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Physicomechanical properties of polypropylene (PP) samples obtained on the MTCC1 and IKK8821 catalysts Parameter PP prepared on
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A comparative study of propylene polymerization in liquid monomer is performed under laboratory conditions using the IK-8-21 Ti-Mg catalyst designed at the Boreskov Institute of Catalysis and imported industrial catalysts (conditionally labeled TMC-1, -2, and -3). The activity and stereospecificity of the catalysts are estimated along with properti...
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... study of the physicomechanical properties of polypropylene samples obtained on the TMK1 and IKK8821 catalysts showed that at similar melt flow rates, PP samples synthesized on the IKK8821 catalyst were not inferior to those obtained on TMCC1 in terms of their physicomechanical characteristics (Table 3) Our studies showed that the IKK8821 Ti-Mg cataa lyst designed at the Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, is not inferior to its imported counterparts. The IKK8821 catalyst exhibits high activity and stereospecificity during propylene polymerization in liquid monomer. ...Citations
... IK-8-21 magnesium-titanium catalyst (MTC) was developed at the Boreskov Institute of Catalysis for the PP polymerization process [4,5]. A number of tests were performed with catalysts for the polymerization process in a liquid monomer and they showed that IK-8-21 catalyst is not inferior to its foreign analogues in terms of activity and the quality of the resulting PP [6]. ...
The effect of the particle size of an IK-8-21 domestic titanium-magnesium catalyst on the properties of polypropylene (PP) produced during the polymerization of propylene in a liquid monomer is studied. Catalysts with particle sizes of 20 to 64 μm are shown to have high activity and identical sensitivity to hydrogen and allow PP to be obtained with a narrow distribution of particles over size, high isotacticity, and close values of crystallinity, melting temperature, and physicomechanical properties. A slight decrease in the activity and bulk density of PP powder is observed when the average size of catalyst particles is increased from 20 to 43 μm. A more notable reduction in the activity and bulk density of PP powder is observed for catalyst with particle sizes of 62 to 64 μm. IK-8-21 catalyst is not inferior to its foreign analogues with respect to the properties of the resulting PP.
The effect of polymerization conditions (temperature, polymerization time, monomer and hydrogen concentrations) on propylene polymerization in the liquid monomer in the presence of a TiCl4/DBP/MgCl2 + TEA/cyclohexylmethyldimethoxysilane catalyst system is studied . It is shown that the variation of the propylene polymerization conditions in the studied ranges leads to a change in the characteristics of the resulting polypropylene. The kinetic parameters of propylene polymerization in the liquid monomer for the studied catalyst system are determined. Polymerization conditions providing the formation of polypropylene with high polymer yield, isotacticity, and bulk density values are found. The process parameters that make it possible to effectively control the molecular and rheological characteristics of polypropylene are identified.
Two new ethers were synthesized using the Williamson reaction from related alcohols and were used as external donors in propylene polymerization in the presence of the industrial diisobutyl phthalate-based MgCl2-supported Ziegler-Natta catalyst. For comparison the propylene polymerization was carried out in the presence of silane and in the absence of external donors. The produced polymers were characterized by differential scanning calorimetry, xylene extraction, melt flow index, scanning electron microscopy and gel permeation chromatography. The isotacticity, molecular weight and molecular weight distribution, melt flow index, crystallinity degree and thermal properties of polypropylenes were influenced by the type of external donors.
