Overview

In this Lesson, we will take a close look at step polymerization. If we know the number of reactive groups in our monomer mixture, and we can control how many groups react, then can we predict the number average degree of polymerization? We can! First we consider if we have stoichiometric balance of reactive groups, then we consider if we have a non-stoichiometric balance and what effects that has on the polymer produced. Finally, we end with a statistical analysis of step polymerization, which gives us insight into the distributions of the molar masses produced.

Learning Outcomes

By the end of this lesson, you should be able to:

• Define extent of reaction and reactant ratio
• Apply Carothers theory to step polymerization reactions
• Calculate the probability of finding a polymer of specific degree of polymerization, and the weight fraction or number fraction of polymers of a specific degree of polymerization

Lesson Checklist

Please refer to the Canvas Calendar for specific time frames.

Questions?

If you have questions, please feel free to post them to the General Questions and Discussion forum. While you are there, feel free to post your own responses if you, too, are able to help a classmate.