By Abdulakh K. Mikitaev, Mukhed Kh Ligidov, Gennady E. Zaikov
This quantity comprises the next analyses: elements relating to thermal and thermooxidative degradation of polyolefine nanocomposites, modelling of catalytic complexes within the oxidation reactions, modelling the kinetics of moisture absorption via common and artificial polymers, new tendencies, achievements and advancements at the results of beam radiation, structural behaviour of composite fabrics, comparative overview of antioxidant houses, synthesis, houses 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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Sample text
Hence, such rearrangements can be expected to occur also in PE-n-MMT. Acids can decompose primary and secondary hydroperoxides according to two different pathways [34]. Both these routes are depicted in Scheme 4 for the secondary hydroperoxides most probably present in PE. Since mobility of the methylene units in the PE backbone is rather limited, it is reasonable to assume that reaction (2) in Scheme 4 should be of minor importance. Then the main reaction [reaction (1) in Scheme 4] must lead to transformation of the hydroperoxide into the ketone group with elimination of water.
The conditions w0~[Cat]1/2 and wi0~[Cat] are supposed to be fulfill also in the presence of R4NBr additives. The values of wi0 (O2 activation) and wpr0 (Cat + RO2•→) were estimated [22]. The chain initiation in the ethylbenzene oxidation with dioxygen in the presence of Fe(III)(acac)3 or {Fe(III)(acac)3+ R4NBr} can be represented by the following reaction [13,22]: Fe(III)(acac)3 ((Fe(III)(acac)2)m·(R4NBr)n)+ RH → → Fe(II)(acac)2 ((Fe(II)(acac)2)x·(R4NBr)y) … Hacac + R• (I) The reaction (I) and interaction of the resulting Fe(II) complex with dioxygen appear to be responsible for chain initiation in the ethylbenzene oxidation, catalyzed by Fe(III)(acac)3 or {Fe(III)(acac)3+ + R4NBr}.
Sci. C. 1965. 6. № 1. 175. [25] Bockhorn H, A. Hornung A, Hornung U, Schawaller D. Journal of Analytical and Applied Pyrolysis. 1999. 48. 2. 93. [26] N. Grassie, Gerald S. Polymer Degradation and Stabilization, Cambridge University Press, Cambridge - New York – Melbourne – Sydney, 1988, 222 p. [27] Gugumus F. Polym Degrad Stab 2000; 69:23–34. [28] Lacoste L, Carlsson DJ. Gamma-, photo-, and thermally-initiated oxidation of linear low density polyethyleneda quantitative comparison of oxidation products.