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Natuurwetenskappe

Graad 5

Materiaal

Module 29

Eienskappe van materiale

Aktiwiteit:

Om die eienskappe van sekere materiale te ondersoek

[lu 1.1.3; 1.2; 1.3]

1. Polimere

‘n Mens kry natuurlike en mensgemaakte polimere. Proteïne, wat ‘n belangrike boustof in lewende organismes is, is ‘n voorbeeld van ‘n natuurlike polimeer. Sintetiese polimere is eers omtrent ‘n 100 jaar gelede ontdek. Toe was dit baie skaars en duur. Sintetiese polimere kan in twee groepe verdeel word, naamlik vesels en plastiek. Ons gaan hoofsaaklik kyk na plastiek.

Sintetiese Polimere: Plastiek

Plastiek kan helder of kleurvol wees en kan in enige fatsoen gevorm word.

Hoe word plastiek gemaak?

Olie kom diep onder die grond in sekere areas voor. Daar word diep in die grond af geboor om die olie na die oppervlak te bring. Hierdie olie is dik en swart en word ru-olie genoem.

Kyk na die onderstaande kaart en identifiseer die lande waar olie gevind word. Jy mag in ‘n groep werk.

Eksperiment:

Van olie tot plastiek

Kom ons doen ‘n eenvoudige eksperiment om te kyk deur watter proses ru-olie min of meer gaan in die vervaardiging van plastiek:

  • Verhit botter
  • Botter smelt
  • Botter verdeel in twee dele: een deel lig en wit, die ander deel swaar en geel

Wanneer ru-olie verhit word, gebeur min of meer dieselfde. Die ru-olie word na ‘n raffinadery geneem waar dit teen ‘n baie hoë temperatuur verhit word. Die olie verdeel in ligter en donkerder olie. Die ligte olie word gebruik om onder andere plastiek van te maak.

Gebruik van plastiek

Sekere plastiek is hard en word gebruik om tafels en stoele van te maak. Dit word ook toenemend gebruik om motoronderdele te vervaardig wat vroeër van staal gemaak is. Plastiek kan heelwat harder as staal wees.

Ander plastiek is sag en buigbaar. Hierdie plastiek word gebruik om goed soos inkopiesakkies, stortgordyne en reënjasse van te maak.

Plastiek word gebruik om houers vir die stoor van voedsel te maak. Baie produkte op die rakke in supermarkte word in plastiekhouers verpak.

Noem ‘n paar sulke produkte:

Watter rol speel plastiek in behuising?

In informele nedersettings vorm plastiek ook ‘n noodsaaklike deel in die oprigting van ‘n plakkershut. Het jy al waargeneem hoe plastiek benut word en waarom plastiek so ‘n belangrike rol speel? Sê hoe plastiek so ‘n huis teen die wisselende weersomstandighede kan beskerm.

Hoe word plastiek herwin en hoe word die plastiek weer in gebruik geneem? Soek inligting en gee skriftelike terugvoering:

Onthou: Plastiek kan en behoort herwin te word!

I nteressante feite:

Plastiek kan tien keer harder as staal wees en kan hoë temperature weerstaan.

Kredietkaarte word van plastiek gemaak; dit word in die plek van kontantgeld gebruik.

Chirurge gebruik plastiek om allerhande liggaamsdele te vervang, bv. hartkleppe, are, ens.

V oordele van plastiek:

Die gebruike van plastiek het baie werkgeleenthede vir mense in ons land geskep.

Die natuur kan nie genoeg katoen, wol, hout, ens. aan die mense verskaf nie. Dus moet ons van ander materiale soos plastiek gebruik maak.

N adele van plastiek:

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Natuurwetenskappe graad 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10980/1.2
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