Rayon Fibre

Cuprammonium Rayon threads from Filter re determineation AAKASH NARAYAN XII-B DON BOSCO SCHOOL i. n. d. e. x 1. Objective 2. Certificate 3. Acknowledgement 4. Apparatus 5. Chemicals 6. Summary 7. Introduction 8. occasion 9. Precautions 10. Bibliography o. b. j. e. c. t. i. v. e To make Cuprammonium Rayon Threads From Filter Paper c. e. r. t. i. f. i. c. a. t. eThis is to certify that Aakash Narayan, student of Class XII B, simulate Bosco School ,Alaknanda has completed the project titled Cuprammonium Rayon Threads from Filter Paper during the academic year 2010-2011, towards incomplete fulfilment of credit for the chemistry practical evaluation of CBSE Board, and submitted satisfactory report, as compiled in the following pages, under(a) my supervision. This project is absolutely genuine and does not indulge in plagiarism of any kind.The references taken in making this project constitute been decl ared at the end of this report. Ms. Cecilia Manichan Don Bosco School, Alaknanda a . c. k. n. o. w. l. e. d. g. e. m. e. n. t There are times when silence speaks so much more loudly than wordsofpraise to only as good as belittle a person, whose words do not express, but only put a veneer over true feelings, which areofgratitude at this pointoftime.. I would comparable to express my sincere gratitude to my chemistry teacher Ms. Cecilia Manichan ,for her vital mount, guidance and encouragement without which this project would not have come-forth.I would also like to express my gratitude to the staff of the Department of Chemistry atDon Bosco School for their support during the making of this project. I would also like to thank my partner ,my friend Gaurab Das Gupta helping me to actualize the project. Aakash Narayan XII B, Don Bosco School a. p. p. a. r. a. t. u. s 1) Conical flask (250 ml) 2) Funnel 3) Glass rod 4) Beaker (250 ml) 5) water supply bath 6) Whatman Filter subject pic c. h. e. m. i. c. a. l. s 1) Copper Sulphate(CuSO4 ) 2) Caustic Soda issue(NAO H) 3) Liquor ammonia consequence ) Dilute sulfuric Acid (H2SO4) 5) Whatman Paper 6) Distilled water (H2O) s. u. m. m. a. r. y Rayon is a cellulose-based synthetic fiber . it was before called artificial silk or wood silk, be cook, it got Developed in an attempt to chemically produce silk. Rayon is a regenerated fiber. cellulose is born-again to a liquid compound and then back to cellulose in the form of fiber. cuprammonium rayon is obtained by looseness cellulose in ammoniacal copper sulphate beginning. The rayon fibers have special characteristics They are highly absorbent, ?Soft and comfortable, ? Easy to disgrace & ? Drape well. i. n. t. r. o. d. u. c. t. i. o. n Cellulose is natures own giant molecule. It is the fibrous material that every whole works makes by baking glucose molecules in long chains, from seaweed to the sequoia the chains are bound together in the fibers that form plants their shape and strength. Wood is the main source of cellulose. it contains 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-out and rolled into sheets-raw material for paper, rayon and other products. It can be obtained in two ways 1. Viscose cultivate Cellulose is soaked in 30% caustic soda result for about 3 hrs. The alkali solution is removed and the product is treated with carbon di-sulphide (CS2). This gives cellulose xanthate, which is fade out in caustic soda (NaOH) solution to give viscous solution. This is filtered and forced through a spinneret into a dilute sulphuric acid (H2SO4) solution, both of which change the gum-like thread into rayon fibers.The process of making cellulose xanthate was discovered by C. F. Cross and E. J. Bevan in 1891. 2. Cuprammonium Rayon Cuprammonium rayon is obtained by dissolving pieces of filter paper in a deep blue solution containing tetra-ammine cu pric hydrated oxide. The latter is obtained from a solution of copper sulphate (CuSO4). To it, ammonia solution (NH4OH) is added to precipitate cupric hydroxide (Cu(OH)2), which is then dissolved in excess of ammonia (NH3. ) Reactions CuSO4 + 2NH4OH Cu(OH)2 + (NH4)2SO4 (Pale Blue Precipitate)Cu(OH) 2 + 4NH4OH Cu(NH3) 4(OH) 2 + 4H2O Cu(NH3) 4(OH) 2 + pieces of filter paper go forth for 10-15 days give a viscous solution called VISCOSE. p. r. o. c. e. d. u. r. e I. Preparation of Schweitzers Solution 1) Weigh 20g of CuSO4. 5H20. pic 2) Transfer this to a beaker having 100ml distilled water and add 15ml of dilute H2SO4 to prevent hydrolysis of CuSO4. pic 3) Stir it with a nut case rod till a clear solution is obtained. Add 11ml of hard drink ammonia drop by drop with slow stirring. The precipitate of cupric hydroxide is separated out. pic ) Filter the solution containing cupric hydroxide through a funnel with filter paper. pic pic 5) Wash the precipitate of cupric hydroxide with water until the filtrate fails to give a positive test for sulphate ions with barium chloride solution. pic pic 6) Transfer the precipitate to a beaker that contains 50ml of liquor 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 SCHWEITZERS SOLUTION. pic II. Preparation of Cellulose material ) subsequently 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. pic pic 2) Seal the flask and corroborate for 10 to 15 days, during this period the filter paper is dissolved completely. iii. Formation of Rayon Thread 1) Take 50ml of distilled water in a nut container. To this add 20ml of conc. Sulphuric acid (H2SO4) drop by drop. Cool the solution under tap water. In a epic glass container pour some of the solution. 2) Fill the syringe with cellulose solution prepared before. pic ) Place the big glass container containing H2SO4 solution produced before in ice (the reaction being spontaneous results in excess change by reversal of energy in the form of heat which makes the fibers weak and breaks them). pic pic 4) Immerse the tip of the syringe in the solution and press gently. Notice the fibers getting formed in the acid bath. Continue to move your hand and keep pressing the syringe to extrude more fibers into the bath. 5) Leave the fibers in solution till they decolorize and generate strong enough. pic pic pic 6) Filter and wash with distilled water. . r. e. c. a. u. t. i. o. n. s 1) addendum of excess NH3 should be avoided. 2) Before taking the viscose in the syringe make sure that it does not contain any particles of paper, otherwise, it would clog the needle of the syringe. 3) Addition of NH3 should be done in a fume cupboard and with extreme care. The fumes if inhaled may cause giddiness. 4) Use a thick needle otherwise the fibers wont come out. b . i. b. l. i. o. g. r. a. p. h. y I. Google. com II. Ask. com III. Wikipedia. com IV. encyclopedicLaboratory Manual in chemistry XII picpic