1.8 Performance Characteristics of Polymers Flashcards by Unknown Unknown

Give the 6 stock forms of polymers

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

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Define thermoplastic polymer and give five examples

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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State three properties/characteristics of LDPE

Lightweight
Low level of rigidity
Good chemical resistance
Low stiffness

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State two uses of LDPE

Detergent bottles
Toys
Carrier bags
General packaging
Food wrap film

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State three properties/characteristics of HDPE

Tough
Good chemical resistance
Good stiffness
Weather proof

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State two uses of HDPE

Bottles
Crates
Buckets
Bowls

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State three properties/characteristics of PP

Lightweight
Food-safe
Good impact resistance
Good chemical resistance
Tough

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State two uses of PP

Kitchen products
Medical equipment
Rope
Folders

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State three properties/characteristics of HIPS

Good impact resistance
Good stiffness
Lightweight
Hard
Tough

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State two uses of HIPS

Yoghurts pots
Refrigerator linings
Single-use drinks cups
Toilet seats

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State two uses of ABS

Safety helmets
Toys
Computer housing
Rigid luggage

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State two properties/characteristics of ABS

-Tough
- Hard

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State three properties/characteristics of PMMA

Tough
Hard
Good chemical resistance
Food-safe
Durable
Easily machined

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State two uses of PMMA

Illuminated signs
Car light casings
Baths
Lightning units/covers

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State three properties/characteristics of Nylon

Tough
Corrosion resistance
Good temperature resistance
Low coefficient of friction

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State two uses of Nylon

Gears
Textiles
Bearings
Curtains rails

State three properties/characteristics of uPVC

Rigid opaque
Tough
Hard
Good weathering resistance
Good chemical resistance

State two uses of uPVC

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

State two uses of PVC

Hose pipes
Cable insulation
Medical grade tubing

State three properties/characteristics of PVC

Tough
Good weathering resistance
Good chemical resistance
Flexible

State three properties/characteristics of UF

Hard
Good electrical insulator
Brittle

Define thermoset polymer and give three examples

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

State two uses of UF

-Electrical fittings
- Adhesives

State three properties/characteristics of MF

Hard
Opaque
Tough
Heat resistant
Food safe
Chemical resistant

State two uses of MF

Decorative laminates Picnic ware Buttons

State three properties/characteristics of polyester resin

Rigid Heat resistant Chemical resistant Brittle

State two uses of polyester resin

Castings Car parts Chair seats

State three properties/characteristics of epoxy resin

Rigid Hard Tough Chemical resistant

State two uses of epoxy resin

Adhesives Surface coatings Cardiac peacemaker Aerospace

State three properties/characteristics of natural rubber

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

Define elastomer and give three examples

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

State two uses of natural rubber

Tyres Tubes Hoses Footwear Toys

State three properties/characteristics of BR

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

State two uses of BR

Vehicle tyres Shoe soles Toys

State three properties/characteristics of neoprene

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

State two uses of neoprene

Wet suits Laptop cases Industrial wires insulation Transmission belts

State three properties/characteristics of silicone

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

State two uses of silicone

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