Chemistry project 12th Essay

This reply is highly exothermic, but that is not why the plastic produced is referred to as thermosetting. Bakelite is a space-network polymer. Unlike linear and prongy polymers, which are composed of foresightful molecules that make them more or less crystalline, space-network polymers are highly and irregularly cross-linked throughout the structure. The sheer achievement of the cross-linking means that a sample of the material is essentially one gigantic molecule. Although heat softens and melts linear and branched polymers, heating doesnt soften space-network polymers because such a softening would require the breaking of covalent bonds. In fact, heating usually produces additional cross-linking in these polymers, making them harder. It is for this reason that space-network polymers, such as bakelite, are called thermoset plastics.PROCEDURE1. Take 5ml acetic acid and 2.5ml formaldehyde in a breaker. 2. Add 2mg of phenol to this reply and stir the mixture. 3. Wrap a cloth loos ely round the beaker.4. Stir the solution well plot heating.5. Pass dry hydrochloric acid gas or add a few ml of coaxial hydrochloric acid into the mixture.ObservationA large mass of light pink plastic is produce in spite of appearance 5 minutes.Precautionsa) The face of the beaker should not be towards the face of the worker during heating. b) Hydrochloric acid should not be poured into chemical reaction mixture very slowly. c) The contact of phenol with skin should be avoided.CautionAs the reaction is sometimes vigorous while adding hydrochloric acid .It is better to be a few feet away from the beaker till the reaction in complete.Scope of the experimentUses of Bakelite are followingSubstituteBakelite is employ as a diversify of porcelain & other opaque ceramic materials. Board/table topIt is used in the area of mount up & table top games e.g. Billiard balls ,Dominoes etc. MountingIt is used in mounting of metal samples.It is used in whistles, cameras, solid body& electric g uitars. Bakelite is very suitable for emerging Electric & automobile industries because as its extra ordinary resistance but in any case due to its thermal resistance. It has been widely used in jewellery products.References1. Wikipedia http//en.wikipedia.org/wiki/bakelite 2. www.scribd.com3. Comprehensive chemistry practical class XIIAcknowledgmentI owe a great many thanks to a great many people who helped and supported me during the protrusion. My deepest thanks to , the absorb of the project for guiding and correcting various documents of mine with attention and care. She has taken pain to go through the project and make necessary correction as and when needed. I express my thanks to the principal, for extending his support. My deep sense of gratitude to the in charge of chemistry lab at CSE for their support and guidance. Thanks and appreciation to the helpful people at for the support. I would also thank my school and my friends without whom this project would have been a di stant reality. I also extend my heartfelt thanks to my family and well wishers.