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Olefin Polymerization Behavior of Titanium(IV) complexes with fluorinated and non-fluorinated aliphatic phenoxyimine ligandsстатья
- Авторы: Tuskaev Vladislav A., Magomedov Kasim F., Gagieva Svetlana Ch, Kurmaev Dmitry A., Nelyubina Yulia V., Golubev Evgenii K., Evseeva Maria D., Vasil'ev Viktor G., Nikiforova Galina G., Buzin Mikhail I., Bogdanov Vyacheslav S., Bulychev Boris M.
- Журнал: Chinese Journal of Polymer Science (English Edition)
- Том: 41
- Год издания: 2023
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Номер статьи: cjps-2023-0229
- DOI: 10.1007/s10118-023-3032-1
- Аннотация: A series of Ti(IV) dichloride and dialkoxide complexes with phenoxyimine ligandscontaining fluorinated and nonfluorinated aliphatic imine fragments have been synthesized. Themolecular structures of complexes 1 and 4 were established by single-crystal X-ray diffractionstudies. The complexes adopt a distorted octahedral coordination structure around the titaniumatom and two oxygen atoms are situated in trans position while two nitrogen atoms and twooutgoing ligands (Cl or iPrO) are situated in cis position. Effect of activators (MMAO-12 andcombinations EtnAlCl3-n + Bu2Mg) and outgoing ligand (Cl or iPrO) nature on the catalyticactivity and properties of the resulting polymers was studied. The Ti complexes, despite the natureof the outgoing ligands (Cl or iPrO) in the presence of Al/Mg activators, was found to display ahigh ethylene polymerization activity in the range 1600-3830 kg of polymer/molTi ·h·atm with aviscosity average molecular weight (Mv) value in the range 1.1-7.1·106 Dalton (Da). The resultingUHMWPE can be processed by a solventless method into high-strength and high-modulusoriented films. The rheological characteristics of a polymer melt have been studied. The absenceof a cross-over point did not allow to compare the values of the molecular weight distribution ofpolymers obtained on fluorinated and non-fluorinated pre-catalysts, however, the estimation of the entanglement density is in good agreement with the mechanical characteristics of oriented films.Upon activation with methylalumoxane, the activity of the complexes decreased very significantly;however, a polymer with a molecular weight of about 12 million Da was obtained. In the processof ethylene/octene-1 copolymerization, fluorine-containing precatalysts showed a clear advantageover non-fluorinated analogues both in activity and in comonomer content.
- Добавил в систему: Гагиева Светлана Черменовна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | kasim_2.pdf | 1,6 МБ | 18 сентября 2023 [GagievaSvetlana1] | |
| 3. | акт экспертизы | 1690006176780.jpg | 3,2 МБ | 22 июля 2023 [GagievaSvetlana1] |