Modern Tendencies in Organic and Bioorganic Chemistry - by Abdulakh K. Mikitaev, Mukhed Kh Ligidov, Gennady E. Zaikov

By Abdulakh K. Mikitaev, Mukhed Kh Ligidov, Gennady E. Zaikov

This quantity contains the next analyses: elements concerning thermal and thermooxidative degradation of polyolefine nanocomposites, modelling of catalytic complexes within the oxidation reactions, modelling the kinetics of moisture absorption by way of traditional and artificial polymers, new developments, achievements and advancements at the results of beam radiation, structural behaviour of composite fabrics, comparative evaluate of antioxidant homes, synthesis, homes and alertness of polymeric composites and nanocomposites, photodegradation and light-weight stabilisation of polymers, put on resistant composite polymeric fabrics, a few macrokinetic phenomena, delivery phenomena in polymer matrixes, liquid crystals, flammability of polymeric fabrics and new flame retardants.

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At this stage, the lower activation energy of PE-n-MMT compared to that of PE may be related to the catalysis exerted by the ММТ during formation and decomposition of hydroperoxides. At the same time, the values of activation energy found at the second and the third stages of thermal-oxidative degradation for PE-n-MMT are higher than those for PE (Table 3, Figure 14). This difference may be attributed to a shift of the PE-n-MMT degradation process to a diffusion-limited mode owing to emergence in the system of a carbonized cross-linked material.

The homogeneity of the hydrocarbon solution remains upon addition of small amounts H2O ([H2O] ∼ 10-3 моль/л) [20]. 2. EXPERIMENTAL Ethylbenzene (RH) oxidation was studied at 80°C in glass bubbling-type reactor in the presence of Fe(III)(acac)3(5·10--3 mol/l) and additives of R4NBr(5·10-4 mol/l) (R4NBr = (С2H5)4NBr, Me4NBr, CTAB). The selectivity SPEH and RH conversion degree C of ethylbenzene into PEH oxidation were determined using the formulas: SPEH = [PEH] / Δ[RH]·100% and C = Δ[RH] / [RH]0·100%.

The relatively low efficiency of Fe(III)(acac)3 and {Fe(III)(acac)3+L2} systems (as a selective catalysts for ethylbenzene oxidation to PEH) as compared to the efficiency of Ni(II) complexes is due to the simultaneous formation of PEH, methylphenylcarbinol (MPC), acetophenone (AP) and the high rates of accumulation of MPC and AP as the principle products. We established that mechanism of the formation of the selective nickel(II) catalyst responsible for the rise in the selectivity SREH in the process of the ethylbenzene oxidation, consisted in the oxygenation of Ni(II)(L1)2·(L2)n complexes with molecular O2.

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