Abstract
A mathematical model of the process of producing polyisoprene in the presence of various catalytic systems of the Ziegler-Natta type is constructed in the article. When developing a ...mathematical model, the polycentric nature of the applied catalytic system was taken into account and the modular construction principle was applied, which allows calculations to be made both for the batch mode of the process and for the continuous mode. An analysis was also made of the influence of the hydrodynamic regime on the polymerization rate and the molecular characteristics of the resulting product using the example of a titanium-containing catalyst system.
Abstract
The article describes an algorithm for modeling the isoprene polymerization process based on the Monte Carlo method. The algorithm can be used to simulate polymerization processes carried ...out in batch or continuous mode. The possible polycentricity of the catalyst used is also taken into account. The model is based on this algorithm makes it possible to study the properties of the polymerization product and calculate the molecular weight distribution for different points in time.
The results of studying the kinetics of the polyisoprene synthesis in the presence of neodymium-containing catalytic systems under conditions of preliminary hydrodynamic action at the stage of ...preparation of the catalytic complex are reported. Mathematical research methods allow expansion of the results of laboratory studies to the scale of continuous industrial production and evaluating the effect of dosages of triisobutylaluminum and diisobutylaluminum hydride on the molecular characteristics of the resulting product. The essential role of triisobutylaluminum, which is initially present in the composition of the catalytic complex, has been demonstrated in the mechanism of limiting the growth of polymer chains.
The kinetic heterogeneity of the gadolinium-based catalytic system in 1,4-
cis
-polyisoprene synthesis was studied. The final form of the active site distribution function at preset accuracy was ...obtained by setting and solving the inverse problem of the molecular-mass distribution formation using the Tikhonov’s regularization method and numerical calculation methods. The results obtained show that there are at least three types of active sites with different kinetic activity in the system.
Herein, we present a synthesis of a molecular construct based on the polysulfonated indocarbocyanine dye and the lysine. The chemical structure of the construct obtained enables fluorescent labeling ...of oligonucleotide probes designed for the immobilization on the oligonucleotide biochips.
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