Smart Materials Flashcards

1
Q

Polymorph

A

Low melting point polymer softens at 60 degrees
Grains fuse together and can be worked into shape
Can be reheated and reshaped

Simulating of injection moulding

Uses - modelling

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2
Q

Thermochemistry ink

A

Changes colour due to temp
Can be applied to any surface-round n flexible inc

Uses- child thermometer, mood rings, gimmicks on many products
Russel Hobbs 2001 thermocolour pink kettle (blue= cold, pink=boiled)

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3
Q

Photochromic pigment

A

Changes colour dependant on light

Uses- glasses –> sunglasses - darker when light intensity increases

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4
Q

Phosphorescent pigment

A

Absorbs light and releases it over a period of time
Dec to replace dangerous radioactive materials
Glow in dark effect

Uses- watch and click hands, emergency warning signs, exit signs

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5
Q

Kevlar

A
5 x strength to weight ratio of steel
Mix of aromatic and aramid molecules melted and spun into fibres
Long chain molecules held by strong H bonds
Woven into a cloth 
Acts as net to absorb energy of impact 
Fibres can't be twisted so woven flat
Many layers for best protection
Structured but flexible 
Low electrical conductivity
High cut and Chemical resistance
Flame resistant and self extinguishing 
High toughness 

Uses- bullet and knife proof armour/vests, aerospace jet engine linings, sports equipment- skis,helmets,racquets, when mixed with polymer- armour playing in helicopters, vehicles and helmets

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6
Q

Carbon fibre

A

Carbon fibres woven into a cloth and impregnated by a resin( epoxy, polyester or phenolic) which bonds it together
Forced into mould , cured in autoclave
Lightweight
High strength

Uses- formula one racing cars , helmets and sports equipment, military- helicopter rotor blades,

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7
Q

SMA

Shape memory alloy

A

Remembers original shape and returns to it
Expands and contracts with temp change
Lightweight
E.g nitinol (nickel and titanium alloy)

Uses- aerospace, biomedical- braces, spectacles frames , electrical connectors

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