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aqa a level dt# > 1.8 Performance Characteristics of Polymers > Flashcards

1.8 Performance Characteristics of Polymers Flashcards

1
Q

Give the 6 stock forms of polymers

A

Granules
Sheet
Film
Rods and other extruded form, tubes, bars
Foam
Powder

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2
Q

Define thermoplastic polymer and give five examples

A

A material that can be reheated and reshaped repeatedly, allowing it to be recycled after its initial use.
LDPE
HDPE
PP
HIPS
ABS
PMMA (acrylic)
Nylon
PVC

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2
Q

State three properties/characteristics of LDPE

A

Lightweight
Low level of rigidity
Good chemical resistance
Low stiffness

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3
Q

State two uses of LDPE

A

Detergent bottles
Toys
Carrier bags
General packaging
Food wrap film

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4
Q

State three properties/characteristics of HDPE

A

Tough
Good chemical resistance
Good stiffness
Weather proof

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5
Q

State two uses of HDPE

A

Bottles
Crates
Buckets
Bowls

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6
Q

State three properties/characteristics of PP

A

Lightweight
Food-safe
Good impact resistance
Good chemical resistance
Tough

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7
Q

State two uses of PP

A

Kitchen products
Medical equipment
Rope
Folders

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8
Q

State three properties/characteristics of HIPS

A

Good impact resistance
Good stiffness
Lightweight
Hard
Tough

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9
Q

State two uses of HIPS

A

Yoghurts pots
Refrigerator linings
Single-use drinks cups
Toilet seats

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10
Q

State two uses of ABS

A

Safety helmets
Toys
Computer housing
Rigid luggage

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11
Q

State two properties/characteristics of ABS

A

-Tough
- Hard

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11
Q

State three properties/characteristics of PMMA

A

Tough
Hard
Good chemical resistance
Food-safe
Durable
Easily machined

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12
Q

State two uses of PMMA

A

Illuminated signs
Car light casings
Baths
Lightning units/covers

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13
Q

State three properties/characteristics of Nylon

A

Tough
Corrosion resistance
Good temperature resistance
Low coefficient of friction

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14
Q

State two uses of Nylon

A

Gears
Textiles
Bearings
Curtains rails

15
Q

State three properties/characteristics of uPVC

A

Rigid opaque
Tough
Hard
Good weathering resistance
Good chemical resistance

15
Q

State two uses of uPVC

A

Windows frames
External doors
Water service pipes
Guttering and downpipes for buildings

16
Q

State two uses of PVC

A

Hose pipes
Cable insulation
Medical grade tubing

17
Q

State three properties/characteristics of PVC

A

Tough
Good weathering resistance
Good chemical resistance
Flexible

18
Q

State three properties/characteristics of UF

A

Hard
Good electrical insulator
Brittle

18
Q

Define thermoset polymer and give three examples

A

A material that, when heated, undergoes a chemical change whereby the molecules form rigid cross-links. They cannot be reheated and reshaped.

Urea-formaldehyde (UF)
Melamine formaldehyde (MF)
Polyester resin
Epoxy resin

19
Q

State two uses of UF

A

-Electrical fittings
- Adhesives

20
Q

State three properties/characteristics of MF

A

Hard
Opaque
Tough
Heat resistant
Food safe
Chemical resistant

21
Q

State two uses of MF

A

Decorative laminates
Picnic ware
Buttons

22
Q

State three properties/characteristics of polyester resin

A

Rigid
Heat resistant
Chemical resistant
Brittle

23
Q

State two uses of polyester resin

A

Castings
Car parts
Chair seats

24
Q

State three properties/characteristics of epoxy resin

A

Rigid
Hard
Tough
Chemical resistant

25
Q

State two uses of epoxy resin

A

Adhesives
Surface coatings
Cardiac peacemaker
Aerospace

26
Q

State three properties/characteristics of natural rubber

A

High tensile strength
Low elongation
Good hardness
Tough
Electrical insulator
Good cold resistance

26
Q

Define elastomer and give three examples

A

A material that can be deformed under pressure and that returns to its original shape when pressure is released

Natural rubber
Butadiene rubber (BR)
Neoprene
Silicone

27
Q

State two uses of natural rubber

A

Tyres
Tubes
Hoses
Footwear
Toys

28
Q

State three properties/characteristics of BR

A

Tough
Excellent wear resistance against friction
Good thermal resistance against friction
Electrical insulator

29
Q

State two uses of BR

A

Vehicle tyres
Shoe soles
Toys

29
Q

State three properties/characteristics of neoprene

A

Good thermal resistance
Toughness
Good oil and chemical resistance
Excellent weather resistance
Good abrasion resistance
Electrical insulator

30
Q

State two uses of neoprene

A

Wet suits
Laptop cases
Industrial wires insulation
Transmission belts

31
Q

State three properties/characteristics of silicone

A

Poor abrasion resisatnce
Good thermal resistance
Good weather resistance
Good lubricating qualities
Electrical insulator

32
Q

State two uses of silicone

A

Flexible ice cube trays
Bakeware
Cooking utensils
Medical uses as lubrication for prosthetics

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