polymers Flashcards
1
Q
stock forms
A
- powder
- granules
- sheet
- foam
- film
- rods and other extrusions
- bar
- tube
2
Q
synthetic polymers
A
- made from crude oil
- take hundreds of years to degrade
3
Q
self finishing
A
- polymer can be pigmented during manufacture to give colour
- requires no additional secondary finishing
4
Q
types of polymer
A
- thermoplastic
- thermoset
- elastomer
5
Q
thermoplastics
A
- can be reheated and reshaped repeatedly
- can be recycled after initial use
6
Q
thermoset
A
- when heated, undergo a chemical change where molecules form rigid cross links
- cannot be reheated and reshaped
7
Q
elastomers
A
- at room temperature can be deformed under pressure
- upon release of pressure it will return to its original shape
8
Q
LDPE
A
- thermoplastic
- tough
- good chemical resistance
- low rigidity
- carrier bags
- food wrap film
- squeezy bottles
9
Q
HDPE
A
- thermoplastic
- tough
- weather proof
- good chemical resistance
- chemical drums
- toys
- buckets
- bowls
10
Q
polypropylene
A
- thermoplastic
- tough
- good fatigue resistance
- good chemical resistance
- rope
- food containers
- medical equipment
11
Q
HIPS
A
- thermoplastic
- lightweight
- flexible
- easily vacuum formed
- containers
- yoghurt pots
12
Q
ABS
A
- thermoplastic
- tough
- durable
- good impact strength
- rigid luggage
- control cases and handsets
13
Q
PMMA (acrylic)
A
- thermoplastic
- tough
- brittle
- easily scratched
- good chemical resistance
- car lights
- baths
14
Q
nylon
A
- thermoplastic
- tough
- corrosion resistant
- good temperature resistance
- low coefficient of friction
- cable ties
- boil in the bag food packaging
- gears and bearings
15
Q
uPVC
A
- thermoplastic
- rigid
- tough
- good chemical resistance
- good weathering resistance
- window frames
- doors
- pipes
16
Q
PVC
A
- thermoplastic
- flexible
- tough
- easily extruded
- good chemical resistance
- good weathering resistance
- pipes
- hard hats
17
Q
PET
A
- thermoplastic
- easily blow moulded
- food safe
- bottles
- packaging
18
Q
MF
A
- thermoset
- food safe
- hard
- tough
- heat and chemical resistant
- kitchenware
- work surfaces
19
Q
UF
A
- thermoset
- good electrical insulator
- hard
- brittle
- heat resistant
- electrical casings
- electrical handles
20
Q
polyester resin
A
- thermoset
- strong
- heat resistant
- chemical resistant
- casings
- coatings
21
Q
epoxy resin
A
- thermoset
- rigid
- clear
- hard
- tough
- chemical resistant
- adhesives
- surface coatings
- encapsulation of electrical components
22
Q
natural rubber
A
- elastomer
- high tensile strength
- electrical insulator
- low elongation
- tough
- footwear
- tyres
23
Q
butadiene rubber
A
- elastomer
- tough
- excellent wear resistance against friction
- good thermal resistance against friction
- electrical insulator
- shoe soles
- conveyor belts
24
Q
neoprene
A
- elastomer
- good thermal resistance
- excellent weather resistance
- good abrasion resistance
- wetsuits
- laptop cases
- door seals
25
Q
silicone
A
- elastomer
- good flexibility at low temperatures
- poor abrasion resistance
- good thermal resistance and resistance to temperature extremes
- good weather resistance
- flexible trays
- baking moulds
- medical tubing for drug delivery systems
