This research program addresses the investigation of conjugated polymer networks, a little-explored class of materials with interesting optic and electronic.

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Presentation transcript:

This research program addresses the investigation of conjugated polymer networks, a little-explored class of materials with interesting optic and electronic properties. For example, some of the semi- conducting materials developed under this grant exhibit superior charge transport characteristics. The network structure, however, renders these polymers intractable and therefore their synthesis and processing is intricate. Recent work by graduate student Akshay Kokil and undergraduate student Peter Yao demonstrated that conjugated polymers such as poly(p- phenylene ethynylene)s (PPEs) with 2,2’- bipyridine (Bipy) moieties in their backbone represent versatile precursors for conjugated metallo-supramolecular networks. These materials are readily accessible via ligand- exchange reactions between the Bipy- containing polymers and transition metals such as Zn 2+, Cd 2+, Cu +, Co 2+ and Ni 2+. Metallo-supramolecular networks are formed by ligand- exchange between 2,2’-bipypridine-containing poly(p- phenylene ethynylene)s and transition metal complexes. Conjugated Polymer Networks Christoph Weder, Case Western Reserve University DMR Absorption spectra acquired upon addition of [CuI(CH 3 CN) 4 ]PF 6 to asolution of Bipy- containing PPE. The inset shows the absorption at 452 nm as a function of [Cu + ]:[Bipy] ratio. Kokil, A.; Yao, P.; Weder, C. Macromolecules 2005, 38, 3800.

Conjugated Polymer Networks Christoph Weder, Case Western Reserve University DMR Education: This grant provides/provided partial support for 3 graduate students (Mr. A. Kokil, Ph.D.; Ms. C. Rademaker, M.S.; Mr. J. Mendez, Ph.D.) and 5 undergraduate students (Ms. S. Given, Mr. P. Yao, Mr. D. Wilger, Mr. E. Yamaguchi). Outreach: The grant supports two outreach programs which the PI developed in collaboration with Cleveland’s Museum of Natural History and Case colleague Stuart Rowan. Each year the Case team hosts the “Future Scientists Program” (a class of prospective scientists age ) for a hands-on day of polymer activities. The team is also part of the Museum’s “Winter Discovery Day”, an annual 1-day event in honor of Dr. Martin Graduate student Brent Crenshaw explains the similarity of building blocks and Gummi Bears. Luther King Jr. In the last two years, over 1400 guests of all backgrounds and ages visited the polymer exhibits at the Museum, put together by the Case PIs and their students. The 20-min tours featured mini-lectures, displays, demos and hands-on activities that showcase the importance of polymers.

Undergraduate student Kara Smith explains the similarity of building blocks and Gummi Bears. Conjugated Polymer Networks Christoph Weder, Case Western Reserve University DMR Extra pictures from the winter discovery day Graduate student Ben Beck and postdoc Dan Knapton explain the concept of macromolecules.