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Chapter 12: Problem 25

What is a polymer? What is the difference between a polymer and a copolymer?

Short Answer

Expert verified
A polymer is a large molecule made of repeating units called monomers. A copolymer is a type of polymer derived from two or more different monomers, whereas a polymer can be a single type of monomer (homopolymer).

Step by step solution

01

Defining a Polymer

A polymer is a large molecule made up of repeating structural units called monomers, which are covalently bonded to form long chains. These chains can have various lengths and can branch or cross-link with other chains.
02

Understanding a Copolymer

A copolymer is a type of polymer that is derived from two (or more) different monomeric species. This contrasts with a homopolymer, where all the repeating units are identical.
03

Differentiating between Polymers and Copolymers

The main difference lies in the monomer composition. Polymers can refer to any chain of repeating units, which can be the same (homopolymers). Copolymers specifically contain more than one type of monomer, resulting in different kinds of structural units within the same chain.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Polymers
Polymers are fascinating substances that can be thought of as long necklaces, where the beads represent small repeating units called monomers. Linked together covalently, monomers form a diverse range of structures that make up natural and synthetic materials.

From the rubber in tires to the DNA in our cells, polymers are ubiquitous. They have an incredibly wide array of properties, determined by the nature of the monomers and the structure of the chains they form. This diversity is harnessed to create everything from flexible plastics to rigid and strong construction materials.
What is a Copolymer?
Imagine creating a necklace with more than one kind of bead; that's essentially what a copolymer is. It is a type of polymer where at least two different kinds of monomers are strung together in varying sequences.

These multicolored 'necklaces' inherit properties from the various monomers they include, allowing chemists to tailor materials for specific functions. Copolymers can have advantages over homopolymers, such as increased flexibility, strength, or resistance to chemicals depending on the monomers used.
The Basics of Monomers
Monomers are the building blocks of polymers. They are small molecules, often composed of carbon and other elements like hydrogen, oxygen, or nitrogen, that can join together to form larger structures.

These small units can be thought of as individual Lego bricks that, when connected, can create an incredible variety of shapes and sizes. Understanding the properties of monomers is crucial because they determine the characteristics of the polymers they form. For example, the vinyl chloride monomer is used to make PVC, a tough plastic, while ethylene monomers create polyethylene, a lighter and more flexible material.
Homopolymers in Detail
A homopolymer is the simplest form of a polymer - it's the result of stringing together identical monomers, like a row of identical beads. All the repeating units in a homopolymer are the same; think of polyethylene, which is solely composed of ethylene monomers.

Such structural uniformity in homopolymers leads to predictable and uniform properties, which can be useful in creating materials where consistency is key. However, this can also be a limitation compared to the versatility found in copolymers.

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Most popular questions from this chapter

Which solid would you expect to have the largest band gap? a. As(s) b. Sb(s) c. Bi(s)

One of the key components in the manufacture of Portland cement is Ca3SiO5, a compound that is obtained by firing the reactants in a kiln at 1400-1500 C. Assign an oxidation state to each element in this compound.

List the questions you would need to ask in order to classify a solid into one of the categories of crystalline solids (molecular solid, ionic solid, nonbonded solid, metallic solid, and network covalent solid). In what sequence is it best to ask them? (Hint: You may need a branching decision tree.) Once you have agreed on a good set of questions, have each group member choose a substance from the chapter, and have the other group members ask the questions from the list in turn until the correct classification is reached. Group members may agree to edit the list if they discover ways to improve it while using it.

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Consider the face-centered cubic structure shown here: a. What is the length of the line (labeled c) that runs diagonally across one of the faces of the cube in terms of r (the atomic radius)? b. Use the answer to part a and the Pythagorean theorem to derive the expression for the edge length (l) in terms of r.
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