Didecyl sulfide

C17H36S ethyl pentadecyl sulfide 64919-20-6 2.579E+10 191.590 32539 C20H42S didecyl sulfide 693-83-4 2.984E+10 222.280... 

Fig. 22. Dependence of the induction period in the oxidation of polypropylene on the didecyl sulfide concentration (3). 1) The same in the presence of 0,04 mole/kg, 2,6 -di -tert -octyl -4 -methyl -phenol 2) the same in the presence of 0.08 mole/kg 2,6-di-tert-octyl-4-meth-ylphenol. T = 200 C Pq = 300 mm Hg.

Fig. 24. Consumption of di-tert-butyl-p-cresylmethane in the oxidation of polypropylene (1) and in the presence of didecyl sulfide J2). T = 200 C Pq = 300 mm Hg.

If the antioxidant 2,6-di-tert-octyl-4-methylphenol is introduced into polypropylene in various concentrations, then at 200°C and pQ =300mmI the induction period increases linearly from 8 to 65 min, i. e., no critical antioxidant concentration is observed. If, in addition to the indicated phenol, didecyl sulfide is introduced into the polymer, a critical concentration will be distinctly observed, and will decrease with increasing sulfide concentration, in accord with the formula of [34] (Fig. 21). 

Didecyl sulfide itself is a relatively ineffective antioxidant, and its introduction into polypropylene produces an extremely slight increase in the induction period. However, the introduction of 2,6-di-tert-octyl-4-... 

Experiments have shown that the introduction of didecyl sulfide into polypropylene sharply reduces the rate of consumption of 2,6-di-tert-octyl-4-methylphenol (Fig. 23). The rate of consumption of the antioxidant di-tert-buiyl-p-cresylmethane in polypropylene is analogously reduced, but to a lesser degree, if didecyl sulfide is introduced into the polymer, as can be seen from the curves presented in Fig. 24. These facts are in full agreement with the theory developed in... 

It is precisely by decomposition of the hydroperoxide and deceleration of the antioxidant consumption that the effect of mutual intensification of the effectiveness, observed in mixtures of 2,6-di-tert-octyl-4-methylphenol with didecyl sulfide is explained. Each of these inhibitors of oxidation, taken individually, only negligibly lengthens the induction period. In a mixture, on the other hand, they are capable of lengtheniag the induction period in the oxidation of polypropylene to 450 min at 200°C and an oxygen pressure of 300 mm Hg (Fig. 25). 

Monolayers of the cavitand 8a have been successfully used for the detection of small neutral organic molecules. Therefore, gold electrodes of a quartz microbalance oscillator were covered with monolayers of 8a and this device was exposed to ppm concentrations of perchloroethylene and other small organic molecules (chloroform, trichloroethylene, and toluene) in synthetic air. Fast, reversible, and relatively large shifts in the fundamental oscillation frequency are observed with remarkable selectivity (> 7-25) for perchloroethylene. In contrast, monolayers of didecyl sulfide exhibit almost no detectable signal. These results indicate that perchloroethylene molecules incorporate into the molecular cavities of the cavitand monolayers. Further studies of these supramolecular assemblies with surface recognition sites are in progress. 

Didecyl sulfate, D-00108 Didodecylaminc, D-OOl 09 Didodecyl hydrogen phosphate, D-OOl 10 Didodecyl sulfate, D-OOl 11 Didodecyl sulfide, D-OOl 12... 

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