In this particular presentation you will learn about synthetic fibres and plastics introduction this is for class 8 science NCERT

1. Synthetic Fibres
and Plastic
Class 8
Chapter 3 NCERT
Science

2. content
Expression of Drift
Velocity
Drift Velocity
Relation between Current
&Drift Velocity

3. What are Synthetic
Fibres?
What is a synthetic fibre
made up of?

4. A synthetic fibre, as well as
plastic, is made up of a chain of
small units (called Monomers)
which combine to form polymers

5. Polymers:
Polymer is a Greek word in which
'poly' means 'many' and 'mer'
means units. Hence, polymers are
large molecule made up of several
molecules (or monomers) linked
together.

6. Monomers: A monomer is a
single molecule that can bond
with other identical molecules
to form polymers through a
process called Polymerization.

7. Example of Polymers:
• All synthetic fibres, such as Rayon
and Nylon, are polymers.
•
• Polymers are also found in
Nature. ‘Cotton’ is a polymer
called ‘Cellulose’. ‘Cellulose’ is
made up of a number of single
units (or monomers) called
‘Glucose’.

8. Polymerization Reaction: The
process of linking small
monomers together to form
polymers is called
Polymerization.

10. Types of Synthetic Fibres
• Rayon
• Nylon
• Polyester
• Acrylic

11. Rayon is a versatile fibre and can imitate
the feel and texture of silk, wool, cotton
and linen with drape and slipperiness akin
to nylon.

12. Why Rayon is called artificial silk?
Rayon resembles silk in appearance, texture and
shine. Hence, it is also known as Artificial Silk.
Silk fibre was discovered in China and made from
silkworms. It had a beautiful texture and was very
costly. By the end of the 19th century, scientists
managed to make an artificial silk-like fibre made by
treating wood pulp chemically

13. Uses of Rayon
This man-made fibre uses natural material
(wood pulp) and can be woven like silk fibre. It
is cheaper than silk and can be dyed in a
variety of colours. It can be:

14. Uses of Rayon
Make apparels like suits, slacks, jackets etc.
Make automobile tyre cords (because of its strength)
Mixed with cotton to make bedsheets and bedspreads
Mixed with wool to make carpets and blankets
Used to make other home furnishings, such as curtains
and tablecloths

15. Nylon
Nylon is the first synthetic fibre to be prepared
without using any natural raw materials
(materials produced by plants and animals).

16. Which properties make Nylon suitable for:
Making Ropes used for Rock Climbing: Strong
fibre, Lightweight, Weather Resistant
Making Fishing Nets: Strong, Elastic, Water
Resistant
Making Tents: Strong, Light, Does Not Absorb
Much Water, Dries Quickly

17. Uses of Nylon
Developed in 1931, this thermoplastic silky material is strong,
elastic, light, lustrous and easy to wash. A nylon thread is, in fact,
stronger than a steel wire. Hence, it is used to:
Make clothes (including socks)
Make parachutes as well as ropes for rock climbing
Make ropes, toothbrushes, and car seat belts etc.
Make tents, curtains, and sleeping bags

18. Thank
your

24. Relation between drift velocity and
electric current
Consider a conducting wire of lenght L and
having uniform cross-section area A in
which electric field is present

26. S W
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28. Part two

29. 1
2
3
Within you I lose myself,
without you I find myself
wanting
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without you I find myself
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without you I find myself
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30. TEXT HERE TITLE HERE TITLE HERE
Within you I lose
myself, without you I
find myself wanting
to be lost again.
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31. TEXT
1
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Within you I lose
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32. Within you I lose myself,
without you I find myself
wanting to be lost again.
a
Within you I lose myself,
without you I find myself
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b
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33. Part three

34. Within you I lose myself
Within you I lose myself
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35. ADD YOUR
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37. TEA
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38. Part four

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