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MHT-CET : Chemistry Entrance Exam

MHT - CET : Chemistry - Synthetic Fibres Page 1

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1.

Fibres

 

The thin filament-like substance, which can be woven into a fabric, are called fibres.

 

 

2.

Classification

 

Fibres are classified as:

  1. Natural
  2. Artificial
  1. Natural: They are again divided into two types:
    1. Cellulosic or Vegetable Fibres: They are derived from naturally occurring sources like plants.
      Cotton and linen are examples of products obtained from plant biosynthesis. Linen is stronger than pure cotton.
    2. Animal Fibres: They are obtained from animal biosources. Wool is a form of protein obtained from sheep. Silk is obtained from silkworm. It is a simple protein - fibroin.
  2. Artificial Fibres:
    1. Regenerated Fibres: Thes are fibres which are natural in origin but are pretreated so that they become stronger and last longer. Examples are viscose rayon, acetate rayon, etc.
    2. Synthetic Fibres: These fibres are prepared by the polmerisation method where simple, small molecules undergo polymerisation to give large molecular weight products. They undergo addition or condensation polymerisation. Example: nylon, terylene, etc.

 

 

3.

Nylon-6

 

It is a polyamide fibre. The monomer, -caprolactum, contains 6 carbon atoms and hence the name Nylon-6.

 

 

4.

Preparation of Nylon-6

 

 
                                                        or

e - caprolactum                      

 

 

5.

Nylon 6, 6

 

It is a polyamide fibre. The two raw materials, adipic acid and hexamethylene diamine, contain 6 carbon atoms, each. Hence, the name Nylon 6, 6.

 

 

6.

Preparation Of Nylon-6, 6

 

 

 

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