Polymers Flashcards
1
Q
What type of plastics can be heated can be moulded into many different shapes and be reheated over and over again?
A
Thermoplastics
2
Q
Advantages of thermoplastics?
A
Easy to mould and form Low melting point Inexpensive Lightweight, versatile Recyclable Easy to print on Strong, tough, rigid, resists impacts and water, durable
3
Q
Pros and Cons of Styrofoam?
A
\+ Good for modelling-easy to carve-sanded to smooth finish-high compressive strength-rigid \+ Inexpensive \+ Easily glued \+ Painted - Weak - Surface breaks away easily- can't do fine detail - Doesn't mimic weight of product - Surface can be dinted when sanded down
4
Q
What’s PET?
Uses?
A
Polyethylene terephthalate Lightweight- low density Very tough Transparent Barrier to gases Doesn't flavour contents- non toxic
Drink bottles
Microwavable food trays
5
Q
What’s HDPE?
Uses?
A
High density polyethylene Lightweight- low density Very tough Rigid Hard wearing Decorative when coloured Barrier to gases, water Weather and chemical resistant
Bleach/detergents bottles
Thin packaging sheets
6
Q
What’s PVC?
Uses?
A
Polyvinyl chloride Lightweight- low density Very tough Very strong Rigid or flexible - versatile Clear appearance Barrier to gases Weather and chemical resistant Doesn't flavour contents- non toxic
Cosmetic products, food, toiletries, water and fruit packaging
7
Q
What’s LDPE?
Uses?
A
Low density polyethylene Very lightweight- low density Very tough Flexible Hard wearing Decorative when coloured Barrier to gases, water Weather and chemical resistant
Cling film, milk cartons labels
8
Q
What’s PP?
Uses?
A
Polypropylene Lightweight- low density Very tough Rigid or flexible - versatile Barrier to gases, water- low moisture absorption Weather and chemical resistant
Food packaging, yogurt pots, sweet wrappers
9
Q
What’s rigid PS?
Uses?
A
Polystyrene Lightweight- low density Low moisture absorption Transparent Rigid
Food packaging, CD cases
10
Q
What’s expanded PS?
Uses?
A
Polystyrene Lightweight- low density Low moisture absorption Durable Good impact resistance Insulated heat
Protecting fragile products, insulation, egg cartons
