Lec-39-Chap-12-2 - Lecture 39 Synthetic Organic Polymers...

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Lecture 39 Synthetic Organic Polymers Chapter 12: pages 576-591 p.577 Polymer • large molecule formed by joining many smaller molecules together Monomer • small molecules which are joined together to form a polymer Reactions that form polymers are of two principal types: ADDITION: Polymer is made by adding monomer to monomer without formation of another product . CONDENSATION: Monomers react so as to eliminate small stable molecules (often, the elements of a water molecule) n A- H + n B- OH (AB) n + n H 2 O n A A n or n A + m B A n B m
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A Condensation Reaction - Ester Formation Acid (Acetic) Alcohol (Ethyl) Ester (Ethyl Acetate) Water C O O Ester Linkage CH 3 C O O H H O C 2 H 5 CH 3 C O O C 2 H 5 H O H + + [H + ] A Condensation Reaction - Amide Formation Benzoyl Chloride Methyl Amine Methyl Benzamide Amide Linkage Hydrochloric Acid HC l + C O N CH 3 H C O N H N H H CH 3 O Cl C + Suppose we put second Product can react with further OH O C HO H C H O H H O C HO H C H OH H H Ethylene Glycol Terephthalic Acid Ethylene Terephthalate alcohol or acid OO HO OH + groups on our molecules in ester formation. alcohol and acid O O O O O O O O OH O HO Result will be a product molecule of alternating acid and alcohol units with ester linkages between them A POLYESTER Which we can write as: O O O O n P oly E thylene TE rephthalate ( PETE )
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A similar situation occurs with acid chlorides and amines The resultant molecule is a monomer which can continue to react to form a POLY POLY N CH 2 CH 2 N H H H H C C O Cl Cl O N CH 2 CH 2 N H H H C C O Cl O Oxalyl Chloride Ethylene Diamine + AMIDE AMIDE Recycling Plastics Addition Polymers CH = CH 2 | R polyethylene R H polypropylene R CH 3 polyvinylchloride R Cl polystyrene R benzene ring Addition Polymerization CC H H H R radical initiator: R'O OR' 2 RO H H H
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This note was uploaded on 09/04/2009 for the course CHE 81914-01 taught by Professor Prof.benjaminhsiao during the Spring '06 term at SUNY Stony Brook.

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Lec-39-Chap-12-2 - Lecture 39 Synthetic Organic Polymers...

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