论文信息 - The influence of the nature of organoaluminum compound on kinetic heterogeneity of active sites in lanthanide‐based diene polymerization

The influence of the nature of organoaluminum compound on kinetic heterogeneity of active sites in lanthanide‐based diene polymerization

The influence of organoaluminum compound on kinetic heterogeneity of active sites in lanthanide-based diene polymerization was investigated. It was shown that heterogeneity of investigated catalytic systems was displayed in the existence of four types of active centers. They are formed at the beginning of the polymerization process and produce macromolecules with lengths that are definite for each type of active centers. The organoaluminum compound's nature greatly influences the kinetic activity of polymerization centers. The method of analysis of the curves' maximum distribution on kinetic activity and the change of kinetic activity of every active centers' type were proposed, which permits the calculation of values of concentration for each type of active center separately. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 358–368, 2003

[1] A. Tikhonov,et al. Numerical Methods for the Solution of Ill-Posed Problems , 1995 .

[2] V. G. Kozlov,et al. The effect of the nature of organoaluminium compound and the catalytic system preparation procedure on molecular characteristics of 1,4‐Cis‐polybutadiene , 1994 .

[3] V. G. Kozlov,et al. Diene polymerizations with lanthanide coordination catalysts. II. The effects of catalytic system component types and polymerization conditions on molecular characteristics of 1,4-cis-Polybutadienes , 1988 .

[4] G. Tolstikov,et al. Diene polymerizations with the lanthanide coordination catalysts. I. Piperylene polymerizations effected by the type of lanthanide , 1988 .

[5] H. Hsieh,et al. Polymerization of Butadiene and Isoprene with Lanthanide Catalysts; Characterization and Properties of Homopolymers and Copolymers , 1985 .

[6] J. R. Street,et al. Polymerization in catalyst particles: Calculation of molecular weight distribution , 1972 .

[7] H. Benoit,et al. A universal calibration for gel permeation chromatography , 1967 .

[8] A. Yagola. On the choice of regularization parameter when solving ill-posed problems in reflexive spaces☆ , 1980 .