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Ellison Lab Overview

Ellison Lab Overview. Current members Jeff Easley , PhD Candidate Josh Katzenstein , PhD Candidate Alfredo Clemente Cruz , Masters Candidate Bobby Sankhagowit , Undergraduate Amanda Beck , Undergraduate Looking to add 1 or more PhD student. Ellison Research Overview. mechanical

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Ellison Lab Overview

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  1. Ellison LabOverview • Current members • Jeff Easley, PhD Candidate • Josh Katzenstein, PhD Candidate • Alfredo Clemente Cruz, Masters Candidate • Bobby Sankhagowit, Undergraduate • Amanda Beck, Undergraduate • Looking to add 1 or more PhD student

  2. Ellison ResearchOverview mechanical electromagnetic conductive thermal barrier shear and extensional flows electric and magnetic fields anionic, RAFT, ATRP, NMRP, new functional monomers 1 Å – 100’s nm monomer macromolecular bulk Synthesis Structure Processing Properties Our research theme is connecting nanoscale / molecular level detail to macroscopic function for designing next generation materials.

  3. Li, et al. J. Membr. Sci. 2002 Hinsberg, et al. IBM J. Vac. Sci. Tech. B 1998 Nanostructured Polymers: Technological Impact • Asymmetric membranes for gas separation • Koros and Pasek (J. Membr. Sci. 1993) • Polysulfone (Udel) skin layers 20-80 nm thick • Photoresist, production of microelectronics • Okoroanyanwu (J. Vac. Sci. Tech. B 2000) • Understanding properties of polymer confined to feature sizes < 100 nm needed for future devices • Nanocomposites • Vaia and Giannelis (MRS Bulletin 2001) • Low loading levels (~several vol%), all polymer lies < 100 nm from composite interface

  4. Ellison Lab: “Active” Projects • New “Designer” Materials – molecular design via synthesis for tailored properties (responsive, conductive, mechanical, separations, etc) • Project 1: Directing Nanoscale Fillers for Recyclable Barrier Materials, Nanocomposite Solar Cells, etc. • Novel Characterization Tech. – attaining critical pieces of information others cannot using fluorescence approaches (focused on surfaces and interfaces and in-situ) • Project 2: Understanding the “Interphase” in Nanocomposites, • Polymer Self-Diffusion in Thin Films • “Green” Polymer Strategies– processing in the absence of volatile solvents, additives, etc., renewable materials • Project 3: “Green” Processing Route to Polymer Nanofibers, Designer Materials from Renewable Resources, etc.

  5. www.phi.com Disk Drive Lubricant Recovery Latex Film Formation http://www.chem.utoronto.ca/staff/MAW/ Nanocomposite Exfoliation Polymer Diffusion Near Surfaces / Interfaces • Why is it important?

  6. Fractional Recovered Fluorescence Intensity Photobleaching 2ri t = 0 t = t1 Recovery t = t2 Fluorescence Recovery After Photobleaching (FRAP) • Model geometry of thin and ultrathin films: In-plane diffusion • Demonstrated as viable approach, single MW and temp.1 • Start with simple system: anthracene labeled homopolymer characteristic diffusion time 1 Frank B., et al, Macromolecules 29, 1996.

  7. Melt Blowing: Green Polymer Nanofibers • Solventless, environmentally benign process • Method of choice for many nonwoven products – low cost, high prod. rates • Produces microfibers with diameter > 2 μm • Processing variables: • Polymer and air temperatures (Tp, Ta) • Polymer and air flow rates • Fiber formation: • Hot air jet draws fiber • Active T window: Tg or Tc < T < Tp Tg or Tc • Compared to electrospinning: • Higher production rate • No solvent

  8. PBT PP PS PBT PP Ellison, Phatak, Giles, Macosko, Bates Polymer 48, 2007.

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