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Polypropylene Pipe
editThere are pages both for copper pipe and polyethylene pipe, would a new page be merited for polypropylene pipe/tubing? --IanVG (talk) 13:21, 29 July 2021 (UTC)
Polypropylene
editVoice 2402:3A80:1BBB:A381:AA67:F784:E0C1:1B99 (talk) 02:52, 29 January 2022 (UTC)
UV degradation
editThe article has no section on susceptibility to UV radiation. PP rope, in my experience, is not suited to longterm outdoor applications, presumably breaking down by UVB/C. Assuming the black "poly pipe", ubiquitous in Australia, really is PP, its UV resistance must be due to the black filler material, or am I missing something? Doug butler (talk) 13:56, 7 March 2023 (UTC)
- Carbon black is a very cost effective means of stabilising plastic against UV but I'm not sure if its used in rope. Fillers like that can effect the machanical properties of the plastic because you usualy need to add quite a bit of them. PP will degrade in sunlight (see: Photo-oxidation of polymers) but there are various UV-stabilisers which can be used to prevent degradation. --Project Osprey (talk) 14:11, 7 March 2023 (UTC)
- I don't think I was suggesting adding a filler to rope; just commenting on its poor UV performance, which merits a sentence or two. Thanks for the link. I thought my chemistry knowledge was OK but what are "reactive oxygen species"? Ozone? Nascent atoms? Doug butler (talk) 20:56, 7 March 2023 (UTC) Ah — I just found Singlet oxygen. — I'm now know a little more. Isn't WP wonderful! Doug butler (talk) 21:04, 7 March 2023 (UTC)
- It's free radical chemistry, which can be confusing even to trained chemists. In this context reactive oxygen species include a few different compounds: peroxy radical (ROO•), which are the most reactive - but also hydroperoxides (ROOH, not to be confused with carboxylic acids) and alkoxy radicals (RO•). I keep meaning to improve these pages but it's a big job and I lack the time. Project Osprey (talk) 09:25, 8 March 2023 (UTC)
- I don't think I was suggesting adding a filler to rope; just commenting on its poor UV performance, which merits a sentence or two. Thanks for the link. I thought my chemistry knowledge was OK but what are "reactive oxygen species"? Ozone? Nascent atoms? Doug butler (talk) 20:56, 7 March 2023 (UTC) Ah — I just found Singlet oxygen. — I'm now know a little more. Isn't WP wonderful! Doug butler (talk) 21:04, 7 March 2023 (UTC)
Recycling section is really bad...
editThe recycling section looks like it was written by an eighth grader. Poor grammar, factually incorrect, and cites greenwashing on a plastic packaging company's website. I don't have the time or energy to research and correct it. Salix~Willow (talk) 22:19, 11 February 2024 (UTC)
Structure
editCan propylene polymerize in such a way that the methyl groups are not on every other carbon atom of the chain? The chain can be divided into groups of two carbon atoms that both came from the same propylene molecule, but theoretically the methyl group could be on either one of the two. Please Ping me if you answer. Eric Kvaalen (talk) 09:45, 7 September 2024 (UTC)
- I found an answer at [1]. Eric Kvaalen (talk) 12:11, 9 September 2024 (UTC)