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DT for Kate > 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
  • uPVC
  • PVC
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3
Q

State three properties/characteristics of LDPE

A
  • Lightweight
  • Low level of rigidity
  • Good chemical resistance
  • Low stiffness
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4
Q

State two uses of LDPE

A
  • Detergent bottles
  • Toys
  • Carrier bags
  • General packaging
  • Food wrap film
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5
Q

State three properties/characteristics of HDPE

A
  • Tough
  • Good chemical resistance
  • Good stiffness
  • Weather proof
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6
Q

State two uses of HDPE

A
  • Bottles
  • Crates
  • Buckets
  • Bowls
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7
Q

State three properties/characteristics of PP

A
  • Lightweight
  • Food-safe
  • Good impact resistance
  • Good chemical resistance
  • Tough
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8
Q

State two uses of PP

A
  • Kitchen products
  • Medical equipment
  • Rope
  • Folders
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9
Q

State three properties/characteristics of HIPS

A
  • Good impact resistance
  • Good stiffness
  • Lightweight
  • Hard
  • Tough
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10
Q

State two uses of HIPS

A
  • Yoghurts pots
  • Refrigerator linings
  • Single-use drinks cups
  • Toilet seats
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11
Q

State two properties/characteristics of ABS

A
  • Tough

- Hard

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12
Q

State two uses of ABS

A
  • Safety helmets
  • Toys
  • Computer housing
  • Rigid luggage
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13
Q

State three properties/characteristics of PMMA

A
  • Tough
  • Hard
  • Good chemcial resisatcne
  • Food-safe
  • Durable
  • Easily machined
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14
Q

State two uses of PMMA

A
  • Illuminated signs
  • Car light casings
  • Baths
  • Lightning units/covers
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15
Q

State three properties/characteristics of Nylon

A
  • Tough
  • Corrosion resistance
  • Good temperature resistance
  • Low coefficient of friction
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16
Q

State two uses of Nylon

A
  • Gears
  • Textiles
  • Bearings
  • Curtains rails
17
Q

State three properties/characteristics of uPVC

A
  • Rigid opaque
  • Tough
  • Hard
  • Good weathering resistance
  • Good chemical resistance
18
Q

State two uses of uPVC

A
  • Windows frames
  • External doors
  • Water service pipes
  • Guttering and downpipes for buildings
19
Q

State three properties/characteristics of PVC

A
  • Tough
  • Good weathering resistance
  • Good chemical resistance
  • Flexible
20
Q

State two uses of PVC

A
  • Hose pipes
  • Cable insulation
  • Medical grade tubing
21
Q

Define thermoset polymer and give three examples

A

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

  • Urea-formaldehyde (UF)
  • Melamine formaldehyde (MF)
  • Polyester resin
  • Epoxy resin
22
Q

State three properties/characteristics of UF

A
  • Hard
  • Tough
  • Good electrical insulator
  • Brittle
23
Q

State two uses of UF

A
  • Electrical fittings

- Adhesives

24
Q

State three properties/characteristics of MF

A
  • Hard
  • Opaque
  • Tough
  • Heat resistant
  • Food safe
  • Chemical resistant
25
Q

State two uses of MF

A
  • Decorative laminates
  • Picnic ware
  • Buttons
26
Q

State three properties/characteristics of polyester resin

A
  • Rigid
  • Heat resistant
  • Chemical resistant
  • Brittle
27
Q

State two uses of polyester resin

A
  • Castings
  • Car parts
  • Chair seats
28
Q

State three properties/characteristics of epoxy resin

A
  • Rigid
  • Hard
  • Tough
  • Chemical resistant
29
Q

State two uses of epoxy resin

A
  • Adhesives
  • Surface coatings
  • Cardiac peacemaker
  • Aerospace
30
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
31
Q

State three properties/characteristics of natural rubber

A
  • High tensile strength
  • Low elongation
  • Good hardness
  • Tough
  • Electrical insulator
  • Good cold resistance
32
Q

State two uses of natural rubber

A
  • Tyres
  • Tubes
  • Hoses
  • Footwear
  • Toys
33
Q

State three properties/characteristics of BR

A
  • Tough
  • Excellent wear resistance against friction
  • Good thermal resistance against friction
  • Electrical insulator
34
Q

State two uses of BR

A
  • Vehicle tyres
  • Shoe soles
  • Toys
35
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
36
Q

State two uses of neoprene

A
  • Wet suits
  • Laptop cases
  • Industrial wires insulation
  • Transmission belts
37
Q

State three properties/characteristics of silicone

A
  • Poor abrasion resisatnce
  • Good thermal resistance
  • Good weather resistance
  • Good lubricating qualities
  • Electrical insulator
38
Q

State two uses of silicone

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

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