Heterocene-catalyzed ethylene/oct-1-ene copolymerization under MAO-free and low-MAO conditions: The synthesis of highly statistical copolymers and their use in blending with HDPE

Heterocene-catalyzed ethylene/oct-1-ene copolymerization under MAO-free and low-MAO conditions: The synthesis of highly statistical copolymers and their use in blending with HDPE Научная публикация

Журнал

Polymer
ISSN: 1873-2291 , E-ISSN: 0032-3861

Вых. Данные

Год: 2023, Том: 272, Номер статьи : 125836, Страниц : DOI: 10.1016/j.polymer.2023.125836

Авторы

Nifant'ev Ilya E. ^1,2 , Vinogradov Alexander A. ¹ , Vinogradov Alexey A. ¹ , Minyaev Mikhail E. ³ , Bagrov Vladimir V. ^1,2 , Salakhov Ildar I. ⁴ , Shaidullin Nadim M. ⁴ , Chalykh Anatoly E. ⁵ , Shapagin Alexey V. ⁵ , Ivchenko Pavel V. ^1,2

Организации

1	A. V. Topchiev Institute of Petrochemical Synthesis RAS, Leninsky pr. 29, Moscow, 119991, Russian Federation
2	Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory 1–3, Moscow, 119991, Russian Federation
3	N.D. Zelinsky Institute of Organic Chemistry RAS, Leninsky pr. 47, 119991, Moscow, Russian Federation
4	R&D Center PJSC Nizhnekamskneftekhim, Sobolekovskaya str. 23, 423574, Nizhnekamsk, Republic of Tatarstan, Russian Federation
5	Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskiy pr. 31, 119071, Moscow, Russian Federation

Sandwich SiMe2-bridged ansa-complexes of zirconium, containing heterocycle-fused η5-cyclopentadienyls, derivatives of 2,5-dimethyl-7H-cyclopenta[1,2-b:4,3-b']dithiophene (2), 5,10-dihydroindeno[1,2-b]indole (3) and 5,6-dihydroindeno[2,1-b]indole (4) – 'heterocenes' – catalyzed ethylene homopolymerization and ethylene/oct-1-ene (E/O) copolymerization in the presence of triisobutylaluminum (TIBA) without MAO and perfluoroaryl borate activators, the benchmark bis(η5-fluorenyl) complex 1 was virtually inactive under these conditions. In the absence of MAO, E/O copolymerization resulted in a formation of copolymers not containing EOOE fragments even at E/O ratio of 2.4. Addition of 10 eq. of MMAO-12 resulted in increase of both catalytic activities of 2–4 and oct-1-ene incorporation. E/O copolymers POE-05 (obtained on TIBA activated precatalyst 2) and POE-17 (obtained on TIBA/MMAO-12 activated precatalyst 4) were not inferior to the best commercial E/O copolymers in physico-mechanical characteristics at −45 °C. Extrusion blends of POE-05 and POE-17 with high density polyethylene (HDPE) demonstrated high impact strength and frost resistance.

Nifant'ev I.E. , Vinogradov A.A. , Vinogradov A.A. , Minyaev M.E. , Bagrov V.V. , Salakhov I.I. , Shaidullin N.M. , Chalykh A.E. , Shapagin A.V. , Ivchenko P.V.
Heterocene-catalyzed ethylene/oct-1-ene copolymerization under MAO-free and low-MAO conditions: The synthesis of highly statistical copolymers and their use in blending with HDPE
Polymer. 2023. V.272. 125836 . DOI: 10.1016/j.polymer.2023.125836 WOS Scopus OpenAlex

≡ Web of science:	WOS:000958399200001
≡ Scopus:	2-s2.0-85150367643
≡ OpenAlex:	W4324138159