Plastics - PowerPoint PPT Presentation

Loading...

PPT – Plastics PowerPoint presentation | free to download - id: 76cb6a-MGYwZ



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Plastics

Description:

TOPIC 13 Plastics Plastics A plastic is a substance which can be shaped or moulded. The Raw Material for plastics is Crude Oil. Plastics are types of polymers. – PowerPoint PPT presentation

Number of Views:95
Avg rating:3.0/5.0
Slides: 8
Provided by: Resear114
Learn more at: http://www.calderglen.s-lanark.sch.uk
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Plastics


1
TOPIC 13
Plastics
2
Plastics
  • A plastic is a substance which can be shaped or
    moulded.
  • The Raw Material for plastics is Crude Oil.
  • Plastics are types of polymers.

3
Polymerisation
  • Polymers are long chain molecules made up by many
    small individual building blocks,called Monomers,
    joining together.

Monomers
Polymer Molecule
4
Addition Polymers
For an Addition Polymer to be formed the monomers
must have a CC double bond.
Examples Polythene Made from many ethene
molecules joining together.
CH2CH2 CH2CH2 CH2CH2
(ethene)
(Polythene)
-(CH2-CH2-CH2-CH2-CH2-CH2)n-
5
Other examples of Monomers
  • Polychloroethene (better known as PVC, polyvinyl
    chloride)
  • CH2CHCl

Polytetrafluoroethene (PTFE) i.e. Teflon
CF2CF2
Polyphenylethene (polystyrene)
CH2CHC6H5
6
Recycling Plastics
  • Plastics can be difficult to Recycle.
  • Some plastics can be melted and reshaped, however
    others cant.
  • Plastics are said to be Non-Biodegradable ie.
    They cannot be broken down by Bacteria in the
    soil.
  • Plastics can give off poisonous fumes such as CO,
    HCN and HCl when burned.

7
Effect of Heat on Polymers
  • Polymers that soften on heating are called
    Thermoplastic. Examples are Polythene, PVC,
    polypropene etc.
  • Some polymers are largely unaffected by heating /
    do not soften on heating. These are known as
    Thermosetting Polymers. Their Structure is such
    that they contain Cross-Links between the long
    polymer chains. Examples are Bakelite and Mica.
About PowerShow.com