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Center for the Science and Technology of Advanced Materials and Interfaces

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Author: Baer, Eric ×

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Now showing 1 - 3 of 3
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    Interface and Interphase in Polymeric Multilayer Materials
    (Georgia Institute of Technology, 2016-11-09) Baer, Eric
    Lessons from biology have revealed that natural materials systems have hierarchical structures that are specifically designed to accommodate a unique spectrum of required properties. These systems always have many scale levels that are bound together by interfacial coupling or adhesion. Micro/nanolayered coextrusion processing is highly suited to apply these lessons of scale, interaction and architecture. Three examples will be discussed emphasizing scale in photonic applications with high refractive index contrast, interfacial phenomena in amorphous systems, and polymer solid state structure and morphology obtained by confined crystallization. With different amorphous polymers, the degree of segmental interdiffusion has been quantitatively correlated with the thickness of the interphase region. This enables the establishment of relationships between adhesion and various degrees of miscibility. Finally, unique single crystal with lamellar orientation during confined crystallization, will be discussed which allows the development of high barrier packaging systems.
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    Applications for New Nanolayered Composite and Membrane Filters
    (Georgia Institute of Technology, 2016-11-08) Baer, Eric
    The fundamental discoveries with polymer micro/nanolayered and fibrillar systems are being “translated” into new novel products. Three examples will be described in detail. First the development of graded index lenses, which are copies of mamalian lenses for application in telescopic systems, will be outlined. This will be followed by describing new capacitors with much higher storage and use temperature characteristics. Finally, new membrane filters will be described that are specifically designed for the removal of water droplets out of gasoline. The lecture series will be concluded by indicating additional applications currently under consideration.
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    Layered and Fibrillar Polymeric Systems by NanoExtrusion Forced Assembly
    (Georgia Institute of Technology, 2016-11-07) Baer, Eric
    Recently, numerous new synthetic approaches have been used to develop macromolecular materials that “self-assemble” into nano-scale morphologies. This lecture addresses another approach – the solventless “forced-assembly” of extrudable synthetic polymers down to the nano-scale. Numerous commercial films currently available, used primarily in food packaging, have only a few layers. These films have a desirable mix of end-use characteristics. Layer-multiplying devices permit polymers with dissimilar solid state structures and properties to be combined into unique microlayer and nanolayer systems with thousands of layers. Studies of these layered polymer composites down to the nano-scale have revealed unique properties which are only achievable when the layers are thin enough to produce synergistic combinations of key properties of the constituent components. Recently, a new highly flexible continuous process for creating unique nanofibers by a related solventless co-extrusion methodology will also be described with particular emphasis on membrane filters for gaseous and liquid separation systems.