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dt > polymers > Flashcards

polymers Flashcards

1
Q

what are the 3 types of polymers

A

thermoplastics
thermosetting plastics
elastomers

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2
Q

thermoset plastics

A

Urea formaldehyde
melamine formaldehyde
polyester resin
epoxy resin

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3
Q

thermo plastics

A

low density polyethylene LDPE
high density polyethylene HDPE
polypropylene PP
high impact polystyrene HIPS
acrylonitrile butadiene styrene ABS
polymethyl-methacrylate PMMA
nylon
rigid polyvinyl chloride uPVC
flexible polyvinyl chloride PVC

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4
Q

Elastomers

A

natural rubber
butadiene rubber
neoprene
silicone

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5
Q

natural rubber

A

high tensile strength, good hardness, is tough and an electrical insulator, also good cold res

uses - tubes and hoses

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6
Q

Butadiene rubber

A

tough, excellent wear res, good thermal res against friction, is an electrical insulator

uses - vehicle tyres and conveyor belts

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7
Q

neoprene

A

good thermal, oil and chemical res, excellent weather res, tough, good abvrasion res and is an electrical insulator

uses - laptop cases andhose covers

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8
Q

silicone

A

good flexibility at low temps, good thermal and weather res and is a electrical conductor

uses - bakeware and machinery lubricants

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9
Q

Urea formaldehyde

A

hard and brittle, heat res and a good electrical insulator

uses - electrical fittings and adhesives

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10
Q

Melamine formaldehyde

A

hard and tough, heat and chemical res making it food safe

uses - buttons, decorative laminates

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11
Q

polyester resin

A

heat and chemical res, brittle and rigid

uses - castings and car parts

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12
Q

epoxy resin

A

chemical res, is hard and tough, clear and rigid

uses - adhesives, and surface coatings

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13
Q

LDPE

A

weather proof and has good chemical res, is also very tough

uses - toys, carrier bags and general packaging

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14
Q

HDPE

A

weatherproof and is good chemical res, is tough

uses - jerry cans, toys

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15
Q

PP

A

good chemical and fatigue res, is tough

uses - rope, food containers

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16
Q

HIPS

A

is hard and tough, is rigid

uses - drink cups and yoghurt pots

17
Q

ABS

A

extremely tough and is hard

uses - handles and telephone handsets

18
Q

PMMA

A

is tough and hard and has a good chemical res

uses - car light casings

19
Q

Nylon

A

tough and is corrosion res and has a good temp res

uses bearing and gears

20
Q

uPVC

A

rigid, opaque is hard and tough, good weathering and chemical res and is fire retardant

uses - window frames

21
Q

PVC

A

can be translucent, is tough and flexible, has good weathering and chemical res

uses - hose pipes

dt (13 decks)

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