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Showing 1 to 8 of 8 for “"Hindered phenol"”.
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Oxidation and stabilisation chemistry of metallocene-based polyolefins during melt processing
… higher susceptibility of oxidative degradation. Hindered phenol and lactone antioxidants were shown to be effective in the stabilization of m-LLDPE melt when they were singly used in TSE extrusion. The combination of hindered phenol and phosphite has synergistic effect on m-LLDPE stabilization …
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Time controlled photo-oxidation of polyolefins by polymer bound additives
… polymer (LDPE and PP) was found to be of a hindered phenol type, which was found to antagonise with ZnDNC when used in combination with the photoactivators.
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The antioxidant role of vitamin E in polyolefins
… to inhibit or minimise oxidative degradation. Hindered phenolic antioxidants are important stabilisers for polyolefins. However, hindered phenols undergo chemical transformations while performing their antioxidant function during processing and fabrication. In addition, antioxidants are subject …
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Mechanisms of antifatigue agents used in natural rubber
… number of compounds containing quinonoid or hindered phenol functions were examined for their roles as antifatigue agents. Among the evaluated quinones and phenols expected to have macroalkyl radical scavenging ability, BQ, αTOC, γTOC and GM showed relatively good performance for fatigue …
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Stabilisation of isocyanate cross linked polybutadiene binder
… the rocket motor is required. At present the bis-hindered phenol Calco 2246 is used as a thermal oxidative stabiliser, but it's performance is only adequate. This has led to the search for a more efficient stabiliser system. To hasten the evaluation of new antioxidant systems the use of dynamic …
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Reactive processing of polyolefins using antioxidant systems
Various monoacrylic compounds containing a hindered phenol function (e.g.3,5-di-tert.-butyl-4-hydroxy benzyl alcohol, DBBA and vinyl-3-[3',5'-di-tert.-butyl-4-hydroxy phenyl] propionate, VDBP), and a benzophenone function (2-hydroxy-4-[beta hydroxy ethoxy] benzophenone, HAEB) were synthesised and …
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Investigation of the oxidative degradation mechanisms and melt stabilisation of a new generation metallocene polytehylene
… both polymers with synergistic combinations of a hindered phenol (Irganox 1076) and a phosphite (Weston 399) at low concentrations has shown a high extent of melt stabilisation in both polymers (extrusion temperatures 210-285°C and screw speeds 50-200rpm). The best Irganox 1076/Weston 399 system …
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Exposure to Synthetic Antioxidants Disrupt Early Development in the Frogs Silurana Tropicalis and Lithobates Pipiens
… on the environment and wildlife. Two synthetic phenolic antioxidants, 4,4’-thiobis(6-t-butyl-m-cresol) (CAS 96-69-5; TBBC) and 2,4-di-tert-butylphenol (CAS 96-76-4; DTBP) were chosen to evaluate their potential toxicity and developmental disruption on two amphibian species. Both, TBBC and DTBP, …