C1e-designer Polymers Flashcards Preview

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Flashcards in C1e-designer Polymers Deck (18)
1

What properties do plastic bags and squeezy bottles need?

Light
Stretchable

2

What properties do window frames and piping have?

Strong
Durable

3

What is polystyrene foam used in?

Packaging to protect breakable things
Disposable coffee cups (thermal insulator)

4

What are the atoms in plastics held together by?

Strong covalent bonds

5

What kind of melting points do plastics with weak intermolecular forces between polymer molecules have?

Low melting points

6

Why can some plastics be stretched easily?

Weak intermolecular forces between polymer molecules
Polymer molecules can slide over one another

7

What kind of melting points do plastics with strong forces between polymer molecules have?

High melting points

8

Why are some plastics rigid and cannot be stretched?

Strong bonds (covalent bonds/cross linking bridges) between chains
Crosslinks hold chains firmly together

9

What are the properties of nylon?

Tough
Lightweight
Keeps water out
Keeps UV light out
Doesn't let water vapour through
Sweat condenses

10

What are the properties of GORE-TEX?

Tough
Lightweight
Keeps water out
Keeps UV light out
Breathable

11

How does GORE-TEX help active outdoor people?

If they sweat water vapour can escape
No condensation
Breathable

12

How is GORE-TEX waterproof and breathable?

Nylon laminated with PTFE
Holes in membrane too small for water to pass through
But big enough for water vapour to pass through
Membrane fragile on its own so combined with nylon

13

What is non biodegradable?

Will not decay or decompose by bacterial action

14

How can waste polymers be disposed of?

Use of landfill sites
Burning
Recycling

15

Why are chemists developing polymers that are biodegradable and dissolve?

So plastic thrown away breaks down/dissolves instead of sitting in landfill for a long time or being burnt

16

What are the difficulties with recycling plastics?

Sorting out different plastics is difficult
Expensive

17

What is the problem with burning plastics?

Release gases such as sulfur dioxide and other poisonous gases
Waste of plastic

18

What properties do plastic milk bottles need?

Strong
Rigid