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Synthesis and Properties of Ethylene/Propylene and Ethylene/Propylene/5-Ethylidene-2-norbornene Copolymers Obtained on Rac-Et(2-MeInd)2ZrMe2/Isobutylaluminium Aryloxide Catalytic Systemsстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Faingol’d Evgeny E., Saratovskikh Stanislav L., Panin Andrei N., Babkina Olga N., Zharkov Igor V., Kapasharov Artur T., Bubnova Maria L., Shilov Gennady V., Bravaya Natalia M.
- Журнал: Polymers
- Том: 15
- Номер: 3
- Год издания: 2023
- Издательство: MDPI
- Местоположение издательства: Basel, Switzerland
- Первая страница: 487
- DOI: 10.3390/polym15030487
- Аннотация: Abstract: Ethylene/propylene (E/P) and ethylene/propylene/5-ethylidene-2-norbornene (E/P/ENB) copolymers were obtained on rac-Et(2-MeInd)2ZrMe2 activated by a number of iso-butylaluminium aryloxides: (2,6-tBu2PhO-)AliBu2 (1-DTBP) (2,6-tBu2,4-Me-PhO-)AliBu2 (1-BHT), (2,4,6-tBu2PhO-)AliBu2 (1-TTBP), (2,6-tBu2,4-Me-PhO-)2AliBu (2-BHT), (2,6-tBu2PhO-)2AliBu (2-DTBP), [(2-Me,6-tBu-C6H3O)AliBu2]2 (1-MTBP), [(2,6-Ph2-PhO)AliBu2]2 (1-DPP). The study shows how the structure of activator influences catalytic activity and polymer properties, such as copolymer composition, molecular weight characteristics, thermophysical and mechanical properties. It has been shown that both the introduction of a bulky substituent in the para-position of the aryloxy group and the additional aryloxy group in the structure of activator lead to a significant decrease in activity of the catalytic system in all studied copolymerization processes. Moreover, activation by bulkier aryloxides leads to lower level of comonomer insertion and gives rise to higher molecular weight polymers. Broad or multiple endothermic peaks with different values of melting points are observed on DSC curves of copolymers obtained with different catalytic systems. DSC of thermally fractionated samples makes it possible to reveal heterogeneity of the copolymer microstructure, which manifests itself in the presence of a set of lamellar crystallites of different thickness. The results also present the mechanical properties of copolymers, such as tensile strength (σ), elongation at break (ε), and engineering strain (EL). The synthesized E/P and E/P/ENB copolymers contain about 1-4 wt. % of sterically hindered phenols obtained in situ as a residue of hydrolyzed activators in the course of reaction quenching. This determines increased thermooxidative stability of the copolymers.
- Добавил в систему: Файнгольд Евгений Ефимович