Talk:Polyester resin

dibasic organic acids

each word above has its own page - how about a page explaning and listing "dibasic organic acids" for the clueless like me? thanks ! — Preceding unsigned comment added by 74.178.245.252 (talk) 22:46, 16 September 2010 (UTC)

Thermosetting?

Since when is polyester resin thermosetting? When I make a Glass-reinforced plastic item, I add a catalyst to liquid polyester resin and paint it onto my fibreglass and wait for it to harden! --Slashme (talk) 06:43, 1 August 2008 (UTC)

Your question, 'Since when is polyester resin thermosetting?' makes me wonder how you ever came to make a fiberglass-reinforced-plastic item. You wrote "I add a catalyst to liquid polyester resin and paint it on my fibreglass and wait for it to harden!" --Slashme (talk) 06:43, 1 August 2008"

Did you read the manufacturer’s ‘technical data sheet’ relating to that thermosetting resin before you tried to use it to make an FRP product? Fiberglass Reinforced Plastic (FRP) is used to make FRP surface coverings, FRP plugs, FRP molds and FRP product made from molds. Liquid polyester (and liquid vinylester which a higher quality) resin is mixed with benzol peroxide or another suitable catalyst and then applied into fiberglass materials to cause the plastic to harden, preferably at or near 70 degrees. I have to guess that you bought your catalyst, resin and fiberglass at a dealer who either didn’t explain things to you or if he did he did his information was inadequate or erroneous. In other words, thermosetting polyester resin gives the ‘essence of shape’ to an FRP product. — Preceding unsigned comment added by Henry Merton (talk • contribs) 17:27, 10 January 2009 (UTC)

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Pre-accelerated unsaturated polyester resins will cold cure with MEKP and most often are used that way. Un-accelerated resins require heat and catalyst. The terms "thermosetting" and "thermoplastic" are not neccessarily literal and used only to identify whether a plastic is permanently solid and will only decompose if heated or whether it can be remelted and used again. Even then there are borderline cases. Thermoplastics contain long chain molecules which can slip over each other when heated: thermosets in their cured form are long chain molecules that have been cross-linked to immobilise them. John — Preceding unsigned comment added by 86.22.213.229 (talk) 11:39, 25 August 2009 (UTC)

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Or in other terms, because the polyester undergoes a chemical change which forms its strength it is considered a thermoset. Even though the cure temperature for this polymer is about room temperature once it cures it cannot be remelted and worked again. Thermoplastics form entanglements in the polymer chains which provide strength, but can lead to easier flow at higher temperatures. Hope that helps! Darkwraith (talk) 23:53, 20 January 2009 (UTC)

Catalyst Misnomer Citation Needed

Is a citation really needed? It is a well established fact that the organic peroxide 'catalyst' it consumed when it creates the radical. Anyone that has taken a polymer class should be able to come to the conclusion their self. Peroxides do not stabilize radicals, they produce them. Conjugated transition metals such as cobalt and copper are used as catalysts, however, in the industry they are often called 'promoters'. — Preceding unsigned comment added by 64.129.218.195 (talk) 14:11, 6 October 2011 (UTC)

Merging Polyester and Polyresin

In short words: Strongly against it! For two reasons:

1. The article on Polyresin does not state at all what kind of material it it chemically speaking. I don't know what that stuff is in the first place (anyone got an idea??).
2. Polyester is used as a structural material in glueing, bonding, mould-building, filling and so on. Therefore it should have its own article on Wikipedia.

So, if a merge is even thinkable of, it must be Polyresin blended somewhere into the bottom lines of the Polyester article. Given it is Polyester in the first place! Without that being clear the articles must stay separated.

-- Justsail (talk) 08:18, 11 June 2009 (UTC)

I am also against it. Polyresin appears to be a material that could be based on polyester or other resin and is a minor user of polyester when compared to reinforced plastics. John —Preceding unsigned comment added by 86.22.213.229 (talk) 11:42, 25 August 2009 (UTC)

I'm not convinced it would be beneficial to combine the two articles. Polyresin is simply a product that uses polyester within its make-up. 7severn7 (talk) 13:08, 8 September 2009 (UTC)

I'm working on composites and polymer for 20 years. Polyester resins (UP) especially unsaturated polyester resins shouldn't be merged w'th polyresin. —Preceding unsigned comment added by 75.83.146.9 (talk) 04:12, 2 October 2009 (UTC)

I think the article on Polyresin needs to be expanded and cited so we know what it is talking about. There was a trademarked series of Polyresin products for awhile that included polyester resin as well as sodium polyacrylate. However, the Polyresin article itself seems to refer to the generic term used to describe decorative statues, in other words, a non-specific marketing term which may refer to polyester resin, polyurethane resin, or any kind of polymer resin. I don't think Polyester and Polyresin should be merged, and I also think without further clarification, the article on Polyresin is essentially useless. Eqqman (talk) 17:44, 17 February 2012 (UTC)