Synthesis of Polymers_144

Synthesis of Polymers_144 - S ynthe of Polym rs sis e S B...

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Synthesis of Polymers SUSB -20
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Objectives : To examine chemical reactions by which some polymers are prepared To examine how the properties of the products prepared depend on reactants and reaction conditions
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R C O O H R O H R 1 C O O R 2 R 1 C O Cl R N H H R 1 C O N R 2 H Acid Alcohol Ester Acid Chloride Amine Amide Organic Functional Groups
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Reactions that form polymers are of two principal types: ADDITION (Chain Growth): Polymer is made by adding monomer to monomer without formation of another product . E.g., CONDENSATION (Step Growth): Monomers react so as to eliminate small stable molecules (often, the elements of a water molecule). E.g., n A- H + n B- OH (A-B) + n H 2 O n A A or n A + m B A B
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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 + ]
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Question: If we want to continue the reaction further - to increase the length of the polymer - what is required? a. Heat the reaction b. Change the monomer so it has more than one functional group c. Remove the product as it is formed d. Irradiate the reaction mixture with light e. It just won’t work
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Correct answer: B Lets consider the reaction of a molecule with two alcohol groups and another molecule with two carboxylic acid groups Ethylene glycol + terephthalic acid ethylene terephthalate + water HO CH 2 CH 2 O H C O C O HO OH C O C O OH HO CH 2 CH 2 H 2 O O
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The product terephthlate can react further to produce a POLYESTER Poly EthyleneTetraphthaltae PETE This allows the polymer to grow in a linear fashion – LINEAR POLYMER C O C O O CH 2 CH 2 CH 2 CH 2 O C O O C O O C O C O O CH 2 CH 2 O n
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Synthesis of Polymers_144 - S ynthe of Polym rs sis e S B...

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