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PD > Plastics > Flashcards

Plastics Flashcards

1
Q

What is the molecular structure of thermo plastic.

A
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2
Q

In a polymer chain what is one circle thing called.

A

A monomer

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3
Q

What are the 4 properties of thermoplastics

A

Remouldable

Recyclable

Self Coloured

Self Finishing

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4
Q

What symbol do all thermo plastics have

A

The three arrow triangle recyclable with the number in the center and a letter below representing the plastic.

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5
Q

How long does it take for a thermo plastic to degrade

A

100+ years

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6
Q

What plastic is Lego made of

A

ABS

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7
Q

What does ABS make

A

High quality toys

mobile phones

Safety helmets

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8
Q

What are the three main properties of ABS

A

Hard

strong

durable

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9
Q

What is the negative point of ABS

A

expensive

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10
Q

What plastic is a bottle made of

A

PET

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11
Q

What are the two good points of PET

A

It can be compleatly clear

and it is strong when thin

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12
Q

What is the bad point of PET

A

It has a cheap crinkly feel

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13
Q

What is a sandwhich box made of and why

A

Polypropylene because it is soft tough and supple and it can have integral hinges

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14
Q

What does HIPS stand for

A

High impact polystyrene

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15
Q

What does LDPE and HDPE stand for

A

Low Density Poly-Ethylene

and

High Density Poly-Ethylene

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16
Q

What is a plastic bag made of and why

A

LDPE because in is encredable strong when extramly thin. and it can be made 0.1mm thick

17
Q

What can polystyrene be used to make.

A

Yogurt pots and dispoable food containers.

18
Q

What is the stock forms of plastic

A

Sheets tubes and granules

19
Q

Name the 4 additives and what they do

A

Platicizer=changes natural properties and makes it easyer to process

Filler=replaces polymer and reduces cost

stabilizer=stop deterioriating over time

bio batch=make thermo polymers biodegrade in less then 5 years

20
Q

What is line bending

A

lie acrylic over simple heating element until hot and bend ovver a mould or jig.

21
Q

What is drape moulding

A

Heat plastic to 150degrees not molten drape over simple wooden mold.

22
Q

What is vacuum forming

A
23
Q

What is injecton moulding

A

Heat plastic granuals

push in to mold make solid shape

24
Q

What is blow moulding

A

Plastic tube is inserted in to mould blow high presure air into the tube to make product

25
Q

What is extrution moulding and what is it used for

A

Heat plastic push through mould make tube

Used to make straws, hoses

26
Q

What is rotatinal moulding and what is it used for

A

Moulten plastic put on mould surounded by heater and this is spun to make hollow object.

used to make cheap balls.

27
Q

what is the molecular structure of thermosetting plastic

A
28
Q

5 properties of thermorsetting plastic

A

no remouldable or recyclable

self colouring or painted

self finishing

do not melt

29
Q

What plastic makes electrical fittings and why

A

Urea Formaldehyde it is a good electrical insulator and it is strong

30
Q

what is Melamine formaldehyde used to make and why

A

Heat resistence surfeces

resists some chemicals and stains

31
Q

What is Polyester resin used to make and why

A

Glass renforced plastic

hard, brittle unless laminated, good electrical insulator, resists chemicals well

32
Q

what is compression moulding

A

block of soft plastic in female mould former is pushed in to make product,

33
Q

What is calendaring

A

A series of rollers that stretch the plastic in to a thing strip

34
Q

What does TPE stand for and what is it used to make

A

TPE=thermo plastic elastomer

Its an elastomer

Has no crosslinks

used for ergonomic over grips

35
Q

What does LSR stand for and what is it used for

A

Liquid silicone rubber

Its an elastomer

Used for cook ware

36
Q

what is BioPol PLA

A

Its makes plastic brake down in 6 months often used in place of ABS can be soft like LDPE used in medical implants

37
Q

What is Lactel what is it used for

A

Its used for slow release medical capsules and dishwasher tablets

It is an water absorbing soluble polymer breaks down in mins

PD (2 decks)

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