Poly(ethylene terephthalate) is a linear polyester that can be synthesized from the condensation polymerization between terephthalic acid and ethylene glycol. The alcohol we would react with terephthalic acid to produce a branched polyester is to be found. A portion of the resulting polymer that shows a main chain and one branching point is to be drawn. Concept introduction: Step-growth polymerizations are referred to as condensation polymerization, because a small molecule (in this case, water) is formed as a product. Step-growth polymerization occurs when molecules throughout a mixture join with any other molecule that has an appropriate functional group available to react, whether it is a monomer unit or another polymer molecule. Many nucleophilic addition–elimination reactions can be used to make step-growth polymers . The condensation polymerization between terephthalic acid and ethylene glycol is also called as the Fischer esterification: The linear alcohol, ethylene glycol, forms a linear polymer . Therefore, in order to form a branched polymer, a branched alcohol is required. Branching can occur during polymerization when a monomer has multiple reactive sites. Such a branched alcohol is ethane-1, 1, 2-triol which can be used here to produce branched polyester.

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Chapter 26, Problem 26.52P

Interpretation Introduction

Interpretation:

Poly(ethylene terephthalate) is a linear polyester that can be synthesized from the condensation polymerization between terephthalic acid and ethylene glycol. The alcohol we would react with terephthalic acid to produce a branched polyester is to be found. A portion of the resulting polymer that shows a main chain and one branching point is to be drawn.

Concept introduction:

Step-growth polymerizations are referred to as condensation polymerization, because a small molecule (in this case, water) is formed as a product. Step-growth polymerization occurs when molecules throughout a mixture join with any other molecule that has an appropriate functional group available to react, whether it is a monomer unit or another polymer molecule. Many nucleophilic addition–elimination reactions can be used to make step-growth polymers. The condensation polymerization between terephthalic acid and ethylene glycol is also called as the Fischer esterification:

The linear alcohol, ethylene glycol, forms a linear polymer. Therefore, in order to form a branched polymer, a branched alcohol is required. Branching can occur during polymerization when a monomer has multiple reactive sites. Such a branched alcohol is ethane-1, 1, 2-triol which can be used here to produce branched polyester.

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Just try completing it and it should be straightforward according to the professor and TAs.

The grading is not on correctness, so if you can just get to the correct answers without perfectionism that would be great. They care about the steps and reasoning and that you did something. I asked for an extension, but was denied the extension.