Winokur, Michael J

''X-ray Scattering Studies of Crystalline Polyaniline and the Role of Water Hydration'', M.J. Winokur and B.R. Mattes, Macromolecules 31, 8183 (1998).
''X-ray Scattering Line-Shape Analysis of the Thermotropic Liquid Crystal Transition in Poly(3-dodecylthiophene)'', T.J. Prosa, J. Moulton, A.J. Heeger and M.J. Winokur Macromolecules 32, 4000 (1999).
''The Generalized Anisotropic Planar Rotor Model and its Application to Polymer Intercalation Compounds'', G. Mao, D. Chen, F.E. Karasz and M.J. Winokur, Phys. Rev. Lett., 83, 2588 (1999) .
''X-ray Scattering Line-Shape Analysis of the Thermotropic Liquid Crystal Transition in Poly(3-dodecylthiophene)'', T.J. Prosa, J. Moulton, A.J. Heeger and M.J. Winokur Macromolecules 32, 4000 (1999).
''Effect of Processing Conditions on the Properties of High Molecular Weight Conductive Polyaniline Fiber'', H.L. Wang, R. Romero, Y.T. Zhu, M.J. Winokur and B.R. Mattes J. Polymer Sci, Polym. Phys.,38, 194 (2000)
'Polymorphism, Structure and Chromism in Poly(di-n-octylsilane) and Poly(di-n-decylsilane)'', W. Chunwachirasiri, R. West and M.J. Winokur, Macromolecules 33, 4000 (2000).
''Structure and Chain Conformation in Poly(methyl-n-alkyl)silanes'', W. Chunwachirasiri, I. Kanaglekar,J.C. Koe,R. West and M.J. Winokur, Macromolecules 34, 6719, (2001).
''X-ray diffraction and molecular modeling studies of poly(di--alkylsilanes): The near planar type phases of poly(di--butylsilane) and poly(di--hexylsilane)'', W. Chunwachirasiri, R. West and M.J. Winokur, Macromolecules 36, 7338 (2003).
''Structure, Photophysics and the Order-Disorder Transition to the Beta Phase in Poly(9,9-(di-n,n-octyl)fluorene)'', M.J. Winokur, J. Slinker and D.L. Huber, Phys. Rev. B,67 4106 (2003).
''Nanoscale Structure/Property Relations in Conjugated Polymers: Implications for Current and Future Device Applications'', M.J. Winokur and W. Chunwachirasiri, J. Polym. Sci., 41, 2630 (2003), invited review article.
''Molecular modeling and X-ray diffraction of poly(di-n-butylsilane): Evidence for a complex s(2-7/6) helix'', M.J. Winokur, W. Chunwachirasiri, J. Michl, D. Rooklin and R. West, in revision.
''Near-term aging and thermal behavior of polyfluorenes in various aggregation states,'' H. Cheun, B. Tanto, W. Chunwachirasiri, B. Larson and M.J. Winokur, Appl. Phys. Lett. 84, 22 (2004).
''Temperature-dependent behavior of tris(2,2-bipyridine)ruthenium (II) thin films and devices'', J.D. Slinker, G.G. Malliaras, S. Flores-Torres, H.D. Abruna, W. Chunwachirasiri and M.J. Winokur, J. Ap. Phys. 95, 4381 (2004).
''Structure, phase behavior and optical properties of poly(di-2-ethyl-n-hexylfluorene), B. Tanto, M. Chandrasekhar, S. Guha, C.M. Martin, U. Scherf and M.J. Winokur Macromolecules 37, 9438 (2004).
''Chain Conformations and Photophysics in Poly(di-n-octylfluorene),'' W. Chunwachirasiri, B. Tanto, D.L. Huber and M.J. Winokur, Phys. Rev. Lett. 94, 107402 (2005).
''Electroluminescence and photoluminescence in poly(di-n-octylfluorene) light-emitting diodes operated at elevated temperatures," H. Cheun and M.J. Winokur, Synth. Met. in press.
''Phase transition and electronic properties of Fluorene: A joint experimental and theoretical high pressure study", G. Heimel, K. Hummer, C. Ambrosch-Draxl, W. Chunwachirasiri and M.J. Winokur, M. Han, M. Oehzelt, A. Aichholzer and R. Resel, submitted to Phys. Rev. B.

Summary

The primary focus of our current research is the study of structure and structural evolution within conducting polymer hosts in their pristine state, during processing and after intercalation by secondary guest species. This structural information is an essential component for developing a comprehensive understanding of conducting polymer transport. Moreover, these systems exhibit unusual structural properties that arise from the competing interactions at molecular length scales. Much of our recent work has employed traditional Rietveld refinement methods (suitable for crystalline hosts) that have been optimized for polymeric materials. These core studies are now being supplemented by a number of newer structural analyses aimed at resolving key aspects of the local molecular ordering in semi-crystalline and amorphous systems.

Copyright 2009 The Board of Regents of the University of Wisconsin System
Date last modified: 31-Aug-2009
Content by: mwinokur@wisc.edu
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