Talk:Polylactic acid

message: 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)
thread_title: Untitled

message: 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)
replies: text: Can, possibly. Just do it (see why)! q:) Vinne2 (talk) 17:53, 20 July 2011 (UTC)
thread_title:  1st Section 

message: ... but strictly a dimer!  — Preceding unsigned comment added by 150.227.15.253 (talk) 09:35, 31 January 2014 (UTC)
thread_title:  Lactide is not a monomer 

message: 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)
thread_title:  Production 

message: *I decided to merge the info contained in article polylactide into polylactic acid as suggested. Both articles dealed with the same subject. I believe all relevant information of both articles has been inclueded and there should be no duplicate info.
Berserker79 12:55, 31 August 2005 (UTC)
replies: text: PLA can be derived from sources such as the unused parts (that would normally be thrown out, I might add) of the sugar cane, and other carbohydrate-rich crops. Other ways of agricultural production are being researched to exclude fossil fuels, I'm quite sure. If you're going to go by that reasoning, then there is really no point in the word 'sustainable' as every aspect of our lives currently revolves around fossil fuels, which are not renewable. ~Deadly-Bagel (talk)
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)
thread_title:  Merging 

message: 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)
thread_title:  Biodegradable stents 

message: "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)
replies: text: I am curious about this too. I heard about polylactic acid while reading about the RepRap project, where they are trying to use it because it is environmentally friendly and can be produced from vegetables, which should be possible for communities in the developing world. But manufactured items that start biodegrading the minute they come out of the fabber might not be very useful, or at least not useful for a long time. -- WillWare (talk) 00:07, 25 February 2008 (UTC)
thread_title: Durable Applications

message: 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)
replies: text: I also think it's a good idea, but I lack the expertise to do anything more complicated than copy this list to a "list of biodegradable polymers" page. Anyone else want to step up? :) Indeterminate 09:16, 25 July 2007 (UTC)
thread_title:  New article? 

message: 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)
thread_title:  Links 

message: 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)
replies: text:  Recycling here applies to commercial and industrial rather than backyard composting recycling. The text is currently explaining the thermal (heat-based) recycling by melting it down and re-purposing or hydrolysis. The problem is that this cradle-to-cradle recycling is doubtful and personal use has shown that degradation of the material does occur with repeated changes. ChrisGualtieri (talk) 00:14, 19 June 2015 (UTC)
thread_title:  Recycling part unclear 

message: 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/
:: Thats not going to work as a citation; since it comes from a company that sells 'bio degrader' additives for plastics. The second sentence on that page gives them away rather badly; in their opinion PLA is a plot by big oil to keep control of the plastics industry.
:: Bidegradation of PLA is not as great as many want to believe, but is well described. try: http://www.material.chula.ac.th/Journal/v18-2-2/83-87%20RUDEEKIT.pdf
:: "In conclusion PLA sheet would degrade completely under real and controlled composting conditions, whereas the degradation of the PLA sheet under natural landfill and waste water treatment would required a longer time."
:: EasyTarget (talk) 15:44, 30 November 2017 (UTC)
replies: text:  It seems blatantly obvious that the labeling "biodegradeable" is used by commercial interests. That alone should be enough to change it to a descriptor that is a little more precise such as "biodegradeable under a controlled setting using higher temperatures than is common using backyard composting methods or no methods". My question (I don't edit articles often) is why is there no article "edit" function/link for that first line? (asks the noob) Crgrove (talk) 21:53, 23 January 2019 (UTC)
thread_title:  Bio-degradable 

message: PLA flammability information is not superfluous for this article. 80.243.6.98 (talk) 11:59, 27 February 2019 (UTC)
thread_title:  PLA flammability 

message: 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)
thread_title: SciFinder report

message: 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)
thread_title:  Tensile strength