Effect of hydrolysability and structural features of phosphites on processing stability of isotactic polypropylene
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2021, Journal of Cultural HeritageCitation Excerpt :They are oxidized by peroxyradicals to nitroxyl radicals [85]. As HAS antioxidants, Tinuvin 292 (bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and methyl 1,2,2,6,6-pentamethyl-4-piperidyl sebacate) [85] were investigated, as preventive antioxidants tetrabutylammonium bromide, 1-ethyl-3-methylimidazolium bromide and Irgafos 168 (tris (2,4-ditert-butylphenyl) phosphite) were studied [92]. The reaction steps of the action of antioxidants of the free radical scavengers and preventive antioxidants type have been outlined in [85].
The role of organic phosphite primary structure in the overall stabilization performance in polypropylene
2017, Polymer TestingCitation Excerpt :Organic phosphites belong to the class of processing stabilizers utilized in variety of synthetic polymers, most frequently polyolefins. Together with sterically hindered phenols they provide powerful protective systems, capable of efficient protection of polymer during melt processing [1–14]. High protective performance is a consequence of a synergistic effect, making the efficiency of phenol-phosphite blend higher than as if the efficiencies of both single components were purely added up.
Interaction of antioxidants with carbon black in polyethylene using oxidative induction time methods
2014, Geotextiles and GeomembranesDegradation of cellulose at the wet-dry interface. II. Study of oxidation reactions and effect of antioxidants
2014, Carbohydrate PolymersCitation Excerpt :In this study the effects of the HAS Tinuvin 292 (bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and methyl 1,2,2,6,6-pentamethyl-4-piperidyl sebacate) were investigated. Preventive antioxidants such as tetrabutylammonium bromide, 1-ethyl-3-methylimidazolium bromide and Irgafos 168 (tris(2,4-ditert-butylphenyl)phosphite), a phosphite with presumably better hydrolytic stability than most phosphites (Tocháček & Sedlář, 1993), were also included in this study (Scheme 2). The molecular structures of the antioxidants can be found in Table 1.
Processing degradation index (PDI) - A quantitative measure of processing stability of polypropylene
2012, Polymer TestingCitation Excerpt :In many cases, however, where there is a need to plot the processing stability against some other variable, such as e.g. temperature, polymer property or concentration of additives, there appears a problem. A single parameter (=single number) sufficiently reflecting the processing stability, i.e. the processing curve position, is missing [3–20]. The issue of this work is to propose a way of quantitative evaluation of PP processing stability that defines a single numerical parameter calculated from the processing curve, which sufficiently describes the behaviour of polypropylene during multiple extrusion.
Modelling of thermal oxidation of phosphite stabilized polyethylene
2011, Polymer Degradation and Stability