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Does the mention of the substance's use by a cigarette company: "Philip Morris's iQOS heets include PLA to slow the vapour down without absorbing it, giving it time to cool to a more pleasant temperature before inhaling it" constitute advertising? The use of the brand name and the language "more pleasant" seems non-neutral in tone. Antifracture ( talk) 14:23, 21 August 2019 (UTC)
Can sugarcane bagasse be used as a substrate in citric acid production by Aspergillus niger ?
The name "polylactic acid" does not follow any naming convention, but is not ambiguous.
Poly lactic acid is not an IUPAC name because "lactic acid" is not a IUPAC name. Much like poly ethylene (not an IUPAC name) and other polymers, the polymer is named after the starting monomer, not the resulting polymer (poly ethylene is a straight chain with no double bonds, whereas ethylene is C2H4 [has a double bond]).
"and potentially leading to ambiguity (PLA is not a polyacid (polyelectrolyte), but rather a polyester)"
The chemical structure illustration should have a straght line where the squiggly line is, because it is a just a methyl group for polylactide.
Discuss... — Preceding unsigned comment added by 72.37.244.76 ( talk) 22:59, 7 July 2011 (UTC)
There is something lacking the the claim that it is difficult to recycle PLA. Later sections in the page include Loopla as a company capable of recycling PLA through the fairly simple thermoprocessing. Can the issue of recycling be broken up into technical feasibility (not that difficult) and practical feasibility ( collection is basically a non starter, problems with contaminating recycling, studies on practicality. -- Smrf ( talk) 00:22, 20 July 2011 (UTC)
CAS Number is 9051-89-2. Please check!
... but strictly a dimer! — Preceding unsigned comment added by 150.227.15.253 ( talk) 09:35, 31 January 2014 (UTC)
The graphic shows condensation reactions but I think the Stoichiometry is not accurate. The dimer formation produces two water molecules, so shouldn't the right arrow show "-2 H2O" instead of only "-H2O"? — Preceding unsigned comment added by 190.247.64.79 ( talk) 17:30, 22 July 2013 (UTC)
Now that you point it out, I wonder the same thing about the Stoichiometry, although I don't really know how to edit the image where the reaction is displayed. [Tacitly 1] Tacitly ( talk) 23:19, 23 April 2016 (UTC)
Berserker79 12:55, 31 August 2005 (UTC)
17/10/05: Fixed Classmates Vandalism.
Comment -
Where does the idea come from that PLA is a sustainable (renewable) plastic material, as opposed to petroleum-based plastics. This claim ignores the huge amounts of petroleum required for the agricultural production of the feedstocks for PLA. See quote below from article.
--Your point is well-taken, production of PLA currently requires energy (electricity for reactors, fossil fuel for transportation of corn). On the other hand, unlike crude oil derived materials like PE, PP, PS, PVC, etc, PLA material is sourced from a renewable source (i.e. plant). It is also eventually possible to sustainably source electricity (via wind power, solar thermal, etc). And transportation might be possible via electric vehicle. So from a purist standpoint, PLA as produced today is not 100% sustainable. But then, what plastic material is today? PLA probably comes closest to 'sustainable' currently, and can be 100% sustainable in the future. Mill haru ( talk) 16:03, 12 September 2010 (UTC)
"The degree to which the price will fall, and the degree to which PLA will be able to compete with NON-SUSTAINABLE petroleum-derived polymers, is uncertain".
Comment: Using "sustainable" here might not make any sense. Perhaps "less environmental damaging", or "an environmental better solution", but using "sustainable" can be misleading. Especially, if it depends on a use of non-fossil (renewable) energy source in the production and transportation, which is not the case always. Then it can actually be very far away from being "sustainable".-- Duckislate ( talk) 23:50, 9 February 2011 (UTC)
A stent is a wire mesh tube that is used to open up arteries. Abbott Laboratories has developed a bioabsorbable stent made of polylactic acid. Since I work for Abbott I would rather someone else make the entry. Otherwise I may add it at a later time. Scot.parker 13:49, 26 October 2006 (UTC)
"The physical blend of PDLA and PLLA can be used to widen the application window and include applications such as woven shirts (ironability), microwavable trays, hot-fill applications and even engineering plastics (in this case the stereocomplex is blended with rubber-like polymer such as ABS)"
I'm rather skeptical about use of any variety of polylactide for a number of those things, because of the degradation in the presence of moisture and/or bacteria, both of which are likely to be present. The PURAC site doesn't make any mention of it, so sourcing it might be nice. I know about the medical applications and the disposable goods (packaging, compost bags, plastic cutlery, etc) and can provide a source for those if needed. But I haven't seen anything on "woven shirts" for example, or in non-biomedical engineering plastics. Gjc8 12:50, 18 February 2007 (UTC)
I notice the "see also" section at the bottom for biodegradable polymers. Is the topic of biodegradable polymers worthy of an article of it's own, or possibly a new section within polymers? The list is beneficial information, but just grouping them here seems ungood. Verdatum 21:57, 6 June 2007 (UTC)
What i advise as a solution is a category of list of biodegradable polymers or a article list of biodegradable polymers — Preceding unsigned comment added by SirSharp ( talk • contribs) 19:26, 22 October 2022 (UTC)
I'm not a chemist - I have no idea what this is. I added a link from "cracking plants" to Cracking (Chemistry), but that's just a guess from reading both pages. Is the oligomer -> dimer process what's being referred to as "cracking"? Indeterminate 09:16, 25 July 2007 (UTC)
monomer - one molecule, dimer - two molecules bonded, trimer - three molecules, etc. Cracking is the process of taking bigger molecules and turning them into smaller molecules. In petrochemicals it is commonly used to produce ethylene, propylene and some C4 products. Cracking a molecule in two does not produce a "dimer" as a "dimer' is formed from joining two things together. - Harrumph —Preceding unsigned comment added by 141.227.3.1 ( talk) 17:10, 30 May 2008 (UTC)
The first two reference links in the article are broken, most likely due to a site reorganisation at the destination site. Does anyone have the correct links for the references cited? Cefiar ( talk) 22:35, 15 February 2011 (UTC)
The part about recycling seems unclear. Is it talking about mechanical recycling or not? I'd fix it but I have no idea what it's trying to say. — Preceding unsigned comment added by 184.163.9.163 ( talk) 23:44, 2 May 2012 (UTC)
No, the article describes chemical recycling where the plastic is broken down to it's monomers for repolymerization. Melting would probably still be considered mechanical recycling I guess? Unless the intent is to break it down rather than just melt/reform it.
See https://link.springer.com/article/10.1007/s10924-016-0777-4 and http://www.plasticsrecyclers.eu/chemical-recycling
Blaedd ( talk) 20:10, 11 March 2018 (UTC)
When chemically breaking the polymer back down to the monomer and purified, the monomer is indistinguishable from non-recycled monomer by definition. If a different material was formed, it would have a different chemical structure and wouldn't even be named the monomer. The only thing I would question would be the form of the monomer: whether it retains the same D or L form when broken down. — Preceding unsigned comment added by 165.225.34.164 ( talk) 17:10, 21 December 2018 (UTC)
Poly-lactic acid does not bio-degrade naturally and thus the first line of the article is incorrect:
http://www.biosphereplastic.com/biodegradableplastic/uncategorized/is-pla-compostable/
The result of the move request was: Not moved, oppose not countered for 6 days. (non-admin closure) — Andy W. ( talk · ctb) 20:16, 13 August 2016 (UTC)
Polylactic acid → Poly(lactic acid) – It is the correct technical spelling for this compound. Wipur ( talk) 19:44, 5 August 2016 (UTC)
PLA flammability information is not superfluous for this article. 80.243.6.98 ( talk) 11:59, 27 February 2019 (UTC)
According to Chemical Abstracts: "references (51469)>refine "Review" (1625)>refine "2014-" (348)". i.e. a review appears about weekly on this material.-- Smokefoot ( talk) 11:59, 26 September 2019 (UTC)
Under the Physical Properties section it says "The tensile strength for 3D printed PLA was previously determined."
Could the article be improved by quoting what the tensile strength was determined to be? I'm not an expert so don't want to make the edit myself.
Also does anyone have info on what the repeated stress properties are, eg under compression, vibration, etc? 148.252.132.34 ( talk) 17:45, 6 August 2023 (UTC)