Talk:Polyhydroxybutyrate

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Proposed merge with Poly-3-hydroxybutyrate[edit]

I believe both of these articles have merit, but as I understand it there is a great deal of overlap in content area, it should only be one single, good article. Could someone who knows the field add appropriate redirects to prevent this happening again! Walkerma 06:04, 30 July 2005 (UTC)[reply]

I think they should be merged because a poly-3-hydroxybutyrate section can be put within the polyhydroxybutyrate main article. User: Dr McGee 23:39, 3 November 2005

User: Tarret had already merged the PHB and P3HB articles, however I decided to work more on this article to better integrate the contents of the two original articles. I didn't feel like a P3HB paragraph was really required because all info contained in the P3HB article dealt with PHB in general not specifically the P3HB form. Berserker79 14:12, 17 November 2005 (UTC)[reply]

Thanks, this was definitely needed. Walkerma 14:54, 17 November 2005 (UTC)[reply]

Just a quick correction which may need to be made. Is Biopol really PHB? Isn't it the copolymer P(HB-HV), which is made from random HB, HV monomers?

If an expert/someone with more knowledge could confirm this it would be good. Cheers

Polylactic acid[edit]

Isn't polylactic acid also a PHA? Shouldn't it be mentioned? --Kupirijo 09:28, 19 June 2007 (UTC)[reply]

Monomers[edit]

What are the monomers that make up this stuff? Lactic acid and 2-Hydroxybutyric acid? Albmont (talk) 20:47, 22 January 2008 (UTC)[reply]

As far as I can tell, P3HB is synthesized by microorganisms using hydroxybutyryl-CoA (hydroxybutyric acid coupled with Coenzyme A). Chemical synthesis likely uses hydroxybutyric acid as well; I'm not 100% sure and someone else with more polymer chemistry knowledge should confirm if this is corret, but I think you may prepare PHB by means of ring-opening polymerization with hydroxybutyric acid.

On the other hand lactic acid has nothing to do with PHB, it is used to prepare polylactide (PLA) or its copolymers (e.g. PLGA). Berserker79 (talk) 18:19, 23 January 2008 (UTC)[reply]

Glass Transition Temperature[edit]

The glass transition temperature is incorrectly stated as 15 °C. I believe it is close to 150 °C but am not sure about the exact number.

138.67.32.49 (talk) 19:15, 23 June 2008 (UTC)Nathan[reply]

It's actually about 0 °C for amorphous PHB, but rises on crystallization/ageing to around room temperature. I'll see if I can find an online source for that. -- Phil Barker 19:03, 27 June 2008 (UTC) —Preceding unsigned comment added by Philbarker (talk • contribs)

A few recommendations...

The first sentence of the thermoplastics section reads "Currently, plastics and synthetic polymers are mainly produced from hydrocarbons, which do not decompose and they are stored, burnt or recycled at end of life."

This isn't quite accurate. All organic compounds, including PHB can be considered hydrocarbons. The first sentence should say something to the effect that most plastics are made from petroleum. They have a chemical formulas that do not easily decompose.

As far as I can tell only a small percentage of plastics are recycled, most end up in landfills and being inert creates a problem because they do not readily decompose. — Preceding unsigned comment added by 140.211.70.173 (talk) 21:31, 31 May 2011 (UTC)[reply]

Related technology or companies[edit]

It appears that Newlight Technologies is a new player in PHB production. It would ne nice to see a section explaining their path to acquiring rights tot his technology and how their production methods vary form the content of this article. See https://www.newlight.com/technology