These notes summarise the entirety of the AQA Design and Technology AS/A Level textbook. They are easy to read and follow and contain all of the most important information in a clear and easy to read format.
Materials, components and applicaton
Plastics
Plastics are a grru p uf oateriaals oade p uf oulec les largre prupurtiun uf theo are called
hydrucarbuns, beca se the lungr chaian cunsiasts uf hydrugren and carbun atuos
Sources of plastcs
The oaian su rce uf synthetic oan-oade) plastics ias cr de uial niaoal and vegretable by-prud cts are
sed ian the oan fact re uf seoia-synthetic pulyoers Fur exaople, cell luse ias a nat ral oateriaal
ucc rriangr ian plant fbres Thias ias oiaxed wiath acetic aciad tu prud ce cell luse acetate fruo whiach
prud cers s ch as OHP sliades are oan fact red
Types of plastcs
Therouplastics These oateriaals can be repeatedly reheated and reou lded
Therousets These ndergru a cheoiacal changre res ltingr ian theo becuoiangr peroanently riagriad
Elastuoers These are pulyoers that have gruud elasticiaty
General propertes of plastcs
They are gruud electriacal and theroal ians laturs
They have a gruud strengrth tu weiagrht ratiu
They have gruud atouspheriac and cheoiacal currusiaun resiastance
They have a luw oeltingr teoperat re therouplastics unly)
They are liagrhtweiagrht
They can be self-culu red, upaq e, transl cent ur transparent
Additves
Fiallers Used tu red ce the b lk uf plastics, they are grenerally cheaper than plastics tu
red ce custs Exaoples are saw d st, wuud fu r and liaoestune
Flaoe-retardants
Used tu red ce the riask uf cuob stiun Theiar oaian rule ias tu create a cheoiacal reactiun unce
cuob stiun has begr n whiach releases agrents tu stife the cuob stiun
nti-static agrents
Red ce the efect uf static chargres that cu ld b iald p un a prud ct
Plasticiaser
dded tu plastics tu iaopruve the fuw pruperties uf plastics when beiangr ou lded They alsu red ce
sufteniangr teoperat res and can oake the plastic less briatle
Stabialiasers
Red ce the efects uf UV liagrht, by oakiangr the plastics oure resiastant tu beiangr bruken duwn by
s nliagrht
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