Lifetime prediction of ABS polymers based on thermoanalytical data

Rosík, L.; Kovářová, Jana; Pospíšil, J.

doi:10.1007/bf02135023

Cited by 19 publications

(7 citation statements)

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“…The concept of thermal analysis evaluation of antioxidant effectiveness is based on the ability of a given antioxidant to suppress the magnitude of the oxidation exotherm [16]. Figure 1 shows that the differences in dynamic DSC characteristics are very obvious in ABS graft copolymers stabilized with different types of antioxidants.…”

Section: Resultsmentioning

confidence: 99%

“…3.1 Dynamic DSC measurement DSC measurement for the elucidation of thermal oxidation of ABS powder is a very straightforward method due to a very explicit heat evolution accompanying the reaction of polybutadiene with air oxygen which is clearly seen in thermal analysis evaluation as a pronounced exotherm on the DSC curves [16]. The concept of thermal analysis evaluation of antioxidant effectiveness is based on the ability of a given antioxidant to suppress the magnitude of the oxidation exotherm [16].…”

Section: Resultsmentioning

confidence: 99%

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Performance and synergistic effect of phenolic and thio antioxidants in ABS graft copolymers

Guo

Wang

et al. 2010

Front. Chem. Sci. Eng.

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The synergistic effect of phenolic and thio antioxidants on the stabilization of acrylonitrile-butadienestyrene (ABS) graft copolymers has been studied. Three commercial antioxidants Irganox245, Irganox1076 and dilauryl thiodipropionate (DLTP) were selected. Formulations based on hindered phenols and secondary antioxidant DLTP were prepared. Stabilization was monitored in terms of changes in the functional groups (oxidation products), tensile properties and yellowness index. Differential scanning calorimetry (DSC) and thermogravimetry (TG) were also used to assess the stability. The results indicated that the combination of Irganox245 and DLTP showed much better stabilization effect than the individual components due to the strong synergistic effect. Only weak synergism could be observed in the formulation that contained Irganox1076 and DLTP. Irganox1076 and Irgnox1076/DLTP exhibited similar behaviors between antioxidants with the highest and lowest efficiencies.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Performance and synergistic effect of phenolic and thio antioxidants in ABS graft copolymers

Guo

Wang

et al. 2010

Front. Chem. Sci. Eng.

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“…As noted earlier, substantial evidence for non-Arrhenius behavior has now been shown for numerous polymeric materials 3,[5][6][7]19,[23][24][25][26][27][28][29] . The most compelling evidence comes from the monitoring of the same material property over an extended temperature range that is broad enough to confirm the non-Arrhenius character directly.…”

Section: Chloroprene (Neoprene) Cable Jacketing Materialsmentioning

confidence: 99%

Review of nuclear power plant safety cable aging studies with recommendations for improved approaches and for future work.

Gillen¹,

Bernstein²

2010

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Many U. S. nuclear power plants are approaching 40 years of age and there is a desire to extend their life for up to 100 total years. Safety-related cables were originally qualified for nuclear power plant applications based on IEEE Standards that were published in 1974. The qualifications involved procedures to simulate 40 years of life under ambient power plant aging conditions followed by simulated loss of coolant accident (LOCA). Over the past 35 years or so, substantial efforts were devoted to determining whether the aging assumptions allowed by the original IEEE Standards could be improved upon. These studies led to better accelerated aging methods so that more confident 40-year lifetime predictions became available.Since there is now a desire to potentially extend the life of nuclear power plants way beyond the original 40 year life, there is an interest in reviewing and critiquing the current state-of-the-art in simulating cable aging. These are two of the goals of this report where the discussion is concentrated on the progress made over the past 15 years or so and highlights the most thorough and careful published studies. An additional goal of the report is to suggest work that might prove helpful in answering some of the questions and dealing with some of the issues that still remain with respect to simulating the aging and predicting the lifetimes of safety-related cable materials. EXECUTIVE SUMMARYMany U. S. nuclear power plants are approaching 40 years of age and there is a desire to extend their life for up to 100 total years. Safety-related cables were originally qualified for nuclear power plant applications based on IEEE Standards that were published in 1974. The qualifications involved procedures to simulate 40 years of life under ambient power plant aging conditions followed by simulated loss of coolant accident (LOCA). Over the past 35 years or so, substantial efforts were devoted to determining whether the aging assumptions allowed by the original IEEE Standards could be improved upon. These studies led to better accelerated aging methods so that more confident 40-year lifetime predictions became available.In particular, three of the aging assumptions used were found to be overly simplistic. Thermal aging was typically carried out at a few high temperatures, then they were modeled with an Arrhenius function to derive an Arrhenius activation energy E a and finally the results were extrapolated to ambient conditions assuming no change in E a . Recent studies show that E a often drops at low temperatures, reducing the extrapolated lifetime. For radiation aging, an equal damage, equal dose assumption (e.g., no dose rate effects) was used. Careful studies have now shown that dose rate effects that reduce extrapolated material lifetime are both common and expected and come from several different mechanisms. Finally, for simulating combined radiation plus thermal environments, sequential aging (usually thermal aging followed by room temperature radiation aging) was allowed whereas rece...

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“…Teh's group successfully improved to a series of eight cycles of oven aging at 100 • C for 72 h per cycle, or five cycles of anaerobic repeated extrusion at 240 • C. We chose the temperature at 100 and 240 • C was because these temperatures presented greater challenge for the additives to maintain the same performance of the materials. In addition, it was more intuitively to compare the differences of each additives in the protective ability [6,[29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

GM-Improved Antiaging Effect of Acrylonitrile Butadiene Styrene in Different Thermal Environments

Wang

Chen²,

Lan³

et al. 2019

Polymers

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A stabilizer called 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylbenzyl)-4-methylphenyl acrylate (GM) was mixed in acrylonitrile butadiene styrene (ABS) with the same amount of 9-bis(octadecyloxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane (DSPDP), octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (Irganox 1076) and tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate (Irganox 3114) to investigate the influence of additives on the antiaging effect of ABS in oven aging or repeated extrusion aging. It was found that the ABS doped with the GM stabilizer showed a better yellowing resistance and thermal stability than the ABS doped with other antioxidants. Owing to the fact that the stabilizer can act on the free radicals before it has been peroxidized, it could trap the free radicals as a consequence of directly blocking the oxidation process of the active species, thus solving the problem of oxidative degradation of the materials from the source. This work provides guidance for improving thermal stability of ABS, indicating a promising potential for industrial application.Polymers 2020, 12, 46 2 of 10 the thermal stability of the ABS resin by adding carbon black (CB) to the ABS [24]. Yan's group enhanced the electrical conductivity and thermal conductivity of the ABS via the addition of reduced graphene oxide (rGO) in the ABS resin, because it can tightly wrap the rGO sheet on the surface of ABS microspheres [25]. In addition, Allen's group used other stabilizers to conduct a comprehensive study of K-resin by both thermal-aging degradation and photo-aging degradation [26]. However, the doping strategy also brings about changes in the color-phase morphology or other properties thereof. This dilemma makes it difficult to explore the improved thermal stability for the ABS resin [27].Here, we successfully obtained high thermal stability ABS through a doping strategy without affecting the properties of ABS itself.A systematic study was carried out to investigate effects of 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylbenzyl)-4-methylphenyl acrylate (GM), 9-bis(octadecyloxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane (DSPDP), octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (Irganox 1076) and tris(3,5-ditert-butyl-4-hydroxybenzyl) isocyanurate (Irganox 3114) antioxidants on the thermal aging of ABS in two different thermal environments, a 100 • C convection oven and a 240 • C extruder simulating the extreme environment. It was found that the ABS doped with the GM stabilizer showed better yellowing resistance and thermal stability than the ABS doped with other antioxidants. Owing to the fact that the stabilizer can act on the free radicals before it has been peroxidized, it could trap the free radicals as a consequence of directly blocking the oxidation process of the active species, thus solving the problem of oxidative degradation of the materials from the source. Hence, the GM antioxidant can greatly improve thermal stability of the ABS in the convection oven or the extruder. This wo...

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Lifetime prediction of ABS polymers based on thermoanalytical data

Cited by 19 publications

References 0 publications

Performance and synergistic effect of phenolic and thio antioxidants in ABS graft copolymers

Performance and synergistic effect of phenolic and thio antioxidants in ABS graft copolymers

Review of nuclear power plant safety cable aging studies with recommendations for improved approaches and for future work.

GM-Improved Antiaging Effect of Acrylonitrile Butadiene Styrene in Different Thermal Environments

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