Thermal and photochemical oxidation of polypropylene. Influence of residual catalyst levels in unstabilised diluent and gas phase polymers
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Long term thermo-oxidative degradation and stabilization of polypropylene (PP) and the implications for its recyclability
2023, Polymer Degradation and StabilityCharacterising the deterioration of different plastics in air and seawater
2019, Marine Pollution BulletinCitation Excerpt :Crosslinks of long polymer chains provide the material's cohesion in many types of plastic; the lower the molecular weight, the less mechanically stable the material is (Sawai et al., 2006). Light, especially UV radiation, causes polymer chains to break (Allen et al., 1983; Ranby, 1989; Gardette et al., 1995) in a reaction called photo-oxidation, which has been cited as the most important environmental cause of polymer deterioration (Carrasco et al., 2001). For example polyethene and polypropylene lose extensibility, mechanical integrity and molecular weight when exposed to UV radiation (Hamid and Prichard, 1991; Andrady et al., 1993a; Marek et al., 2006; Obadal et al., 2006; Singh and Sharma, 2008).
Interactions between a phenolic antioxidant, moisture, peroxide and crosslinking by-products with metal oxide nanoparticles in branched polyethylene
2016, Polymer Degradation and StabilityCitation Excerpt :Introducing nanoparticles into polymers introduces another risk. Ionic species present at the nanoparticle surfaces can potentially increase radical formation and thus increase the antioxidant consumption rate [36,38,63]. Nanoclay contains notoriously large quantities of ionic species and nanoclay composites therefore show short OITs [64,65].
Effects of melt processing conditions on photo-oxidation of PP/PPgMA/OMMT composites
2010, Polymer Degradation and StabilityAspects of the thermal and photostabilisation of high styrene-butadiene copolymer (SBC)
2006, Polymer Degradation and StabilityCitation Excerpt :After this period the sheets were washed thoroughly with 2-propanol and left to dry for 24 h. This effect may remove active metal ion species and has proved to be successful in the work on polypropylene [12]. Treatment 4: A reaction mixture of 2% w/v of phosphoric acid in 2-propanol was prepared.
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