June 2012 Polymerisation AIM to explain how the properties of alkenes allow polymerisation Key words monomer one unit in a chain polymer many units joined together Poly ethene ID: 369166
Download Presentation The PPT/PDF document "21 st" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
21st June 2012Polymerisation
AIM – to explain how the properties of alkenes allow polymerisation Slide2
Key wordsmonomer – one unit in a chain
polymer – many units joined togetherSlide3
Poly(ethene) (polythene or polyethylene)
This
is an example of
addition polymerisation
.
During the polymerisation of ethene, thousands of ethene molecules join together to make poly(ethene) - commonly called polythene.Slide4
Poly(propene) (polypropylene): PPSlide5
In an equation form, this is normally written as:Slide6
Poly(chloroethene) (polyvinyl chloride): PVC
Poly(
chloroethene
) is made by polymerising
chloroethene
, CH2=CHCl. Slide7
The equation is usually written
It doesn't matter which carbon you attach the chlorine to in the original molecule. Just be consistent on both sides of the equation.Slide8
Poly(tetrafluoroethene): PTFE
You may have come across this under the brand names of Teflon or
Fluon
.
PTFE
is just like poly(ethene) except that each hydrogen in the structure is replaced by a fluorine atom.