However, the retained concentration was higher (97% w/w) when it is combined with 'S' (i.e. CS).
Table 3 shows the retained concentration of oligomeric HAS stabilizer in all samples after sterilization with 25 kGy.
In comparison, the retained concentration of Chimassorb-994 was higher in the LDPE matrix than that in iPP and EP matrices.
Time-dependent blocking and ripening retention were described using a Langmuir-type equation with a rate coefficient that respectively decreased and increased linearly with the retained concentration.
Upon implantation dose and average beam flux, the retained concentration of Fe implants ranges between 22 at.% and lower than 10 at.%.
Table 3 The retained concentration of oligomeric HALS (Chimassorb 994) after γ-sterilization (25 kGy) Components C CT CX CS CTX CTS CXS CTXS Chimassorb 994 (C), retained 80 43 71 97 na 92 87 na na not available.
However, the retained concentration of oligomeric HAS stabilizer was highly preserved whenever it combined with 'S' (i.e. CS, CTS and CXS), which is an indication of the synergistic effect.
The retained concentration of oligomeric HAS stabilizer (Chimassorb-994) in all mixtures which determined from the triazine absorption [41] will reveal the contribution of added stabilizers in polymer matrix.
This is because the phosphite stabilizers could destroy hydroperoxide and remove oxygen, thus protecting the Chimassorb-944, which may reflect why the retained concentration of oligomeric HAS (Chimassorb-994) in CS is higher (97% w/w) after γ-sterilization.
As the retained concentration of species 1 approached the maximum solid-phase concentration, a second mobile species (species 2, i.e., the same PVP-AgNPs that are reversibly retained) was released that could be retained at a different rate than species 1 and thus yielded the nonmonotonic RPs.
where R is the gas constant (8.314 J mol−1 K−1), K e is the equilibrium constant obtained from the Langmuir equation (C Ae /C e ) (where C Ae is the amount of Ni II) ions adsorbed at equilibrium (mg L−1) and C e is the retained concentration of each ions at equilibrium (mg L−1), and T is the absolute temperature (K): ln K e = ΔS R − ΔH R 1 T. Open image in new window (10).
