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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.
Semibatch emulsion polymerizations are predominately run in “starve-fed” mode, but what does that really mean? In this edition of PCI’s Did You Know column, EPCEd discusses the reasons to run in starve-fed mode, and more.
This article discusses how to control and quantify the amount of mixed polymer content as it can directly relate to the final morphology of the latex particles during polymerization.
The surfactants we add to synthetic latexes have allowed us to create wonderful nanoparticles and at the same time provide colloidal stability to the dispersions. But they also can cause foaming problems when mixing and transporting the latexes, and remain in the final products, causing potential water absorption problems in films and coatings.
This article discusses relating the colloidal stability of latexes to the ionic strength of the aqueous phase via the “critical coagulation concentration.
Salt ions affect the thickness of the "double layer" around the particles. As the double layer shrinks, the latex particles can move around more easily, and the result is a lower viscosity latex.
Did you know that differential scanning calorimetry (DSC) can be an important, even critical, analytical tool for determining the morphology of composite latex particles?
There are important advantages related to the latex properties that can be achieved with a semi-batch process, and more specifically a starve-fed process, which is simply a semi-batch process where the monomer concentration inside the polymer particles is kept very low by keeping the monomer feed rate to the reactor low.
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.