Determination of the distribution function of kinetic activity in catalytic systems

Kinetic Heterogeneity and Distribution of the Active Sites of the TiCl4-Al(i-C4H9)3 Catalytic System by Stereoregulating Ability in Butadiene Polymerization

“…A three-column system packed with styrogel was calibrated against polystyrene standards with a narrow MWD ( M w / M n ≤ 1.2 ) using the universal Benoit dependence and an equation relating the MW of 1,4-trans -polybutadiene to the intrinsic viscosity [10]. The MWD curves were corrected with application of the instrument broadening correction as described previously [11].The polymer was fractionated by fractional precipitation with methanol from a 1% toluene solution followed by reprecipitation.The kinetic heterogeneity of the catalytic system was estimated by solving the inverse problem of MWD formation by the Tikhonov regularization method [3][4][5][12][13][14].In all cases, the polymers had bimodal molecular weight distributions considerably extending toward lower molecular weights (for example, Fig. 1, curve 1 ).…”

“…The kinetic heterogeneity of the catalytic system was estimated by solving the inverse problem of MWD formation by the Tikhonov regularization method [3][4][5][12][13][14].…”