer?
What are composites?
Give an example of composites
What plastic would you use for a toy and why?
What plastic would you use for a worksurfaces and why? Grasp it Wooden and metal products have been replaced by plastic. Why do you think that is? Think it Plastics are having a negative impact on the environment. Why do you think this is? Stockland Green Knowledge Organiser - DT- Year 8 - Plastic<br>