1993
DOI: 10.1016/0141-3910(93)90022-b
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Model experiment on the protection effect in polymers: radiolysis of liquid squalane in the presence and absence of additives

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Cited by 23 publications
(7 citation statements)
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“…Therefore the thermal stability of pure antioxidants dissolved in squalane was investigated. The apolar solvent squalane was used as it is a liquid model for polypropylene [17,26]. 10 mg of the stabilizers Irganox 1010, Irganox 1330, Irganox 3114, Irganox 1076, Irganox 1135, Cyanox 1790 and Irgafos 168 were added separately to 1 mL of the polymer-mimicking solvent squalane.…”
Section: Aging Of Pure Additives In Squalanementioning
confidence: 99%
“…Therefore the thermal stability of pure antioxidants dissolved in squalane was investigated. The apolar solvent squalane was used as it is a liquid model for polypropylene [17,26]. 10 mg of the stabilizers Irganox 1010, Irganox 1330, Irganox 3114, Irganox 1076, Irganox 1135, Cyanox 1790 and Irgafos 168 were added separately to 1 mL of the polymer-mimicking solvent squalane.…”
Section: Aging Of Pure Additives In Squalanementioning
confidence: 99%
“…In the radiolysis of linear paraf®ns such as n-C 16 H 34 , the formation of higher oligomers was observed, whereas intermediates between parent and dimer were dominant in the radiolysis of branched paraf®ns such as C 30 H 62 . 11 The scission pattern also depends on the chemical structure of the parent compound. For linear paraf®ns, the scission fragments were con®rmed to be linear saturated alkanes, and the scission probability was lowest at primary carbon atoms.…”
Section: Results and Discussion Radiolysis Of Paraffins In Vacuomentioning
confidence: 99%
“…11,14 This suggested that the two processes are faster than the energy-transfer processes. It con®rms that chain-scission originates from excited radical cations.…”
Section: Protection By Aromatic Additivesmentioning
confidence: 96%
“…We propose that, at low α doses, isoparaffins present in the PTFE matrix inhibit the radiation-induced reactions that give rise to emergent reaction products. Specifically, we surmise that hydrocarbon fragments arising from the radiolysis of isoparaffins behave as scavengers of H·, O·, and F· radicals; the radiolysis of aliphatic hydrocarbons results in production of polyenes and evolution of molecular hydrogen. At α doses ≥10 9 rad the inhibition appears to wane due to the burgeoning radical concentration that overwhelms the concentration of polyene scavengers in the polymer matrix. Evidence of such action is displayed in Figure where the signals of C 2 H 4 + , C 2 H 5 + , C 2 H 4 O + , and C 2 H 4 F + are plotted as a function of α dose.…”
Section: Discussionmentioning
confidence: 97%
“…The major features of the data are represented in Figure by a simplified set of kinetic expressions that capture the observed reactants and functionalized fluorocarbon products. Reactions involving polyenes from radiolized isoparaffins are omitted because the radical scavenging of unsaturated hydrocarbons has been discussed elsewhere. We note at the outset that these expressions do not likely capture all possible kinetic pathways but are proposed as a means to address our data and engender discussion. Equation 1A indicates the initial cleavage of C−F bonds in the fluoropolymer resulting in fluorocarbon and F· radicals.…”
Section: Discussionmentioning
confidence: 99%