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
Научная публикация
| Общая информация |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Macromolecular Chemistry and Physics
ISSN: 1022-1352
, E-ISSN: 1521-3935
|
| Вых. Данные |
Год: 2018,
Том: 219,
Номер: 5,
Номер статьи
: 1700488,
Страниц
: 9
DOI:
10.1002/macp.201700488
|
| Ключевые слова |
Fractionation of polymers, Molecular weight distribution/molar mass distribution, Poly(propylene) (PP), Ziegler-Natta polymerization |
| Авторы |
Nikolaeva Marina
1
,
Matsko Mikhail
1
,
Zakharov Vladimir
1,2
|
| Организации |
| 1 |
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
|
| 2 |
The Department of Natural Sciences, Novosibirsk State University, Novosibirsk, Russia
|
|
Информация о финансировании (2)
|
1
|
Министерство образования и науки Российской Федерации
|
|
|
2
|
Федеральное агентство научных организаций России
|
0303-2016-0009
|
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.