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
