Impact of the method of Mg2+ cation introducing into the titanium post-metallocene catalytic system on their activity

Impact of the method of Mg2+ cation introducing into the titanium post-metallocene catalytic system on their activity Full article

Journal

Polymer Bulletin
ISSN: 1436-2449

Output data

Year: 2025, Volume: 82, Number: 4, Pages: 1131-1147 Pages count : 17 DOI: 10.1007/s00289-024-05558-6

Authors

Tuskaev Vladislav A. ^1,2 , Kurmaev Dmitry A. ² , Gagieva Svetlana Ch. ² , Golubev Evgenii K. ^3,4 , Buzin Mikhail I. ¹ , Khrustalev Victor N. ^5,6 , Aksenova-Soloveva Svetlana A. ¹ , Gracheva Alexandra V. ² , Bulychev Boris M. ²

Affiliations

1	A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova St. 28, Moscow, Russian Federation, 119334
2	Department of Chemistry, M. V. Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, Russian Federation, 119992
3	Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, Profsoyuznaya Str., 70, Moscow, Russian Federation, 117393
4	N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 4 Kosygin St., Moscow, Russian Federation, 119991
5	N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect, 47, Moscow, Russian Federation
6	Peoples' Friendship University of Russia (RUDN University), Moscow, Russian Federation

This work shows for the first time the influence of the method of introducing Mg compounds into a post-metallocene-type catalytic system on its catalytical performance and the properties of the resulting polymer, and it is concluded that the real catalytic center is heterometallic Ti/Mg complexes. Three different approaches were compared to introducing Mg compounds into catalytic systems containing a titanium(IV) dichloride complex with an (O^O)2− type ligand and an organoaluminium compound—the use of Al/Mg co-catalysts, the immobilization of a Ti complex on the surface of anhydrous MgCl2 and in situ preparation of heterometallic Ti/Mg complexes. All three approaches lead to the production of ultra-high molecular weight polyethylene, but systems with externally introduced magnesium chloride showed the lowest productivity. On the contrary, heterometallic Ti/Mg precatalysts are successfully activated by conventional organoaluminium compounds (Et3Al, iBu3Al, MAO) and are superior to the reference catalytic system both in activity and in polymer molecular weights. Their use makes it possible to reduce the Ti/Mg molar ratio in catalytic systems from 1:300 to 1:1–2. The resulting UHMWPE samples are suitable for solvent-free solid-phase processing into high-strength, high-modulus film threads.

Tuskaev V.A. , Kurmaev D.A. , Gagieva S.C. , Golubev E.K. , Buzin M.I. , Khrustalev V.N. , Aksenova-Soloveva S.A. , Gracheva A.V. , Bulychev B.M.
Impact of the method of Mg2+ cation introducing into the titanium post-metallocene catalytic system on their activity
Polymer Bulletin. 2025. V.82. N4. P.1131-1147. DOI: 10.1007/s00289-024-05558-6 WOS OpenAlex

Web of science:	WOS:001354661100001
OpenAlex:	W4404352593

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