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Karen I. Winey
www.seas.upenn.edu/~winey/ |
B.S., Materials Science and Engineering, Cornell University, 1985.
M.S., Polymer Science and Engineering, University of Massachusetts, 1989.
Ph.D., Polymer Science and Engineering, University of Massachusetts, 1991.
Research Interests
Structure-property relationships in polymers. Ion-containing polymers, ionomers, polymer nanocomposites including carbon nanotubes, and block copolymers. Expertise in polymer morphology using electron microscopy and x-ray scattering. Ion transport, polymer dynamics, electrical properties, mechanical and rheological properties, and thermal conductivity.
Summary
Prof. Winey is currently an Professor of both Materials Science and Engineering and Chemical and Biomolecular Engineering at the University of Pennsylvania. Since joining Penn in 1992 she has developed research expertise in polymeric materials that includes ion-containing polymers, nanotube-polymer composites, and block copolymers with a specialty in materials manipulation and morphological characterization. Prof. Winey received a National Science Foundation Young Investigator Award (1994), was elected a Fellow of the American Physical Society (2003), and received a NSF Special Creativity Award (2009-2011).
Prof. Winey's research has been continuously supported by NSF-DMR since 1993. Current work is also funded by the Army Research Office, the Department of Energy, and the NSF-MRSEC program. In addition to numerous single investigator research grants, she has participated in various equipment grants, most recently as the PI to bring an environmental SEM with various in situ capabilities to the Penn Regional Nanotechnology Facility (installed 2008).
At Penn, Prof. Winey has proven to be a versatile teacher having taught both core and elective courses at the undergraduate and graduate levels. She has served her department and the engineering school in various capacities including on the Engineering Personnel Committed and as the chair of the Engineering Faculty Council.
Research Overview
The interplay of polymer morphology at various length scales and a wide variety of properties is central to Winey's research efforts. Her group has employed, for example, ionic interactions, blending, shear deformation, or solution processing to alter the morphologies in a variety of polymeric materials followed by characterization of rheological, mechanical, electrical, thermal and degradation properties.
While studying the alignment of lamellar block copolymers by shear, Winey's group identified the presence of kink band defects. The origin, growth and relaxation of these defects have been ascertained using a combination of electron microscopy and x-ray scattering methods. Our kink band studies motivated a kinematic model that describes the dynamics of kink bands that is consistent with our subsequent in situ scattering experiments.
Winey's group has directly imaged the ionic aggregates in various ionomers using a scanning transmission electron microscopy method. In addition to the expected nanoscale spherical aggregates, they have identified vesicular aggregates and macrophase separation. Recent studies have demonstrated the effects of cation and processing on the state of ionic aggregation. Winey's analytical microscopy and x-ray scattering methods are setting a new standard of rigor in the study of ionomer morphology.
Single-walled carbon nanotubes (SWNTs) are a new form of carbon with extraordinary properties. Winey's group is developing processing and characterization methods for SWNT/polymer composites. Thus far they have demonstrated the ability to disperse and align the SWNT in a polymer matrix and to quantify the extent of alignment using x-ray scattering. Electrical and thermal properties are of particular interest.
Finally, Winey's group has contributed to new methods of extended drug delivery. In conjunction with a faculty member in the School of Medicine, both implantable and oral delivery systems are under development to provide year-long and week-long, respectively, controlled release by designing and preparing biodegradable composite materials for the treatment of psychiatric diseases.
Selected Publications by Research Topic
Polymer Nanocomposites
R. Haggenmueller, H. H. Gommans, A. G. Rinzler, J. E. Fischer, K. I. Winey*, Chemical Physics Letters, 330, 219-225, 2000.
"Aligned single-wall carbon nanotubes in composites by melt processing methods."F. Du, J. E. Fischer, K. I. Winey*, J. Polym. Sci.: Polym. Phys., 41, 3333-3338, 2003.
"Coagulation method for preparing single-walled carbon nanotube/poly(methyl methacrylate) composites and their modulus, electrical conductivity, and thermal stability."F. Du, R. C. Scogna, W. Zhou, S. Brand, J. E. Fischer, K. I. Winey*, Macromolecules, 37, 9048-9055, 2004.
”Nanotube networks in polymer nanocomposites: Rheology and electrical conductivity.”T. Kashiwagi, F. Du, J. F. Douglas, K. I. Winey, R. H. Harris, Jr., J. R. Shields, Nature Materials, 4, 928-933, 2005.
”Nanoparticle networks reduce flammability polymer nanocomposites.”F. Du, J. E. Fischer, K. I. Winey*, Rapid Communication in Physical Review B, 72, 121404(R)-4, 2005.
”Effect of nanotube alignment on percolation conductivity in carbon nanotube / polymer composites.”M. Moniruzzaman, K. I. Winey*, Macromolecules, 39, 5194-5205, 2006.
"Polymer nanocomposites containing carbon nanotubes."
Designated a Hot Paper by Thomson ISI®'s Essential Science Indicators, 2007, 2008.R. Haggenmueller, J. E. Fischer, K. I. Winey*, Macromolecules, 39, 2964-2971, 2006.
”Single wall carbon nanotubes / polyethylene nanocomposites: Nucleating and templating polyethylene crystallites.”M. Moniruzzaman, J. Chattopadhyay, W. E. Billups, K. I. Winey*, Nano Letters, 7, 1178-1185, 2007.
"Tuning the mechanical properties of SWNT/nylon 6,10 composites with flexible spacers at the interface."Ion-Containing Polymers
J. H. Laurer, K. I. Winey*, Macromolecules, 31, 9106-9108, 1998.
"Direct imaging of ionic aggregates in Zn-neutralized poly(ethylene-co-methacrylic acid) copolymers."N. M. Benetatos, P. A. Heiney, K. I. Winey*, Macromolecules, 39, 5174-5176, 2006.
”Reconciling STEM and X-ray scattering data from a poly(styrene-ran-methacrylic acid) ionomer: Ionic aggregate size.”N. M. Benetatos, C. D. Chan, K. I. Winey*, Macromolecules, 40, 1081-1088, 2007.
”Quantitative morphology study of Cu-neutralized poly(styrene-ran-methacrylic acid) ionomers: STEM imaging, X-ray scattering, and real space structural modeling."T. W. Baughman, C. D. Chan, K. I. Winey*, K. B. Wagener*, Macromolecules, 40, 6564-6571, 2007.
"Synthesis and morphology of well-defined poly(ethylene-co-acrylic acid) copolymers."
Block Copolymers
K. I. Winey*, E. L. Thomas, L. J. Fetters, Macromolecules 24, 6182-6188, 1991.
"The swelling of lamellar diblock copolymer by homopolymer: The influences of homopolymer concentration and molecular weight."K. I. Winey*, E. L. Thomas, L. J. Fetters, Macromolecules 25, 2645-2650, 1992.
"Isothermal morphology diagrams for binary blends of diblock copolymer and homopolymer."D. L. Polis, K. I. Winey*, Macromolecules 29, 8180-8187, 1996.
"Kink bands in a lamellar diblock copolymer induced by large amplitude oscillatory shear."D. L. Polis, S. D. Smith, N. J. Terrill, A. J. Ryan, D. C. Morse, K. I. Winey*, Macromolecules, 32, 4668-4676, 1999.
"Shear-induced lamellar rotation observed in a diblock copolymer by in situ small angle x‑ray scattering."L. Qiao, K. I. Winey*, Macromolecules, 33, 851-856, 2000.
"Evolution of kink bands and tilt boundaries in block copolymers at large shear strains."Phase Behavior
K. I. Winey*, M. L. Berba M. E. Galvin, Macromolecules 29, 2868-2877, 1996.
"Ternary phase diagrams of poly(styrene-co-methyl methacrylate), poly(methyl methacrylate), and polystyrene: Monomer sequence distribution effect and encapsulation."N. C. Zhou, W. R. Burghardt, K. I. Winey*, Macromolecules, 40, 6401-6405, 2007.
"Blend miscibility of sulfonated polystyrene ionom
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