Synthetic Fibres

Question 1 What is a polymer?

Question 2 Name the natural polymer from which cotton is made?

Question 3 Name the units of which cellulose polymer is made?

Question 4 Define the term monomer?

Question 5 What are fibres?

Question 6 What are natural polymers. Give example?

Question 7 What are synthetic polymers. Give example?

Synthetic Fibres and Plastics

A very thin thread like strand from which cloth is made is called a fibre.

Fabric is made by weaving or knitting long, twisted threads called yarn made from fibres.

The clothes we wear are made of fabrics.

The fibres can be divided into 2 groups:

1)Natural fibres: The fibres obtained from plants and animals.

For Example : Cotton,flax,jute,wool,silk.

2)Synthetic fibres: They are made by human beings.

For Example : Rayon,nylon,polyester,acrylic etc.

A polymer is a very big molecule formed by the combination of a large number of small molecules.

The small molecules which join together to form a polymer is called monomer. The monomer which make a polymer may be of the same compound or of different  compounds.

Polymers are of 2 types:

1)Natural polymers: Cotton, wool, silk.

Cotton fibre is made of a natural polymer called cellulose.

Cellulose is a polymer which is made up of a large number of small glucose molecules joined one after the other. The walls of all plants cells are made up of cellulose.

2)Synthetic polymer: Nylon, polyester, acrylic, poly ethene, polyvinylchloride, bakelite, melamine.

Nylon fibres is made of up nylon polymer in which two different types of molecules are combined alternately to form long chains.

Other Notes from Chapter 3 Synthetic Fibres and Plastics

• Synthetic Fibres
• Types of synthetic fibres
• Rayon
• Nylon
• Polyester
• Poly Ethylene Terephthalate and Acrylic
• Characteristics of Synthetic Fibres
• Plastics
• Types of plastics
• Properties of plastics
• Biodegradable and Non-biodegradable material
• Harmful effects of Plastics
• Steps to save environment from plastic waste