Polymer_Problems___Solutions - Chem 358 Spring 2007...

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Chem 358 Spring 2007 Selected Practice Polymer Problems - Representative Solutions Questions 1(a), (b), 4, 5, and 6 are all examples of AA + BB polymerization. When AA reacts with BB it forms a product with A and B end groups. Each A end group can react with any species carrying a B group and vice versa. 1) AA + BB ——> A—ab—B 2) A—ab—B + A—ab—B ——> A—ab—ba—ab—B 3) BB + A—ab—B ——> B—ba—ab—B 4) A—ab—B + AA ——> A—ab—ba—A All these processes will occur simultaneously in any combination. Note that each product with A and B end groups can bend backwards and form cyclic structures. This is a serious side reaction for this type of polymerization. To prevent cyclization, which will kill the chain growth, high concentrations are used since intermolecular reactions are favored by high concentrations. HOCH 2 CH 2 CH 2 OH O O O O OCH 2 CH 2 CH 2 O O HOCH 2 CH 2 CH 2 O O O OCH 2 CH 2 CH 2 O O O OH O O HOCH 2 CH 2 CH 2 O OH O O HOCH 2 CH
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This note was uploaded on 04/22/2009 for the course CHEM 3570 taught by Professor Ganem, b during the Fall '06 term at Cornell University (Engineering School).

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Polymer_Problems___Solutions - Chem 358 Spring 2007...

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