Polymers Flashcards
What is the example of a weak force polymer?
Thermo softening polymer
Why are thermo softening polymers weak forced?
Thermo softening polymers don’t have cross links between chains
How awesome are softening polymers weak because they don’t have cross links between chains?
The forces between the chains are really easy to overcome so it’s easy to melt the plastic. When it cools the polymer hardens into a new shape. You come out these plastics and remould them as tiny as you like.
Describe the structure of strong forces in polymers
Some plastics have stronger intermolecular forces between the polymer chains called cross links that hold the chains firmly together
What is an example of a strong force polymer?
A thermosetting polymer
Why di Thermo softening polymers have strong forces because they have Crosslinks?
These cross links hold the chains together in a solid structure. The Polymer doesn’t soften when it’s heated. thermosetting polymer is a strong hard and rigid
What two factors can effect the properties of a polymer
- The starting materials
- reaction conditions
What two types of polythene can be made using different conditions?
- lower density polythene
- high density polythene
How is low density polythene made?
Low-density polyethylene is made by heating ethane to about 200°C under high pressure
How is high density polythene made?
High density polythene is made at a lower temperature and pressure with a catalyst
What is Low density polythene used for and why?
- bags and bottles because it’s flexible
What is high density polythene made for and why?
What are tanks and drainpipes because it’s more rigid
What does the plastics melting point to tell you about the forces between the polymer chains?
The higher the melting point the stronger forces holding the polymer chains together
What are intermolecular forces between polymer chains called?
Cross links
Give two things that can effect the properties of a polymer
The starting materials and the reaction conditions
