Poly(hydridocarbyne)
| Poly(hydridocarbyne) | |
|---|---|
| Formula | [HC]n |
| Molecular mass | 200,000 to 100 million Daltons |
| Melting point | decomposes @ 100°C |
| Boiling point | N/A |
| Density | ??.?? g/cm³ |
| CAS number | ???-??-? |
| SMILES | ??????? |
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Poly(hydridocarbyne) (PHC) is one of a class of carbon-based random network polymers primarily composed of tetrahedrally hybridized carbon atoms, each having one hydride substituent, exhibiting the generic formula [HC]n. PHC is made from bromoform, a liquid halocarbon that is commercially manufactured from methane. At room temperature, poly(hydridocarbyne) is a dark brown powder. It can be easily dissolved in a number of solvents (tetrahydrofuran, ether, toluene etc.), forming a colloidal suspension that is clear and non-viscous, which may then be deposited as a film or coating on various substrates. Upon thermolysis in argon at atmospheric pressure and temperatures of 110°C to 1000°C, decomposition of poly(hydridocarbyne) results in hexagonal diamond (Lonsdaleite).
More recently poly(hydridocarbyne) has been synthesized by a much simpler method using electrolysis of chloroform (May 2008) [1] and hexachloroethane (June 2009).[2]
The novelty of PHC (and its related polymer poly(methylsilyne)) is that the polymer may be readily fabricated into various forms (e.g. films, fibers, plates) and then thermolized into a final hexagonal diamond ceramic.
[edit] References
- Bianconi P et al. (2004). "Diamond and Diamond-like Carbon from a Preceramic Polymer". Journal of the American Chemical Society 126 (10): 3191–3202. doi:10.1021/ja039254l. PMID 15012149.
- Bianconi P et al. (2004). "High molecular weight polymers". http://www.patentdebate.com/PATAPP/20040010108. (US patent application)
- Toppare L et al. (May 2008). "Facile Synthesis of Poly(hydridocarbyne): A Precursor to Diamond and Diamond-like Ceramics". Journal of Macromolecular Science, Part A 45 (5): 358–363. doi:10.1080/10601320801946108.
- Toppare L et al. (June 2009). "Electrochemical polymerizatıon of hexachloroethane to form poly(hydridocarbyne): a pre-ceramic polymer for diamond production". Journal of Materials Science 44 (11): 2774–2779. doi:10.1007/s10853-009-3364-4.
[edit] Notes
- ^ Toppare L et al. (2008) Facile Synthesis of Poly(hydridocarbyne): A Precursor to Diamond and Diamond-like Ceramics, Journal of Macromolecular Science, Part A 45 (5), May, 358–363, doi=10.1080/10601320801946108.
- ^ Toppare L et al. (2009) Electrochemical polymerizatıon of hexachloroethane to form poly(hydridocarbyne): a pre-ceramic polymer for diamond production, Journal of Materials Science 44 2774–2779, doi=10.1007/s10853-009-3364-4.
[edit] External links
- Facile Synthesis of Poly(hydridocarbyne): A Precursor to Diamond and Diamond-like Ceramics
- Liftport Staff Blog discussion
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