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SUMMARY:Two Dimensional Polymers and Polymerizations
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20251107T160000
UID:2026-04-22-00-52-42@natsci.colostate.edu
DTSTAMP:20260422T005242
Description:About the seminar:\n\nSynthetic chemists have developed robust 
 methods to synthesize discrete molecules\, linear and branched polymers\, 
 and disordered cross-linked networks. However\, two-dimensional  (2D) pol
 ymers prepared from designed monomers have been long missing from these ca
 pabilities\, both as objects of chemical synthesis and in nature. Recently
 \, new polymerization strategies and characterization methods have enabled
  the unambiguous realization of 2D\, covalently linked macromolecular shee
 ts. In the early realization of this synthetic challenge\, polymerization 
 conditions were identified empirically by screening polymerization conditi
 ons through powder x-ray diffraction analysis of the insoluble powder prod
 ucts\, which provided polycrystalline samples with crystalline domains wit
 h average in-plane dimensions of 25-50 nm. More recently\, we have develop
 ed tools to study these polymerizations experimentally and computationally
 \, which has given rise to the first controlled two-dimensional polymeriza
 tions\, along with materials of improved quality. I will present these app
 roaches and the properties of high-quality 2D polymers that are now starti
 ng to emerge.\n\nAbout the speaker:\n\nWilliam Dichtel received a B.S. deg
 ree in Chemistry from MIT\, where he performed research with Prof. Tim Swa
 ger. Dichtel obtained his Ph.D. degree from UC-Berkeley under Prof. Jean M
 . J. Fréchet. He was a joint postdoctoral researcher with Prof. Fraser St
 oddart\, UCLA\, and Prof. James Heath\, Caltech. He began his independent 
 academic career at Cornell University in 2008 and was promoted to Associat
 e Professor in 2014. In 2016\, he moved to Northwestern University as the 
 Robert L. Letsinger Professor of Chemistry. The unifying theme of Dichtelâ
 €™s research is the use of organic synthesis and noncovalent assembly to c
 ontrol the structure and reactivity of molecules\, materials\, and interfa
 ces across chemical environments. His research has expanded the study of p
 olymerization processes into the second and third dimensions in an emergin
 g class of polymers known as covalent organic frameworks (COFs)\, porous p
 olymers for water purification\, and new approaches to polymer recycling. 
 Dichtel’s research has been recognized nationally and internationally. D
 ichtel has received a MacArthur Fellowship\, a Guggenheim Fellowship\, the
  Leo Hendrik Baekeland Award of the North Jersey Section of the ACS\, and 
 was named the 2020 National Laureate in Chemistry by the Blavatnik Awards 
 for Young Scientists. 4:00 pm
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