Wednesday, April 13 - 8:30 - 9:30 pm
|Towards an Understanding of How Complex Latex Particles Are Formed: What Do We Know and When Did We Know It?|
Donald C. Sundberg, Ph.D.
Director, Nanostructured Polymers Research Center University of New Hampshire
Today we have a great variety of synthetic latices composed of nano-particles that are homogeneous, structured, hollow, multi-lobed or hybridized with other materials. They have huge specific surface areas presenting opportunities for special surface chemistries, but challenges for colloidal stability. They are made with as many as 5 or more monomers resulting in polymer chains that may be linear, branched, grafted, and/or crosslinked. These chains are “born” in the water and “die” in the particles. Searching for the chemical and physical mechanisms that determine the final properties of the latex has involved the application of organic and physical chemistry, surface chemistry, reaction kinetics, thermodynamics, molecular diffusion and engineering. What we know about these mechanisms, what tools we used to assist us in learning about them, and when during the past 75 years we decided we understood some of these mechanisms, form the basis for this presentation.