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7th Class Science Fibers and Fabric Manmade Fibres or Synthetic Fibres

Manmade Fibres or Synthetic Fibres

Category : 7th Class

*     Manmade Fibres or Synthetic Fibres

 

Manmade fibres are the composition of chemicals. Nylon, Acetate, Polyester, and Rayon are the example of manmade or artificial fibres. The chemicals required for the making of nylon are dichloride and diaminohexane. These two chemicals are required in the ratio of 2:5. In other words, for every 5ml of hexanedioyl dichloride, 2ml of diaminohexane is required. The resulting solution will make about 1/2 to 1 meter of nylon. Rayon is made from cellulose.

Acetate Fibres are used for the making of wearable dresses. It can be dyed in different colors. Cloths, made up of acetate Fibres, are smooth like silk. Acetate Fibres do not absorb moisture and dry fast.

Polyesters are hard Fibres. Polyester also refers to the various polymers in which the backbones are formed by the esterification, condensation of polyfunctional alcohols and acids.

 

*            Look at the following flow chart  

 

                   

 

 

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       Which one of the following fiber does not absorb moisture and dry fast?

(a) Cotton

(b) Wool

(c) Acetate

(d) All of these

(e) None of these

 

Answer; (c)

 

  

       Which one of the following is a synthetic fiber?

(a) Rayon

(b) Cotton

(c) Wool

(d) All of these

(e) None of these

 

Answer: (a)

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