C4: Polymer Flashcards
(22 cards)
what is polymer
polymer is a long chain molecule that is made up from a combination of many repeating basic units
what is monomer of natural rubber
isoprene
thermoplastic
- can be remoulded repeatedly upon heating
- can be recycled
- melt when heated, solidify when cooled
exp of thermoplastic
- polystyrene
- polyvinyl chloride (PVC)
- nylon
thermoset
- cannot be remoulded after heating
- normally disintegrate or burn upon heating
- cannot be recyled
exp of thermoset
- melamine
- bakelite
elastomer
- high elasticity
- can be stretched and return to its original shape when released
exp of elastomer
- polyurethene
- styrene-butadiene rubber (SBR)
characteristic of polystyrene
- light and heat insulator
characteristic and uses of polypropene
- durable
- toys and textile
characteristic and uses of polyethene
- strong and durable
- plastic bag and bottle
characteristic and uses of polychloroethene
- polyvinyl chloride (PVC)
- strong and hard
- water pipes
- electrical insulator
condensation polymerisation reaction to produce terylene
1,2-ethanediol + terephthalic acid
–> terylene + water
condensation polymerisation reaction to produce nylon
1,6-haxanediamine + decanedioyl dichloride
–> nylon _+ hydrochloride
characteristics of neoprene
- polychloroprene
- high heat resistance
- oxidation resistance
- flame resistance
uses of neoprene
- petrol rubber hoses
- gloves
characteristics of styrene-butadiene rubber (SBR)
- abrasion resistance
- high heat resistance
uses of SBR
- tyres
- shoe soles
- coated fabrics
characteristic of silicone rubber
- high temperature resistance
- inert
uses of silicone rubber
- medical implants
- cooking utensils
- automotive components
what synthetic rubber are oil and solvent resistence
- thiokol
- nitrile rubber
3 alternative vulcanisation methods
- metal oxide
- radiation (gamma ray)
- peroxide (hydrogen)
