Karen I. Winey Professor 300 LRSM 215.898.0593 winey@lrsm.upenn.edu

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, nanotube composites, block copolymers, and polymeric drug delivery systems. Processing, morphology, rheology, mechanical and thermal properties, and phase behavior. Expertise in electron microscopy and x-ray scattering of polymers.

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, block copolymers, nanotube-polymer composites and nano-scale drug delivery systems with a specialty in materials manipulation and morphological characterization. She has authored over 65 papers in peer-reviewed journals and currently has over $500,000 in annual research expenditures excluding equipment. Prof. Winey received a National Science Foundation Young Investigator Award in 1994 and in 2003 was elected as a Fellow of the American Physical Society. She has served the Division of Polymer Physics within the American Physical Society as the Program Chair in 2002 and is currently serving as a Member-at-Large. Prof. Winey is also on the editorial advisory boards of Macromolecules and Journal of Polymer Science: Polymer Physics Edition.

At Penn, Prof. Winey has proven to be a versatile teacher having taught both core and elective courses at the undergraduate and graduate levels. Presently, she is developing an overview course entitled "Introduction to Nanotechnology" for the School of Engineering and Applied Science. Winey has supervised 3 postdoctoral fellows, 5 Ph.D. degrees, 7 M.S. degrees and over 30 undergraduate researchers. She has served her department and the engineering school in various capacities.

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

Block Copolymers: Blends, Shear Alignment, Kink Bands

1. K. I. Winey*, E. L. Thomas, and L. J. Fetters, J. Chem. Physics 95, 9367-9375, 1991.
   " Ordered morphologies in binary blends of diblock copolymer and homopolymer and characterization of their intermaterial dividing surfaces."
2. K. I. Winey*, E. L. Thomas, and L. J. Fetters, Macromolecules 24, 6182-6188, 1991.
   " The swelling of lamellar diblock copolymer by homopolymer: The influences of homopolymer concentration and molecular weight."
3. K. I. Winey*, E. L. Thomas, and L. J. Fetters, Macromolecules 25, 2645-2650, 1992.
   " Isothermal morphology diagrams for binary blends of diblock copolymer and homopolymer."
4. K. I. Winey*, S. S. Patel, R. G. Larson, and H. Watanabe, Macromolecules 26, 2542-2549, 1993.
   " Interdependence of shear deformation and block copolymer morphology."
5. K. I. Winey*, S. S. Patel, R. G. Larson, and H. Watanabe, Macromolecules 26, 4373-4375, 1993.
   " Morphology of a lamellae diblock copolymer aligned perpendicular to the sample plane: Transmission electron microscopy and small angle x-ray scattering."
6. B. S. Pinheiro, D. A. Hajduk, S. M. Gruner, and K. I. Winey*, Macromolecules 29, 1482-1489, 1996.
   " Shear stabilized bi-axial texture and lamellar contraction in both diblock copolymer and diblock copolymer / homopolymer blends."
7. D. L. Polis and K. I. Winey*, Macromolecules 29, 8180-8187, 1996.
   " Kink bands in a lamellar diblock copolymer induced by large amplitude oscillatory shear."
8. D. L. Polis and K. I. Winey*, Macromolecules, 31, 3617-3625, 1998.
   " Controlling kink band morphology in block copolymers: Threshold criteria and stability."
9. B. S. Pinheiro and K. I. Winey*, Macromolecules, 31, 4447-4456, 1998.
   " Mixed parallel-perpendicular morphologies in diblock copolymer systems correlated to the linear viscoelastic properties of the parallel and perpendicular morphologies."
10. D. L. Polis, S. D. Smith, N. J. Terrill, A. J. Ryan, D. C. Morse and 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."
11. J. H. Laurer, B. S. Pinheiro, D. L. Polis, and K. I. Winey*, Macromolecules, 32, 4999-5003, 1999.
    " Persistence of surface-induced alignment in block copolymers upon large amplitude oscillatory shear processing."
12. D. L. Polis, A. J. Ryan, S. D. Smith, and K. I. Winey*, Physical Review Letters, 83, 2861-2864, 1999.
    " Nature of viscoelasticity in lamellar diblock copolymers: Contraction correlated to strain localization."
13. L. Qiao and K. I. Winey*, Macromolecules, 33, 851-856, 2000.
    " Evolution of kink bands and tilt boundaries in block copolymers at large shear strains."
14. L. Qiao, K. I. Winey* and D. C. Morse*, Macromolecules, 34, 7858-7867, 2001.
    " Dynamics of kink bands in layered liquids: Theory and in situ SAXS experiments on a block copolymer melt."
15. L. Qiao, A. J. Ryan and K. I. Winey*, Macromolecules, 35, 3596-3600, 2002.
    " A correlation between lamellar contraction and applied shear stress in diblock copolymer."
    

Ionomers

1. J. H. Laurer and K. I. Winey*, Macromolecules, 31, 9106-9108, 1998.
   " Direct imaging of ionic aggregates in Zn-neutralized poly(ethylene-co-methacrylic acid) copolymers."
2. K. I. Winey*, J. H. Laurer, and B. P. Kirkmeyer, Macromolecules, 33, 507-513, 2000.
   " Ionic aggregates in partially Zn-neutralized poly(ethylene-co-methacrylic acid) ionomers: Shape, size and size dispersity."
3. B. P. Kirkmeyer, R. A. Weiss, and K. I. Winey*, J. Polym. Sci.: Polym. Phys., 39, 477-483, 2001.
   " Spherical and vesicular ionic aggregates in Zn-neutralized sulfonated polystyrene ionomers."
4. B. P. Kirkmeyer, A. Taubert, J.-S. Kim and K. I. Winey*, Macromolecules, 35, 2648-2653, 2002.
   " Vesicular ionic aggregates in poly(styrene-co-methacrylic acid) ionomers neutralized with Cs."
5. R. W. Walters, K. E. Sohn, K. I. Winey* and R. J. Composto*, Journal of Polymer Science: Part B: Polymer Physics Edition, 40, 2833-2841, 2002.
   " Local acid environments in poly(ethylene-ran-methacrylic acid) ionomers."
6. A. Taubert, J. D. Wind, D. R. Paul, W. J. Koros* and K. I. Winey, Polymer, 44, 1881-1892, 2003.
   " Novel polyimide ionomers: CO2 plasticization, morphology, and ion distribution."
7. B. P. Kirkmeyer, R. Puetter, A. Yahil and K. I. Winey*, J. Polym. Sci.: Polym. Phys., 41, 319-326, 2003.
   " Deconvolution of scanning transmission electron microscopy images of ionomers."

Nanotube Composites

1. R. Haggenmueller, H. H. Gommans, A. G. Rinzler, J. E. Fischer, and K. I. Winey*, Chemical Physics Letters, 330, 219-225, 2000.
   " Aligned single-wall carbon nanotubes in composites by melt processing methods."
2. R. Haggenmueller, W. Zhou, J. E. Fischer and K. I. Winey*, J. Nanoscience and Nanotechnology, 3, 105-110, 2003. " Production and characterization of polymer nanocomposites with highly aligned single-walled carbon nanotubes."
3. 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."
4. W. Zhou, J. Vavro, C. Guthy, K. I. Winey, J. E. Fischer, L. M. Ericson, S. Ramesh, R. Saini, V. A. Davis, C. Kittrel, M. Pasquali, R. H. Hauge, R. E. Smalley, J. Appl. Physics, accepted. " Single wall carbon nanotube fibers extruded from super-acid suspensions: Preferred orientation, electrical and thermal transport."
5. W. Zhou, M. F. Islam, H. Wang, D. L. Ho, A. G. Yodh, K. I. Winey, J. E. Fischer*, Chem. Phys. Lett., accepted. " Single wall carbon nanotube fibers extruded from super-acid suspensions: Preferred orientation, electrical and thermal transport."

Blend Miscisbility: Random Copolymers, Ternary Systems

1. M. E. Galvin*, S. Heffner, and K. I. Winey* Macromolecules 27, 3520-3524, 1994.
   " Deuterium effects on blend miscibility of an alternating copolymer and a homopolymer."
2. K. I. Winey*, M. L. Berba and 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."
3. M. Sikka, N. N. Pellegrini, E. A. Schmidt and K. I. Winey*, Macromolecules 30, 445-455, 1997.
   " Modifying a polystyrene / poly(methyl methacrylate) interface with poly(styrene-co-methyl methacrylate) random copolymers."
4. N. N. Pellegrini, M. Sikka, S. K. Satija, and K. I. Winey*, Macromolecules 30, 6640-6644, 1997.
   " Segregation of a random copolymer from miscible blends."
5. N. N. Pellegrini, M. Sikka, S. K. Satija, and K. I. Winey*, Polymer, 41, 2701-2704, 2000.
   " Random copolymer / homopolymer interfacial widths as a function of copolymer composition."
6. N. N. Pellegrini and K. I. Winey*, Macromolecules, 33, 73-79, 2000.
   " Asymmetric miscibility in random copolymer / homopolymer blends: Monomeric size and polarity."
7. N. N. Pellegrini, R. J. Composto*, and K. I. Winey*, Journal of Polymer Science: Polymer Physics Edition, 38, 1547-1552, 2000.
   " Investigating polymer blend miscibility with forward recoil spectrometry."

Drug Delivery: Extended Release, Nanoscale Systems

1. S. J. Siegel*, K. I. Winey, R. E. Gur, R. H. Lennox, D. Ikeda, N. Gandhi, W.-X. Zhang, Neuropsychopharmacology, 26, 817-823, 2002.
   " Surgically implantable long-term antipsychotic delivery systems for the treatment of schizophrenia."

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