4. Properties Function Plastics

8/18/2019 4. Properties Function Plastics

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Plastic

Can you think of advantages or disadvantages of

using plastics in our daily lives?

Can you name different products made out of plastic ?


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Plastics

Task – name 10 objects made of plastic that is in close proximity to you


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Plastic

! ho" do "e use plastics in our homes?

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http://www.bodieandfou.com/http://www.bodieandfou.com/


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! Thermoplastics

Plastic

This material is man made and is a by

product of the oil industry

There are two types of plastic #

! Thermosetting


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These are described as plastics that can

be reformed using heat # this plastic hasa memory$ it returns to its original flatshape "hen re%heated

&ere are some examples and their uses #

Acrylic – available in almost any colour in sheetrod or tube form$ can be shaped using a linebender or vacuum former.

ABS – a very commonly used plastic can be injection moulded from a po"der form

Thermoplastics materials

Styrene – very good for vacuum forming

thermoplastic resin

Polypropylene

'()


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Polyester resin – poured into moulds to

make products or for boat repair

Thermosetting materials

These are described as plastics that do

not reform using heat$ they *)+T,and cannot be reshaped

Urea formaldehyde – electric plugsand sockets

Melamine – kitchen "orktops$

unbreakable drink mugs

&ere are some examples and their uses #

&arry 'llen-s paper "eight.doorstop

made from resin

/ettle saucepan handles


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aterials – PlasticsPlastics are synthetic resinous substances that can be moulded with the help of heat or pressure.There are two main classes of plastics:! Thermosetting – plastics that can only be heated and be moulded once f re%heated they cannot soften

! Thermoplastics – plastics that are moulded by heating and can be remoulded if heated again.

Thermoplastics soften "hen heated and can be shaped "hen hot The plastic "ill harden

as it cools do"n

Thermoplastic Thermoplasticproperties

Thermoplastic uses !ample outcomes

Acrylics or Perspe!"Polymethyl

Methacrylate#

)tiff$ hard$ shiny$ brittle insmall sections$ durable$

scratches easily$ availablein different colours$ good

electrical insulator

2sed for signs$ key rings$lighting$ storage containers

$igh impact polystyrene"$%PS#

3ight but strong plastic$available in sheets in a

variety of thicknesses andcolours and softens at

about 45 degrees

2sed for vacuum forming andmaking outer casings andpackaging for products

Acetate &ard$ shiny andtranslucent.transparent

2sed in badge%making$packaging and for overhead

projector transparencies

!panded polystyrene"styrofoam#

6hite$ light"eight andcrumbly

2sed for protective orinsulating packaging

aterials % Plastics


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aterials – PlasticsThermoplastic Thermoplasticproperties Thermoplastic uses !ample outcomesPolypropylene "PP# 3ight$ hard$ flexible but

can scratch easily 7urableto "ear and has good

resistance to chemicals

2sed for different kinds ofpackaging$ chairs$

gadgets$ textiles andautomotive components

&ow densitypolyethylene "&'P#

)oft$ flexible$ goodresistance to chemicals$good electrical insulator$

tough

2sed for packaging film$carrier bags$ bottles$ toys

$igh density

polyethylene "$'P#

&ard$ stiff and strong 'ble

to be sterilised

2sed for plastic bottles$

tubing and householde8uipment

(orrugated plastic 3ight"eight$ rigid and"eatherproof

2sed for sign boards andfolders

&ow)tac* mas*ing film 9lexible and transparent 2sed to position sticky%backed vinyl letters orimages onto a chosen

surface 2sed for creatingsigns$ stencils and vehicle

signage

Polyvinyl chloride "P+(# )tiff$ hard "earing$ brittlebut can be treated to

make it softer and more

rubbery

2sed for blister packs$"indo" frames$ records

and clothing

aterials % Plastics


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t-s just another plastic bag:


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Are there any problems or issues with using

carrier bags ,

Tas* 1 – in smalls group$ list three advantagesand disadvantages of using carrier bags

Tas* ; – in your group consider two "ays of

improving any problems that you have identified


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&o" many supermarket carrier bag does the

average shopper use to carry goods home every

"eek?

)upermarkets hand out 10)hopperbags


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- million mobile phones are e!pected to go on

the scrapheap during a (hristmas period.

million people e!pect to get a newmobile phone over (hristmas in the U/

0hat can be done to improve this,

0hat happened to your old mobile phone,

1ust one more phone 2it won3t matter.


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Plastic and sustainability aspects

(efore "e use plastic materials aspects for consideration

Plastic is a precious resource made

from oil (ecause it is such a versatile

material$ "e use it a lot

; 3ist 5 plastic products that no%one

should ever bothered making

6orking in small groups – discuss the

follo"ing and feed back to the class

3ist 5 plastic products that "ould be

better made from a different materials

1 3ist 5 products "here plastic is the

best material to use

Photographs courtesy of photo gallery "ales

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4. Properties Function Plastics