Comparative Study of Distribution of Active Sites According to Their Stereospecificity in Propylene Polymerization over the Traditional TiCl3 and Supported Titanium–Magnesium Catalysts with Different Composition

Marina Nikolaeva, Mikhail Matsko, Vladimir Zakharov

Результат исследования: Научные публикации в периодических изданияхстатья

1 Цитирования (Scopus)

Аннотация

The preparative-temperature rising elution fractionation method is used to obtain comparative data on contents of fractions with different microtacticities for polypropylene (PP) samples prepared using three catalytic systems: the traditional Ziegler–Natta (Z–N) catalyst δ-TiCl3 and two types of supported titanium–magnesium catalysts: the “donor-free” TiCl4/MgCl2 catalyst and TiCl4/MgCl2·nDBP catalyst (DBP – dibutylphthalate used as an internal donor) at polymerization with the same cocatalyst (AlEt3) in the absence and presence of an external donor (propyltrimetoxy silane). The separated individual PP fractions are also studied by gel permeation chromatography (molecular weight and molecular weight distribution) and differential scanning calorimetry. The results demonstrate general regularities and differences in the formation of active sites having different isospecificities for the traditional TiCl3-based Z–N catalyst and highly active supported titanium–magnesium catalysts.

Язык оригиналаанглийский
Номер статьи1700488
Число страниц9
ЖурналMacromolecular Chemistry and Physics
Том219
Номер выпуска5
DOI
СостояниеОпубликовано - 1 мар 2018

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