Ploymers Flashcards
what is addition polymerisation?
molecules don’t loose anything; bonds break and join
what is the monomer for polyethylene
ethene
what is low density polyethylene
lots of branching
properties of low density polyethylene
chemically unreactive
electrical insulator
transparent + flexible
example of low density polyethylene
shopping bag
what is high density polyethylene
linear and tightly packed
properties of high density polyethylene
chemically unreactive
electrical insulator
rigid
higher melting point
example of high density polyethylene
pipes
what is the monomer for polyvinyl chloride
chloroethene
properties of polyvinyl chloride
rigid
brittle
example of polyvinyl chloride
bank cards
why is polyvinyl chloride more rigid and brittle
Cl atoms are large creating stronger intermolecular forces
what is the monomer for polystyrene
ethenylbenzene
properties of crystal polystyrene
rigid
transparent
use of crystal polystyrene
plastic cups
properties of expanded polystyrene
heat + sound insulation
opaque
light
example of expanded polystyrene
styrofoam cups
what is the different between crystal and expanded polystyrene
expanded polystyrene has N2 gas pockets
what is the monomer for polytetrafluroethene
tetrafluroethene
properties of polytetrefluroethene
rigid
heat resistant
non-stick
example of polytetrafluroethene
non-stick frypans
what is condensation polymerisation
condensation with water / ammonia by-poduct
what do monomers of condensation polymers usually look like
has a functional group on each side
functional groups of Nylon-6,6
carboxylic acid + amine
