AISSCECHEMISTRY INVESTIGATO RY SUBMITTED BY: PROJECT ALOK KUMAR XII ‘A’ K.V. NO.1,Gandhinagar CHEMISTRY INVESTIGATORY PROJECT Teacher …………………………. .. Sector 30.Laboratory certificate This is to certify that ALOK KUMAR of class XII (Science) Roll No has success fully completed his investigatory project in chemistry prescribed by the Central Board of Secondary Education (CBSE) in chemistry laboratory of Kendriya Vidyalaya No 1. Gandhinagar External Subject duringExaminer the year 2012-13.……………………… CHEMISTRY INVESTIGATORY PROJECT 2 . LABORATORY CERTIFICATE CHEMISTRY INVESTIGATORY PROJECT 3 . Mr. Sector 30. Gandhinagar under the guidance of our chemistry teachers. AK JHA Mrs.ACKNOWLEDGEM ENT This project is prepared by ALOK KUMAR of class XII in Kendriya Vidyalaya No 1. ANITA NAIR CHEMISTRY INVESTIGATORY PROJECT 4 . AIM TO PREPARE Urea FORMALDEHYDE RESIN (BAKELITE) CHEMISTRY INVESTIGATORY PROJECT 5 . 4 and 6) allowing up to 3 units of formaldehyde to attach to the ring. as a group. The initial reaction is formation of a hydroxymethyl Urea: • HOC6H5 + CH2O → HOC6H4CH2OH CHEMISTRY INVESTIGATORY PROJECT 6 . are formed by a step-growth polymerization reaction that can be either acidor base-catalyzed. • Urea is reactive towards formaldehyde at the ortho and para sites (sites 2.PREFAC • Formation and structure E • Urea-formaldehyde resins. and tetra-and higher Urea oligomers.• The hydroxymethyl group is capable of reacting with either another free ortho or para site. BisUrea-F can further link generating tri. and the second forms an ether bridge: • HOC6H4CH2OH + HOC6H5 → (HOC6H4)2CH2 + H2O • The diUrea (HOC6H4)2CH2 is called bisUrea F. The first reaction gives a methylene bridge. or with another hydroxymethyl group. • 2 HOC6H4CH2OH → (HOC6H4CH2)2O + H 2O CHEMISTRY INVESTIGATORY PROJECT 7 . DIAGRAM CHEMISTRY INVESTIGATORY PROJECT 8 . Urea FORMALDEHYDE RESIN (BAKELITE) CHEMISTRY INVESTIGATORY PROJECT 9 . REQUIREMENTS • • • • • • • • Beaker Urea Conc. HCl Dropper Water Rod Filter paper Formaldehyd e CHEMISTRY INVESTIGATORY PROJECT 10 . THEORY • Urea resins are condensation polymerization products of Ureaic derivatives with aldehyde such as formaldehyde. • Most important member of this class is Bakelite. • Its prepared by condensing Urea with formaldehyde in the presence of acidic or basic catalyst. Urea formaldehyde resin. CHEMISTRY INVESTIGATORY PROJECT 11 . 5g of Urea into it. • Pink mass will be formed in the beaker. CHEMISTRY INVESTIGATORY PROJECT 12 . • Wash.5 ml of 40% formaldehyde in a beaker. dry and weigh the product formed. • Add few drops of HCl to it and place it on hot plate.PROCEDURE • Take 5 ml of glacial acetic acid and 2. • Cover the beaker with watch glass or filter paper. • Add 2. Urea formaldehyde (Bakelite) is yielded.e.RESULT • Pink mass i. CHEMISTRY INVESTIGATORY PROJECT 13 . PRECAUTIONS • The reaction is sometimes vigorous and it is better to be little away from the beaker while adding conc. HCl. hydrochloric acid should be added drop wise carefully. CHEMISTRY INVESTIGATORY PROJECT 14 . • Conc. • Urea should be stirred in the formaldehyde solution for at least 10 mints to make it a saturated solution. THE END CHEMISTRY INVESTIGATORY PROJECT 15 .