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  2. Photo-oxidation of polymers - Wikipedia

    en.wikipedia.org/wiki/Photo-oxidation_of_polymers

    Radicals formed by photolysis may initiate the photo-oxidation in PET. Photo-oxidation of the aromatic terephthalic acid core results in its step-wise oxidation to 2,5-dihydroxyterephthalic acid. The photo-oxidation process at aliphatic sites is similar to that seen for polyolefins, with the formation of hydroperoxide species eventually leading ...

  3. Polymer stabilizer - Wikipedia

    en.wikipedia.org/wiki/Polymer_stabilizer

    Pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate): A primary antioxidant consisting of sterically hindered phenols with para-propionate groups. Primary antioxidants (also known as chain-breaking antioxidants) act as radical scavengers and remove peroxy radicals (ROO•), as well as to a lesser extent alkoxy radicals (RO•), hydroxyl radicals (HO•) and alkyl radicals (R•).

  4. Fiberglass - Wikipedia

    en.wikipedia.org/wiki/Fiberglass

    Fiberglass (American English) or fibreglass (Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber.The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass cloth.

  5. Polymer degradation - Wikipedia

    en.wikipedia.org/wiki/Polymer_degradation

    Polymer degradation is the reduction in the physical properties of a polymer, such as strength, caused by changes in its chemical composition.Polymers and particularly plastics are subject to degradation at all stages of their product life cycle, including during their initial processing, use, disposal into the environment and recycling. [1]

  6. Cured-in-place pipe - Wikipedia

    en.wikipedia.org/wiki/Cured-in-place_pipe

    A resin impregnated felt tube made of polyester, fiberglass cloth, spread tow carbon fiber or other resin-impregnable substance, is inserted or pulled through a damaged pipe, usually from an upstream access point such as a manhole or excavation. (It is possible to insert the liner from a downstream access point, but this is more risky).

  7. Biodegradable additives - Wikipedia

    en.wikipedia.org/wiki/Biodegradable_additives

    Hydrolysis or oxidation is the most important step in the mechanism since it initiates the entire process of plastic biodegradation. [5] Once hydrolysis or oxidation occurs, the microorganisms can act directly on the lower molecular weight products and utilize the carbon in these fragments as a source of energy. [citation needed]

  8. Pete Davidson strips down in tattoo-free Reformation ad as he ...

    www.aol.com/pete-davidson-strips-down-tattoo...

    Pete Davidson is the internet's "perfect boyfriend.". The former "Saturday Night Live" star stripped down as the face of fashion brand Reformation's new Valentine's Day campaign, flaunting his ...

  9. Embrittlement - Wikipedia

    en.wikipedia.org/wiki/Embrittlement

    Duplex stainless steel is widely used in industry because it possesses excellent oxidation resistance, but it can have limited toughness due to its large ferritic grain size and embrittlement tendencies at temperatures ranging from 280 to 500 °C, especially at 475 °C, where spinodal decomposition of the supersaturated solid ferrite solution ...