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The “Did You Know….?” series is a bi-monthly note from Emulsion Polymers Consulting and Education (EPCEd) that is intended to present simple questions about topics that are important to those working in the emulsion polymers area. Short and concise answers to those questions are presented to educate readers and to elicit comments and further discussion. Some readers will already know the answers and be familiar with the topic while others, especially those newer to the field, will benefit from the answers and discussion. Experienced practitioners may also find new insights in the discussion. Paint & Coatings Industry magazine has partnered with EPCEd to share the “Did You Know” notes with our readers throughout the year.
Although often not appreciated, it is important to recognize is that how you conduct your process has a profound impact on where the acid groups reside and therefore on your final product properties.
The average molecular weight of a latex can be influenced by a number of factors, but it is often not realized that the number of particles in the latex (which is directly related to particle size) is important in determining molecular weight.
Whatever your reasons for varying the monomer feed rates, be aware that there may be unintended effects; in addition to the desired outcome, some product properties may also change.
We have been working on morphology control in latex particles for many years and have come to learn that achieving desired structures in composite particles is dependent not only upon the emulsion polymerization recipe, but also strongly upon the reaction process conditions.