The key role of antioxidant transformation products in the stabilization mechanisms—A critical analysis

Pospı́šil, J.

doi:10.1016/0141-3910(91)90113-6

Cited by 61 publications

(25 citation statements)

References 26 publications

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“…Mechanisms of stabilization by hindered phenols are reviewed elsewhere [48,49,50]. Despite the reported mechanistic complexity, the following stabilization scheme:…”

Section: Proposal Of a Kinetic Modelling For Pe + Phenolsmentioning

confidence: 99%

Kinetic modelling of phenols consumption during polyethylene thermal oxidation

Richaud¹

2013

European Polymer Journal

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“…Mechanisms of stabilization by hindered phenols are reviewed elsewhere [48,49,50]. Despite the reported mechanistic complexity, the following stabilization scheme:…”

Section: Proposal Of a Kinetic Modelling For Pe + Phenolsmentioning

confidence: 99%

Kinetic modelling of phenols consumption during polyethylene thermal oxidation

Richaud¹

2013

European Polymer Journal

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“…The phenol systems have shown longer period of stabilization than phenol-free systems. The longest period of stabilization was explained through the interaction between hindered phenol and hindered amine [20][21][22][44][45][46][47][48]. Our experimental results demonstrated that the synergism and antagonism of the binary, ternary and quaternary stabilizer systems were almost similar in LDPE, iPP and EP matrices indicating that the interaction/ mechanisms of stabilizers are same, but LDPE was highly stabilized than iPP and EP matrices.…”

Section: Kinetics By Carbonyl Group Evolutionmentioning

confidence: 51%

Stabilization of γ-sterilized low-density polyethylene by synergistic mixtures of food-contact approval stabilizers

et al. 2017

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In our previous studies, we have found the synergistic combinations of stabilizers which follow different mechanisms of stabilization and are approved for food contact applications. The present attempt is to test the potentials of those systems in stabilizing c-sterilized lowdensity polyethylene (LDPE). The results were discussed by comparing the stabilizing efficiency of mixtures with and without phenol systems as well as with their counterparts of isotactic polypropylene (iPP) and ethylene-propylene copolymers (EP) matrices. LDPE has been melt-mixed with tertiary hindered amine stabilizer (tert-HAS), oligomeric HAS stabilizer, phenolic and organo-phosphite antioxidants and subjected to c-sterilization. Stabilization in terms of changes in oxidation products, tensile properties, yellowing and surface morphology was evaluated by FT-IR spectroscopy, Instron, colorimetry, and scanning electron microscopy (SEM), respectively. The results of the present study confirm the validity of those systems for protecting various polyolefins against c-sterilization. The results showed that the synergism, antagonism and the trend in stabilization efficiency of the binary, ternary and quaternary stabilizer systems were almost similar in LDPE, iPP and EP matrices. The binary system of oligomeric HAS and tert-HAS has shown the antagonistic effect of stabilization, whereas their combination with organophosphite has exhibited synergistic effect even at higher doses of c-sterilization. The combination of oligomeric HAS, tert-HAS, organo-phosphite and hindered phenol exhibited improved stabilization efficiency than single or binary additive systems. The phenol systems have shown long term of stability than that of phenol-free systems. It was found that the consumption of oligomeric stabilizer significantly depends on the components of stabilization mixture. It was concluded that the stability of polyolefins (LDPE, iPP and EP) against c-sterilization can be achieved by blends of different stabilizers which are approved for food contact applications.

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“…Another important group amongst the secondary antioxidants are so-called thiosynergists. It has been shown that these sulfur-containing antioxidants have a high contribution to long-term heat protection of polymers [10,11]. It is known that the interaction between additives in a polymeric formulation can be complex and can result in synergism or antagonism [6,12e16].…”

Section: Introductionmentioning

confidence: 99%

Analytical evaluation of the performance of stabilization systems for polyolefinic materials. Part II: Interactions between hindered amine light stabilizers and thiosynergists

Beißmann

Grabmayer

Wallner

et al. 2014

Polymer Degradation and Stability

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a b s t r a c tIn the present study, the applicability of high-performance liquid chromatography hyphenated with highly sophisticated mass spectrometric detection (HPLC-MS) for analysis of hindered amine light stabilizers (HALS), thiosynergists and their conversion products is demonstrated. Degradation pathways as well as interactions between these stabilizer groups were successfully studied by analytical evaluation of model formulations after accelerated aging in the polymer-mimicking solvent squalane. Binary mixtures including HALS and thiosynergist as well as three component systems additionally including a phenolic antioxidant were investigated. Results showed that transformation pathways of HALS are highly influenced by the presence of sulfur-containing compounds and no aminoxyl radicals (typical reactive intermediates of HALS) were observed in these mixtures. To get an understanding of the effect of this altered stabilization mechanism on the protection of the polymer, rating of stabilization efficacies was performed by comparing the amount of degradation products derived from squalane using different formulations.

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The key role of antioxidant transformation products in the stabilization mechanisms—A critical analysis

Cited by 61 publications

References 26 publications

Kinetic modelling of phenols consumption during polyethylene thermal oxidation

Kinetic modelling of phenols consumption during polyethylene thermal oxidation

Stabilization of γ-sterilized low-density polyethylene by synergistic mixtures of food-contact approval stabilizers

Analytical evaluation of the performance of stabilization systems for polyolefinic materials. Part II: Interactions between hindered amine light stabilizers and thiosynergists

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