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GCSE D.T > AQA ------ Energies, Materials, Systems and Devices > Flashcards

AQA ------ Energies, Materials, Systems and Devices Flashcards

- Modern Materials - Smart Materials - Composite Materials and Technical Textiles

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1
Q

What is a modern material?

A

A new invention or one that has been recently discovered.

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2
Q

What are Biodegradable Polymers made from?

A

Vegetable Starches usually Corn-Starch

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3
Q

What are common Biodegradable polymers and a use for each?

A
  • (PLA) = Polylactic Acid, used for 3D Printing Filament.
  • (PHB) = Polyhydroxybutyrate / Biopol, used for plastic products.
  • (PCL) = Polycaprolacoane / Polymorph, used for manufacturing aawkward shaped such as ergonomics.
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4
Q

What is Polymorph?

A

An item which can take multiple forms.

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5
Q

At what temperature does poly-morph and cool-morph melt?

A

Poly-Morph - 62 degrees

Cool-Morph - 42 degrees

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6
Q

Titanium is an element, it is commonly mixed with other alloys; why?

A

^ It is relatively lightweight, tough and stiff with a low density.
^ It has excellent corrosion resistance making it very versatile.
^ Titanium does not react with the human body

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7
Q

What is fibre optic and what are its uses?

A

Fibre optic cables carry light down a thin glass core, the uses of it are cable TV and broadband infrastructure, endoscopes and microelectronics and novelty goods.

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8
Q

What is Graphene?

A

It was accidentally discovered in 2004, it is one atom thick and has strength 200x steel, it is flexible, transparent, impermeable and highly electrically conductible.

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9
Q

How small are nano-materials

A

They are around the same size as a DNA molecule, they range from 1 to 1000 nano-metres.

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10
Q

How is metal foam created?

A

Gas is injected into liquid aluminium or titanium

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11
Q

What are smart materials?

A

They are materials which change properties and characteristics to respond to external stimulus.

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12
Q

What does a thermochromic material react to?

A

Thermal changes in the enviroment.

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13
Q

What does a photochromic material react to?

A

Ultra-Violet light changes in the enviroment.

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14
Q

What does a hydrochromic material react to?

A

Water (moisture) changes in the enviroment.

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15
Q

What does a piezoelectricmaterial react to?

A

Movement, stress ore electricity changes.

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16
Q

What does litmus paper react to?

A

pH changes

17
Q

What does shape memory alloy (SMA) react to?

A

Heat or electricity

18
Q

What does polycaprolactone react to?

A

Heat

19
Q

What does Quantum Tunnelling Composite react to?

A

Pressure

20
Q

What does nanomaterial react to?

A

Various stimulus

21
Q

What are the types of reinforced plastic?

A

GRP & CRP

22
Q

What is GRP?

A

Glass Reinforced Plastic

23
Q

What is CRP?

A

Carbon Fibre Reinforced Plastic

24
Q

What is Gore-Tex?

A

A waterproof yet breathable fabric membrane

25
Q

How does Gore-Tex work?

A

It has 150 million holes per cm^2

  • This means water droplets are too big to pass through.
  • Perspiration an still escape in the form of water vapour.
26
Q

What is an Aramid?

A

Aramids are particularly tough fibres made from modified polymide.

27
Q

What do Aramids offer?

A
  • Cut and tear resistance
  • Flame proofing
  • Thermal insulation
  • High strength
  • A hard wearing finish
28
Q

What is the name for an Aromatic Polymide?

A

An Aramid

29
Q

How big is a microfibre?

A

Less than one denier thick - one fifth the width of a human hair.

30
Q

What are the disadvantages of microfibre?

A
  • Flammable unless treated
  • Synthetic and not renewable
  • Takes many years to decompose
  • Growing evidence relating it to oceanic polution

GCSE D.T (4 decks)

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