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Polycarbonates are a class of thermoplastic polymers that are used in the plastic lenses of eyeglasses and in the shells of bicycle helmets. A polycarbonate is made from the reaction of bisphenol A (BPA) with phosgene (COCl 2 ): Phenol (C 6 H 5 OH) is used to terminate the polymer (stop its growth). a. Draw the structure of the polycarbonate chain formed from the above reaction. b. Is this reaction a condensation or an addition polymerization?

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Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

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Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 21, Problem 152CP
Textbook Problem
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Polycarbonates are a class of thermoplastic polymers that are used in the plastic lenses of eyeglasses and in the shells of bicycle helmets. A polycarbonate is made from the reaction of bisphenol A (BPA) with phosgene (COCl2):

Chapter 21, Problem 152CP, Polycarbonates are a class of thermoplastic polymers that are used in the plastic lenses of

Phenol (C6H5OH) is used to terminate the polymer (stop its growth).

a. Draw the structure of the polycarbonate chain formed from the above reaction.

b. Is this reaction a condensation or an addition polymerization?

 (a)

Interpretation Introduction

Interpretation: The structure of the polycarbonate chain formed by the given reaction is to be drawn and whether it is formed by addition or condensation polymerization is to be stated.

Concept introduction: The polymers (repeating structural units) are derived from the simple and reactive molecules, called as monomers. Depending upon the mode of polymerization, polymerization mainly occurs by addition and condensation polymerization reactions. Copolymers are formed when two or more different monomers condensed together in a polymerization reaction.

To determine: The structure of polycarbonate formed by the reaction between bisphenol A and phosgene.

Explanation of Solution

Explanation

The structure of polycarbonate is shown in Figure 1

The polymerization reaction between bisphenol A and phosgene (COCl2) is represented as,

Figure 1

The given monomers are bisphenol A and phosgene (carbonyl chloride)

(b)

Interpretation Introduction

Interpretation: The structure of the polycarbonate chain formed by the given reaction is to be drawn and whether it is formed by addition or condensation polymerization is to be stated.

Concept introduction: The polymers (repeating structural units) are derived from the simple and reactive molecules, called as monomers. Depending upon the mode of polymerization, polymerization mainly occurs by addition and condensation polymerization reactions. Copolymers are formed when two or more different monomers condensed together in a polymerization reaction.

To determine: The mode of polymerization for the formation of polycarbonates.

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Chapter 21 Solutions

Chemistry: An Atoms First Approach
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