Polymer

Question 1

Stock form

6

Answer 1

Granules - small particles

Sheet - large flat section vary thickness

Film - very thin sheet

Rods, tubes bars - rods and extruded forms, can be specific design like curtain rail

Foam - solid form made by including air and other gases

Powder - very fine granule

Question 2

CH
How made
Degradation
3 types of poly
 finish

Answer 2

Made by fractional distillation
Synthetic pilmer made from crude oilz takes 100 years to destroy
Self finish. Can be pigmented during manufacture
Thermoplastic - can be reheated and reshaped repeatedly
Thermoset - when heated, undergoes chemical changes where molecules form rigid cross links. Cannot be reheated and reshaped
Elastomer - can be deformed under pressure, then when released, will return to its original shape

Question 3

Thermoplastics main
PP
HIPS
ABS
acrylic or PMMA
( AI means available in)

Answer 3

PP - rope, folders, med equipment, food containers
Tough, comes in translucent
Good chem Res, good fatigue Res

HIPS - yogurt pots, toilet seats, instrument control knobs, single user cup,
Hard rigid tough, AI translucent

ABS - telephones, luggage, domestic appliances, computer, calculator, control remote cases
Tough hard, AI opaque

acrylic or PMMA - car light casing, laser cut stuff, lighting units, lighting covers, baths
Tough, hard AI translucent
Good chemical res

Question 4

Thermoplastics S
LDPE
HDPE
nylon
uPVC
PVC

Answer 4

Low density polyethylene - detergent bottles, toys, carrier bags, food wrap film, good trays, toys, general packaging
Very tough, AI translucent
Weatherproof, good chem res

HDPE - chemical drums, Jerry cans, buckets, long life carrier bags, kitchenware, bowls
Tough AI translucent
Weatherproof, good chem Res

Nylon - bearings, gears, curtain rails, car engine manifold, cable ties
Tough
Corrosion Res, good temp Res, low coefficient of friction

Rigid PVC - window frames, external doors, guttering, bank cards
Rigid opaque tough hard
Good chem and weathering res

Flexible PVC - inflatable products, hose pipes, seat coverings, cable insulation
Tough
Flexible, good weather and chem res

Question 5

Thermoset p main
UF
Epoxy resin

Answer 5

Urea formaldehyde - electrical fittings, adhesives
Hard
G Heat and electrical resistant, brittle

Epoxy resin - adhesives, aerospace applications, surface coatings, aerospace applications
hard, tough, chem res, rigid, clear

Question 6

Thermoset p S
MF
Polyester resin

Answer 6

Melamine formaldehyde - decorative laminates, picnic waste, buttons
Hard tough chem res
HEAT res, FOOD safe, opaque

Polyester resin - used in GRP layup process for boat hulls, car parts, chair seats, castings
Rigid, brittle, heat and chem res

Question 7

Elastomer M
Natural rubber
Neoprene

Answer 7

Natural rubber - tyres, tubes, hoses, belts, balloons, toys, footwear
Hard, tough, elec insulator
High tensile strength, low elongation, cold resistant

Neoprene - wetsuits, industrial wire insulation, in cars eg shock absorber seals, hose covers, transmission belts, door seals
Good thermal, oil, chemical, abrasion, weather resistance. Tough, electric insulator,

Question 8

Elastomer S
Butadiene rubber BR
silicone

Answer 8

BR - tyres, conveyor belts, shoe soles, hoses
Tough, electrical insulator
Excellent Wear and Thermal res against FRICTION, tough,

Silicone - flexible ice cube trays, tubing for delivery of medical drugs, lubricant, seals for refrigerators, machinery lubricant
Electrical insulator
Good FLEXIBILITY at low temps, poor abrasion res, good thermal res to EXTREME temps, good weather res, good LUBRICANT