8.7 Specialised Polymers 8.7.1 Kevlar LO: I understand how the uses of kevlar are related to its properties.

8.7 Specialised Polymers

8.7.1 Kevlar

LO: I understand how the uses of kevlar are related to its properties

Kevlar is a .

The linear chains of kevlar are held together by bonding.

Properties:• light weight• strong• durable

Uses:• bullet-proof vests• crash helmets• spacesuits

LO: I understand how the uses of kevlar are related to its properties

polyamide

hydrogen

8.7.2 Polyethenol

LO: I understand how the properties of polyethenol relate to its uses.

Polyethenol is a polymer

The solubility of polyethenol can be varied by changing the number of groups present.

This happens in a process called . .

Uses of polyethenol:• surgical stitches• hospital laundry bags

LO: I understand how the properties of polyethenol relate to its uses.

ester exchange

water soluble

hydroxyl

esterexchang

e

8.7.3 Polyethyne

LO: I understand how polyethyne conducts electricity.

Polyethyne is an electrical .

It’s conductivity is the result of . electrons that can move along the carbon chain.

C

CC

CC

CC

CC

CC

C

H H

H H

H

H

H

H

H

H

H

H

LO: I understand how polyethyne conducts electricity.

conductor

delocalised