4. properties function plastics
TRANSCRIPT
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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