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| polyacetylene | |
|---|---|
| Name | Polyacetylene |
| Formula | (C2H2)n |
| Molar mass | variable |
| Density | ~1.1 g/cm3 |
| Melting point | varies |
| Appearance | film, powder |
polyacetylene
Polyacetylene is a conjugated polymer consisting of repeating vinylene units; it bridges organic chemistry, materials science, and condensed matter physics and has been studied alongside Linus Pauling, Richard Feynman, John Bardeen, Walter Brattain, and William Shockley in the context of electronic materials. The polymer's discovery and subsequent study involved collaborations and debates among researchers at institutions such as University of Pennsylvania, Harvard University, Bell Laboratories, Cornell University, and Stanford University and intersected with industrial research at DuPont, Eastman Kodak Company, and IBM Research. Its importance grew through interaction with fields represented by Nobel Prize in Physics, Nobel Prize in Chemistry, Royal Society, American Chemical Society, and Max Planck Society.
Polyacetylene has a backbone of sp2-hybridized carbon atoms forming alternating single and double bonds; models and calculations were developed by theorists including Philip W. Anderson, Boris I. Halperin, Walter Kohn, P. W. Anderson (duplicate avoided), and influenced studies at Massachusetts Institute of Technology, Caltech, and Princeton University. Isomerism arises as cis and trans stereoisomers, with the trans form typically more stable and often found in crystalline films prepared under controlled conditions at laboratories such as ETH Zurich and University of Cambridge. Electronic structure descriptions invoked concepts from Peierls transition, Su–Schrieffer–Heeger model, and ideas advanced at Bell Labs and by researchers affiliated with MIT Lincoln Laboratory and Argonne National Laboratory.
Preparation of polyacetylene was historically achieved by catalytic polymerization of acetylene and by organometallic routes pioneered at University of Wisconsin–Madison, University of Chicago, and industrial labs including DuPont Central Research. Ziegler–Natta type catalysts, metallocene catalysts, and ring-opening metathesis polymerization methods were adapted from studies at ETH Lausanne and Tokyo Institute of Technology. Chemical vapor deposition, solution polymerization, and electrochemical polymerization protocols were refined in groups at Swiss Federal Institute of Technology, Ecole Polytechnique, and University of Tokyo, often referencing methodologies developed for related polymers at Imperial College London and University of California, Berkeley.
The dramatic increase in conductivity upon oxidation or reduction of polyacetylene was highlighted by work at University of Pennsylvania, Bell Laboratories, and Harvard University, linking it to concepts explored by John B. Goodenough, Alan J. Heeger, Alan G. MacDiarmid, and Hideki Shirakawa. Doping with electron acceptors such as iodine or electron donors such as alkali metals produces polaronic and solitonic charge carriers described using theories from Landau, Lev Landau, and Niels Bohr-level frameworks adapted by condensed matter groups at Brookhaven National Laboratory and Los Alamos National Laboratory. Experimental demonstrations referenced techniques from National Institute of Standards and Technology and measurement practices used at Rutherford Appleton Laboratory.
Characterization of polyacetylene utilized spectroscopy and diffraction techniques developed at facilities like European Synchrotron Radiation Facility, Diamond Light Source, Brookhaven National Laboratory, and Lawrence Berkeley National Laboratory. Infrared spectroscopy, Raman spectroscopy, nuclear magnetic resonance performed at University of Oxford, University of Cambridge, and Yale University elucidated bonding and defect structures; X-ray diffraction studies connected morphology to electronic behavior in collaborations including Argonne National Laboratory and SLAC National Accelerator Laboratory. Mechanical testing and thermal analysis drew from methodologies used at National Institutes of Health-affiliated labs and standards of International Union of Pure and Applied Chemistry.
Early envisioned applications of conductive polyacetylene spanned organic electronics, photovoltaics, and sensors explored at Bellcore, Mitsubishi Electric, and Hitachi, and influenced research into organic light-emitting diodes at Sony and Eastman Kodak Company. Integration into devices required interface engineering studied at Sandia National Laboratories, Fraunhofer Society, and Toyota Central R&D Labs; potential uses included antistatic coatings, electromagnetic shielding for NASA missions, and components for flexible electronics similar to efforts at Samsung Electronics and LG Electronics. Challenges in stability, processability, and reproducibility limited commercialization compared with derivatives researched at E. I. du Pont de Nemours and Company and institutions like Johns Hopkins University.
Polyacetylene's renaissance in the late 1970s brought recognition to researchers associated with University of Pennsylvania and University of Pennsylvania Department of Chemistry who worked with collaborators at Bell Laboratories and University of Pennsylvania School of Medicine; this body of work contributed to the awarding of the Nobel Prize in Chemistry to Alan J. Heeger, Alan G. MacDiarmid, and Hideki Shirakawa. The prize citation reflected advances that connected experimental findings to theoretical models developed by scholars at Princeton University, Cambridge University Press-hosted seminars, and institutes such as Kavli Institute for Theoretical Physics. The legacy influenced subsequent materials breakthroughs at MIT, Caltech, Stanford University, and multinational corporations including 3M, shaping the trajectory of organic electronics research.
Category:Polymers