LH Flashcards
Name 5 Polymers?
High Density Polymer, Low Density Polymer , PLA (used for 3D printing), Polyester, Polypropylene and Epoxy Resin
Name 5 Polymers?
High Density Polymer, Low Density Polymer , PLA (used for 3D printing), Polyester, Polypropylene and Epoxy Resin
What is a Mechanical Property?
Materials which are displayed to external force
Name the 4 main Mechanical Properties?
Toughness, Flexibility, Elasticity, Mouldability
What is a Mechanical Property?
Materials which are displayed to external force
Name the 4 main Mechanical Properties?
Toughness, Flexibility, Elasticity, Mouldability
Name the 4 main Mechanical Properties?
Toughness, Flexibility, Elasticity, Mouldability
Define Toughness?
The ability to absorb energy and deform plasticly without cracking
Define Flexibility?
The ability to be bent or folded without breaking
Define Elasticity?
A materials resistance to distortion and ability to return to its original shape
Define Mouldability?
The ability to be shaped into a form or mould into a shape.
Give an example of Toughness in a product?
Cycle helmet, car bumpers
Give an example of Flexibility in a product?
Thermoplastics, plastic tub lid, Flexible PVC Sheet
Give an example of elasticity in a product?
Inflatable life jacket, inflatable beech ball, Balloon
Give an example of Mouldability in a product?
Mouth guard, thermosetting products
What is Stiffness?
A measure of how rigid a material is
What is Vacuum forming?
The simplest type of Plastic Thermoforming that uses one mold and vacuum to pressure to obtain the desired size.
Give a Physical Properties Definition?
The Measurable characteristics of a product.
Give an example of a Physical Property measuring value commonly used?
Melting point (*c).
What are the 7 main Physical properties?
Thermal Insulation, Selft Finishing, UV resistance, Melting points, Transparency and Translucency, Resistance to chemicals and liquids,
What is Thermal resistance?
Reduces heat transfer, especially between objects and people.
Give an example of thermal resistance materials?
Beechwood and Fiberglass.
Name a Thermal insulating products?
Sauce Pan handles and kitchen utensils.
What is Electrical insulation?
A material that does not allow electricity to flow freely through it.
What is a great electrical insulator?
Polymers are used to make casing and shielding in electrical products.
What is Melting points?
The temperature at which a material changes state from solid to liquid.
What happens to Thermoplastics at high temperatures?
They become soft and can be shaped/moulded.
What happens to Thermosetting Plastics at high temperatures?
Thermosetting plastics generally have high melting points, they don’t melt but they do start to decompose and char.
What is UV resistance?
Ability to withstand UV radiation.
Give a Thermoplastics product?
Mouth guard
How are polymers effected by UV radiation?
UV bleeches plastics and turns it brittle effecting the polymers mechanical properties.
What is a product that uses UV resistance?
Garden Furniture
Name a polymer which is UV resistant?
ABS Polymer
What is Resistant to chemicals?
Some Polymers are selected for their chemical resistance.
Name a polymer resistant to chemicals?
High Density Polyethylene (HDPE)
What is HDPE used to manufacture?
Bleach bottles and chemically resistant piping.
Where is High Density Polyethylene used?
Used to line landfill sites.
Explain the difference between Transparency and Translucency?
Transparency = You can see through an object as light passes through it giving of a clear appearance to the object.
Translucency = Only some light is let through therefore you can still see through an object although unlike Transparency we can’t see clearly through it.
What is Transparency?
Transparency = You can see through an object as light passes through it giving of a clear appearance to the object.
What is Translucency?
Translucency = Only some light is let through therefore you can still see through an object although unlike Transparency we can’t see clearly through it.
Many Polymers are flexible and can be used to form hinges. Explain one disadvantage of using polymers to make hinges?
Although polymers can be used to make hinges after a while these hinges will wear down after the constant mechanical usage which may result in them not being as flexible and result in them breaking.
Explain one advantage of using polymers to make hinges?
Cheaper material to use than metal, more environmentally friendly.
What does Fire retardant do?
Reduces the risk of fire/reduced flammability/ reduces toxic fumes when burnt.
What does Kevlar do?
Commonly know as Bullet proof and knife proof material/ To reduce the risk of being injured against a bullet or blade.
What does Water resistance do?
To protect a product from water damage.
What does a photopolymer do?
Used in coating, electrical and printing industries to protect a product. (responds to UV light).
What does a Thermochromic material do?
To detect the temperature and identify it (reacts to temperature).
What is the definition of toughness?
The ability to absorb energy and deform plastically without cracking.
What is the definition of Elasticity?
A Materials resistance to distortion and ability to return to its original shape.
What is the definition of a Thermal Insulator?
Reduces heat transfer, especially between objects and people.
Name a polymer with the property of toughness?
High Density Polymer.
Name a polymer with the property of Elasticity?
Rubber Latex.
Name a polymer with the property of Thermal insulator?
Fibreglass.
What product is made using high density polymer?
Piping.
What product is made using Elasticity?
Balloons.
What product is made using Thermal insulator?
Window frame.
Define Transparency?
Dictates how permeable a material is to light radiation (how see through it is).
Define Translucency?
Some light may pass through but will be diffused and objects on the other side won’t be clear.
If its Opaque its.….. ?
Impermeable to light.
Where is Translucency used? (2 points)
> In packaging to allow the buyer to see the contents.
Replacement for glass in windows.