CBSE Class XII practical project on Rayon threads

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Information about CBSE Class XII practical project on Rayon threads

Published on February 15, 2014

Author: pranav_gh


Project prepared by: PRANAV GHILDIYAL 10


__________________ __________________ ACKNoWLEDGEMENT This word acknowledgement is to express my deep sense of gratitude towards those unseen hands which are my teacher Mrs. H. JADHAV (CHEMISTRY), our principal Ms. N. GEETHA RAO and my Parents who gave me the golden opportunity to do this wonderful project on the fore mentioned topic without their contribution the successful completion of this project would not have materialized. The project helped me in doing a lot of Research and I came to know 10

about so many new things I am really thankful to all of them for assisting me and helping me finish this project in the limited time I had. SINCERELY PRANAV GHILDIYAL AIM OF THE PROJECT:To prepare a sample of cuprammonium rayon threads from filter paper. APPRATUS REQUIRED : Conical flask (preferably 250mL )  Funnel 10

 Glass rod  Beaker (preferably 250mL )  Water bath  Filter paper ( Preferably whatman paper or else ordinary filter paper sheets) CHEMICALS REQUIRED : CuS04  NaOH solution.  Liquor ammonia solution  Dilute H2S04  Whatman paper  Distilled H20 10

BACKGROUND :Rayon is a synthetic fiber produced from cellulose. Developed in an attempt to produce silk chemically, it was originally called artificial silk or wood silk. Rayon is regenerated fiber, because cellulose is converted to a liquid compound and then back to cellulose in the form of fiber. For example, cuprammonium rayon is made by dissolving cellulose in an ammoniacal copper sulphate solution. Characteristics Of Rayon Fibers: They are highly absorbent,  Soft and comfortable  Easy to dye &  Drape well . 10

INTRODUCTION :- Cellulose is nature's own giant molecule. It is the fibrous materials that every plant from sea weed to the sequoia made by baking glucose molecules in long chains, the chains are bound together in the fibers that gives plants their shape and strength. Wood has now become the main source of cellulose. Since it contains only 40% to 50% cellulose, the substance must be extracted by "pulping". The logs are flaked, and then simmered in chemicals that dissolve the tarry lignin, resins and minerals. The remaining pulp, about 93% cellulose, is dried and rolled into sheets-raw material for paper, rayon and other products . 10

It can be obtained in two ways: 1. VISCOSE PROCESS :- Cellulose is soaked in 30% caustic soda solution for about 3hrs. The alkali solution is removed and the product is treated with CS 2. This gives cellulose xanthate, which is dissolved in NaOH solution to give viscous solution. This is filtered and forced through a spinneret into a dilute H2S04 solution, both of which harden the gum like thread into rayon fibers. The process of viscose was discovered by C.F.Cross & E.J.Bevan in the year1891. 2. CUPRAMMONIUM RAYON :- Cuprammonium rayon is obtained by dissolving pieces of filter paper in a deep blue solution containing tetra-ammine cupric hydroxide [Cu(NH3)4](OH)2]. The latter is obtained from a solution of copper sulphate [CuSO4] to it. NH40H solution is added to precipitate cupric hydroxide which is then dissolved in excess of NH3. Reactions: I. [Cu(NH3)4](OH)2 + pieces of filter paper left for 1 0-15 days → (give a viscous solution called VISCOSE ) 10

PROCEDURE A. Preparation of schweitzer" s solution: a) Weigh 20g of CuS04.5H2O b) Transfer this to a beaker having 100ml distilled water and add 15ml of dilute H2S04 to prevent hydrolysis of CUS04. c) Stir it with glass rod till a clear solution is obtained. Add l1inl of liquor ammonia drop by drop with slow stirring. The precipitate of cupric hydroxide is separated out. d) Filter the solution containing cupric hydroxide through a funnel with filter paper e) Wash the precipitate of cupric hydroxide with water until the filtrate fails to give a positive test for sulphate ions with barium chloride solution. . f) Transfer the precipitate to a beaker that contains 50mlliquor ammonia or wash it down the funnel. The precipitate when dissolved in liquor ammonia gives a deep blue solution of tetra ammine cupric hydroxide. This is known as SCHWEITZER'S SOLUTION B. Preparation of cellulose material: a) After weighing 2g of filter paper divide it into very fine pieces and then transfer these pieces to the tetra ammine cupric hydroxide solution in the beaker. b) Seal the flask and keep for 10-15 days, during this period the filter paper is dissolved completely. 10

C.RAYON THREADS FORMATION :a) Take 50ml of distilled water in glass container. To this add 20ml of conc. H2S04.Cool the solution under tap water. In a big container pour some of the solution. b) Fill the syringe with cellulose solution prepared before. c) Place the big glass container containing H 2S04 solution produced before in ice (the reaction being spontaneous results in excess release of energy in the form of heat which makes the fiber weak and breaks them). d) Immerse the tip of the syringe in the solution and press gently. Notice the fibers getting formed in acid bath. Continue to move your hand and keep pressing the syringe to extrude more fibers into the bath. e) Leave the fibers in solution till they decolourise and become strong enough. f) Filter and wash with distilled water. CONCLUSION  Sample of Cuprammonium Rayon Threads was successfully prepared. PRECAUTIONS a) Addition of excess NH3 should be avoided 10

b) Before taking the viscose in the syringe make sure, it does not contain any particle of paper otherwise, it would clog the needle of syringe. c) Addition ofNH3 should be done in a fume cupboard and with extreme care. The fumes if inhaled may cause giddiness. d) Use a thick needle otherwise the fiber won't come out. BIBLIOGRAPHY DISCLAIMER :I HAVE ALSO MADE THIS PROJECT TAKING HELP FROM INTERNET I EXPREE MY REGARDS WHO ARE ACTUALLY BEHIND THIS PROJECT. I HAVE UPLOADED THIS ONLY SO THAT MORE PEOPLE CAN TAKE HELP FROM THIS UPLOAD THROUGH MY PROFILE 10


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