Talk:Polyacetylene: Difference between revisions
Nucleophilic (talk | contribs) →New cites on early conductive polyacetylenes: adding emphasis |
Nucleophilic (talk | contribs) →New cites on early conductive polyacetylenes: modification |
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== New cites on early conductive polyacetylenes == |
== New cites on early conductive polyacetylenes == |
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Conductive polyacetylene derivatives were discovered in the ealy 1960's. The secondary literature cited, including the 1964 monograph entitled "Organic semiconductors", is quite definite on this issue. E.g., concerning one such report, page 128 of the 1964 monograph notes-- "The conductivity measurements of the colored '''polyacetylenes''' produced showed typical semiconductor behavior (10-4 ohm-cm at 25C degrees )". Be happy to post a copy of this page and others, if necessary. But it should not be. [[User:Nucleophilic|Nucleophilic]] ([[User talk:Nucleophilic|talk]]) 23: |
Conductive polyacetylene derivatives were discovered in the ealy 1960's. The secondary literature cited, including the 1964 monograph entitled "Organic semiconductors", is quite definite on this issue. E.g., concerning one such report, page 128 of the 1964 monograph notes-- "The conductivity measurements of the colored '''polyacetylenes''' produced showed typical semiconductor behavior (10-4 ohm-cm at 25C degrees )". |
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Almost metallic-- In fact, my impression is that this is about as good any anybody can do these days. Be happy to post a copy of this page and others, if necessary. But it should not be. [[User:Nucleophilic|Nucleophilic]] ([[User talk:Nucleophilic|talk]]) 23:42, 8 February 2011 (UTC) |
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Revision as of 23:42, 8 February 2011
structural drawing
Is there a template to request a drawing of a molecule?
How easy to polymerize
How easy is it to get acetylene to polymerize?
- Now a days poly(acetylene) is generally not made by polymerizing acetylene, which is a highly flammable gas that spontaneously oligomerizes upon concentration. The most common synthesis now is using special metathesis catalysts deveopled by Professor Grubs at Cal Tech (which are known as Grub's catalysts) on molecules like cyclooctatetraene. Acetylene itself polymerizes in a similar fashion to ethylene; anionic, cationic, and radical polymerizations will all work. I'm not sure what you mean by "how easy" it is to polymerize it... Either it polymerizes or it doesn't; there is really no difficulty associated with it. Fearofcarpet 20:03, 18 Mar 2005 (UTC)
Cis
I think a structural formula for the cis configuration would be appropriate.
'Acetylene black' as a synonym for 'polyacetylene'
I am suspicious of the use of 'acetylene black' as a synonym for 'polyacetylene'. I've been looking into carbon black for battery manufacture. Acetylene black is a form of carbon black as discussed in the quote below:
Carbon black is a powdered form of elemental carbon manufactured by the vapour-phase pyrolysis of hydrocarbon mixtures, such as heavy petroleum distillates and residual oils, coal-tar products, natural gas and acetylene. ... Carbon blacks are categorized as acetylene black, channel black, furnace black, lampblack or thermal black, according to the process by which they are manufactured.
Elsewhere (no reference) it was noted that the conductivity of various manufactures of carbon black depend on the residual hydrogen content, etc. I suspect that polyacetylene can be an impurity in acetylene black due to incomplete pyrolysis. Especially since this claim was unreferenced, I thought it prudent to remove it. Perhaps someone can substantiate it and reinsert the statement.
Tendermecies (talk) 15:52, 18 May 2008 (UTC)
New cites on early conductive polyacetylenes
Conductive polyacetylene derivatives were discovered in the ealy 1960's. The secondary literature cited, including the 1964 monograph entitled "Organic semiconductors", is quite definite on this issue. E.g., concerning one such report, page 128 of the 1964 monograph notes-- "The conductivity measurements of the colored polyacetylenes produced showed typical semiconductor behavior (10-4 ohm-cm at 25C degrees )".
Almost metallic-- In fact, my impression is that this is about as good any anybody can do these days. Be happy to post a copy of this page and others, if necessary. But it should not be. Nucleophilic (talk) 23:42, 8 February 2011 (UTC)