Poly(hydridocarbyne)

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Poly(hydridocarbyne)
Formula[HC]n
Molecular mass200,000 to 100 million Daltons
Melting pointdecomposes @ 100 °C
Boiling point N/A
Density??.?? g/cm³
CAS number???-??-?
SMILES???????

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.

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".  (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. 

Notes

  1. ↑ 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.
  2. ↑ 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.

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