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Ch.12 - Solids and Modern Material
Chapter 12, Problem 69

Teflon is an addition polymer formed from the monomer shown here. Draw the structure of the polymer.
Chemical structure of a dibromoethylene monomer for Teflon polymerization.

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1
Identify the monomer structure: The given monomer is dibromoethylene, with the structure Br2C=Br2C.
Understand the polymerization process: Teflon is formed through an addition polymerization process where the double bonds in the monomer break and form single bonds, linking the monomers together.
Draw the repeating unit: Replace the double bond between the carbon atoms with a single bond and connect the carbon atoms to form a chain. Each carbon will have two bromine atoms attached.
Connect the repeating units: Link multiple repeating units together by connecting the carbon atoms in a chain, ensuring that each carbon atom has two bromine atoms attached.
Represent the polymer structure: Use the repeating unit to show the polymer chain, indicating that the structure repeats indefinitely to form the polymer Teflon.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Addition Polymerization

Addition polymerization is a process where unsaturated monomers, such as alkenes, react to form a polymer. In this reaction, the double bonds of the monomers open up, allowing them to link together into long chains. This type of polymerization is crucial for creating materials like Teflon, which is derived from the monomer shown in the image.
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Monomer Structure

A monomer is a small, simple molecule that can join together to form a polymer. The structure of the monomer determines the properties of the resulting polymer. In the case of Teflon, the dibromoethylene monomer features carbon-carbon double bonds and bromine substituents, which influence the polymer's characteristics, such as its chemical resistance and non-stick properties.
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Polymer Structure Representation

The structure of a polymer can be represented by repeating units derived from its monomer. For Teflon, the polymer structure consists of a long chain of carbon atoms with fluorine atoms attached, resulting from the addition of multiple dibromoethylene units. Understanding how to draw and represent these structures is essential for visualizing the properties and behaviors of polymers.
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