Talk:Rayon

Rayon synthesis picture

As of 15 November 2005 I've put this picture in the article, but if anyone who has a better knowledge of rayon could comment I'd greatly appreciate it: I don't have a very thorough knowledge of the synthesis of rayon, but I seem to understand that an important part of the process comprises the alkali treatment and "xanthation" with carbon disulfide of cellulose (which is what is drawn in the mentioned picture). Should the picture be left in the article? Is there any modification I should consider? TIA Berserker79 18:04, 15 November 2005 (UTC)

Rayon is not synthetic, and it not synthesized, thus there is no synthesis of rayon. It is a regenerated cellosic fiber; it is no more synthetic than hemp rope or cotton cloth, both of which are commonly heavily processed and chemically treated during conversion from raw material into finished product. — Preceding unsigned comment added by 100.34.23.13 (talk) 02:50, 13 November 2021 (UTC)

Curent picture

Simplified view of the xanthation of cellulose.

The following picture illustrating the shift between cellulose and viscose is wrong. There should be an oxygen in the cycle, between the glycosidic bond and the carbon bearing CH2OH group of the cycle, instead of a carbon bearing an hydroxyl group. Wikichimiste (talk) 07:56, 15 December 2021 (UTC)

Additional info on rayon synthesis by viscose process

see Chapter in: Regenerated cellulose fibresCalvin Woodings, Textile Institute (Manchester, England) 0 Reviewshttp://books.google.com/books/about/Regenerated_cellulose_fibres.html?id=tufL4gBjZ2UC Woodhead Publishing, 2001 - 336 pages

(1st time commenter here - appropriate to add to existing topic?)

Although the steps of the chemical process are described in good detail -- to the naïve reader it's not clear what is the purpose of performing steps 1-9? You begin with (C6H10O5)n and end up with seemingly the exact same material mixed in with: nCS2 + nNaOH. I assume this either purifies (probably not), or modifies some structural properties of the material, but I can't determine anything from the current text. Is it similar to Mercerisation of cotton for example ( which also involves treatment with alkali and acid )? I'm not a chemist or textile export and don't feel confident enough to edit the page. Jmonti824 (talk) 04:39, 16 October 2016 (UTC)

Cursory web-search reveals that around 1979 a way was found to "replace the chemically complex viscose route with a simple, pollution-free, physical cellulose dissolution route." ( With many environmental benefits. ) Actual process apparently discovered c1939 and refined c1969 years earlier. REF: DANGEROUS://www.lyocell-development.com/2012/09/the-genesis-of-sustainable-fibres-2012.html?m=1 This seems like important information to add especially if it is the process currently used and not the one currently described by the article. ( I would hope that it is, but that's off-topic. ) ( just noticed this process is also referred to as tencel in this article section: Producers. ) Jmonti824 (talk) 05:53, 16 October 2016 (UTC)

I can try to attend to these comments. The problem is that your questions are indeed penetrating, and none of the usual editors is very expert in industrial polymer technology. So it is unclear to be also why the nCS2 + nNaOH treatment gives such wondrous transformation of materials properties aside from the fact that the cellulose can be made into threads by temporary dissolving and then reverting to insoluble fiber again. The description of Lyocell should be strengthened. The PR bit about "pollution free" of course really attracts editors here, many of whom do want to see Wikipedia advocate for "goodness". I think that the technology is struggling to be competitive. --Smokefoot (talk) 13:52, 16 October 2016 (UTC)

Jmonti824, I've added some refs on lyocell, including a review and a PhD thesis which readily give the idea. I have nto attempted to disentangle the claims about history, but have stuck to the current tech. Also added similar info to Cellophane an Lyocell. HLHJ (talk) 02:13, 6 September 2020 (UTC)

References

Merge from viscose

There is a lot of overlap between regenerated cellulose (an alt name for rayon), viscose (a generic name for solubilized cellulose), and rayon (which includes the xanthate method, lyocell, and cuprammonium method). I am familiar with the area and I can barely figure out these topics. Also these articles are highly redundant. Today, I redirected regenerated cellulose. Now I propose to merge viscose into rayon.--Smokefoot (talk) 23:21, 9 August 2020 (UTC)

Rayon only comes in pink. — Preceding unsigned comment added by 205.126.15.117 (talk) 21:27, 12 November 2020 (UTC)

Link to German Wiki

Hi, please someone add a language link to the German wikipedia article about Rayon (https://de.wikipedia.org/wiki/Viskosefaser). I don't find how to add it anymore. Thanks. -- 17:18, 27 October 2022 (UTC) Tauriel (talk) 17:18, 27 October 2022 (UTC)

Hi, Tauriel. On Wikidata! If you go to the "Languages" sidebar section, at the bottom is an "Edit link" link. Follow it and you'll see how to add a language. Feel free to post on my talk page if you get stuck. HLHJ (talk) 02:15, 28 October 2022 (UTC)

"Bamboo socks" listed at Redirects for discussion

The redirect Bamboo socks has been listed at redirects for discussion to determine whether its use and function meets the redirect guidelines. Readers of this page are welcome to comment on this redirect at Wikipedia:Redirects for discussion/Log/2023 September 15 § Bamboo socks until a consensus is reached. TartarTorte 16:53, 15 September 2023 (UTC)