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- W2023873875 abstract "It was shown that in the range of gravimetric ratios of 1<monomer:catalyst<20 the systems examined consist of free macromolecules and polymer-catalyst particles of different structures. Macromolecular extension only takes place on the surface of catalyst particles, the stage of homogeneous polymerization being practically absent. Structural parameters of polymer-catalyst particles were determined approximately: their molecular weight, dimensions of nuclei (i.e. solid phase of the catalyst) and the solid phase content of the catalyst inside polymer-catalyst particles. Minimum dimensions of the nucleus in small polymer-catalyst particles are ∼40 Å, however, with considerable conversion of the monomer a large part of the polymer is evidently formed on the surface of particles with a dimension of 500–800 Å. The content of small polymer-catalyst particles in “live” systems correlates with the initial activity of catalytic systems. Differences were noted in the molecular weight value of macromolecules formed on large and small catalyst particles." @default.
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- W2023873875 date "1980-01-01" @default.
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- W2023873875 title "Molecular composition of “live” systems formed during polymerization of isoprene by the action of a TiCl4+Al(isoC4H9)3 colloidally dispersed catalyst" @default.
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- W2023873875 doi "https://doi.org/10.1016/0032-3950(80)90100-8" @default.
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