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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

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
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
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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