Ethylene polymerization initiator consumption

The first kinetic studies were made by Hay and coworkers l71,l72). They found that the rate of polymerization of ethylene was independent of the concentration of TMEDA and concluded that the active initiating species is n-butyllithium which is neither complexed nor self-associated initiator efficiences were reported to be less than 50 %. The rate of consumption of ethylene was found to be proportional to the concentrations of ethylene and n-butyllithium. 

Preparation and introduction into polymerizer of catalytic complex components in tubular turbulent pre-reactor (Fig. 6.4) provides production of copolymer (SKEP and SKEPT) with good and stable in time properties (Table 6,2). Analogously to laboratory results received under separation of stage of formation of active sites and initiation of isoprene polymerization on Ti-Al catalytic system (see 5.3.1) at conditions of industrial production under ethylene of propylene copolymerization increase of copolymer yield and its molecular mass and also decrease of catalyst consumption are observed. 

There was no induction period in the solution polymerization of vinyl chloride [52] initiated by the benzoyl peroxide-dimethylaniline system in various solvents such as tetrahydrofuran, ethylene dichloride, dioxane, cyclohexanone, methylethyl ketone, and so forth. The initial rate of polymerization and the conversion was directly and inversely proportional to the temperature, respectively. The polymerization was restricted to only 20% conversion, probably due to the complete consumption of benzoyl peroxide. Without the monomer, the extent of decomposition on benzoyl peroxide reaches a constant value regardless of the temperature and amount of di-methylaniline. It was seen that the greater the amount of dimethylaniline, the faster the initial rate of polymerization and the lower the conversion. The degree of polymerization of vinyl chloride obtained by the redox system benzoyl peroxide-dimethylaniline was generally lower than the polymer obtained by the benzoyl peroxide system alone. The activation energy of the polymerization by the redox system was lower than that of the benzoyl peroxide alone initiated polymerization and found to be 12.5 kcal mol The initial rate of polymerization could be expressed as... 

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