I, ______________, hereby declare that the Project Report titled “TO PREPARE THE RAYON THREADS” is an authentic work done by me.
(i) To prepare cuprammonium hydroxide solution :
Weigh about 20 g. of crystalline. copper sulphate in a clean watch glass dissolve it in 100 ml of water taken in beaker. Add dil NaoH solution to this solution. Filter the precipitate and wash them with water and test the filtrate with Bacl2 solution to indicate presence of sulphate ions. Now add 50 ml. ammonia solution into precipitate. This is solvent for dissolving cellulose.
(ii) Dissolving the cellulose matter :
Add I gm of ordinary filter paper to the cuprammonium solution taken in conical flask close the flask with rubber stopper and allow it to stand for 3-4 days. In this time, filter paper completely dissolved leaving a viscous solution called viscose.
(iii) Formation of rayon filaments :
The viscose solution is taken in a syringe. Then the nozzle of the syringe is dipped in 5 m. H2SO4 solution. Squeeze out the viscose into the acid and at the same time keep on moving the nozzle in the acid solution long filaments of rayon will be formed in the Beaker the acid bath is left undisturbed for 24 hours until the blue colour of rayon filament change to white then rayon thread removed from acid bath and washed with water and dried up the threads.
1. New Fundamental Physics
2. Pradeep’s New Course Physics
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