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Mechanical properties in the frequency and time domains show reinforcement

Polymer Nanocomposite Rheology: Research Ralph H. Colby, Pennsylvania State Univ University Park, DMR1006659.

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Mechanical properties in the frequency and time domains show reinforcement

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  1. Polymer Nanocomposite Rheology: ResearchRalph H. Colby, Pennsylvania State Univ University Park, DMR1006659 We study the critical role of nanoparticle (NP) size on the property improvements in polymer nanocomposites. If an optimum NP size exists, then, e.g., automobile tires with lower mass can be designed, thereby optimizing vehicle performance. The reinforcement in a polymer composite with 50nm silica NPs (right) show that reinforcement increases with NP loading. We are currently working on varying NP size as a means of locating an optimal NP size, if it exists. Mechanical properties in the frequency and time domains show reinforcement Dielectric measures of segmental relaxation reveal a less than 10 nm immobilized layerof polymer surrounding each nanoparticle

  2. “We want to know every factor that influences the thickness of the immobilized polymer bound layer which forms around silica nanoparticles in a polymer nanocomposite. We're examining a number of variables from polymer molecular weight to sample preparation methods, and of course, particle size. When do the particles become too small to effectively reinforce the polymer? The answer is currently being researched.” -Stacy “Previously, polymers have been chemically grafted on to nanoparticles, which enhanced the mechanical properties of such materials. My goal is to physically absorb polymers on to nanoparticles in hopes that they form superstructures such as strings and sheets.” -Adiba Polymer Nanocomposite Rheology: Outreach Ralph H. Colby, Pennsylvania State Univ University Park, DMR1006659 There are two undergraduates and one high school student participating in our research, all of whom come from very diverse backgrounds. Stacy Ramcharan, one of our undergrads, is a recipient of the McNair Fellows program for low income and underrepresented groups to prepare for a course of graduate study. Adiba Ahmad, also an undergraduate, joins our lab for the summer from NYU Polytechnic. Excerpts from discussions with Stacy and Abida are at the right. Edward Hu, is currently a NYC high school student working with us on a volunteer basis. His project is geared toward participation in a National Science Competition. All three are making amazing progress!

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