C4 - Material choices Flashcards
How many monomers are used in condensation polymerisation
2
What is the functional group for carboxylic acid
O
!!
C
!
OH (cooh)
Functional group for alcohol
OH
What is taken from the carboxylic acid for condensation polymerisation to happen
the OH of the COOH
What is taken from the alcohol for condensation polymerisation to happen
The H of the OH
What does the H and the OH from each functional group create in condensation polymerisation?
Water molecule
Why are polymers formed from condensation polymerisation biodegradable
Because bacteria can break down the ester link
What is the ester link?
O
!!
C – O
What is the melting point of giant covalent structures
Very high
Why dont giant covalent structures conduct electricity
Because there are no free electrons or ions
Why can graphite be rubbed onto paper
Because of the weak forces between layers
What is graphene
A single sheet of graphite
What properties do crosslinks in polymers cause
Don’t soften when heated
They are strong
They are hard
They are stiff
What size are nanoparticles
1-100nm
What are 4 uses of nanoparticles`
Catalysts
Nanomedicine
Electric circuits
Antimicrobial - silver
