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Covalent Organic Framework-Supported Metallocene for Ethylene Polymerization
Ist Teil von
Chemistry : a European journal, 2023-09, Vol.29 (54), p.e202300913-e202300913
Ort / Verlag
Germany: Wiley Subscription Services, Inc
Erscheinungsjahr
2023
Link zum Volltext
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
The loading of homogeneous catalysts with support can dramatically improve their performance in olefin polymerization. However, the challenge lies in the development of supported catalysts with well-defined pore structures and good compatibility to achieve high catalytic activity and product performance. Herein, we report the use of an emergent class of porous material-covalent organic framework material (COF) as a carrier to support metallocene catalyst-Cp
ZrCl
for ethylene polymerization. The COF-supported catalyst demonstrates a higher catalytic activity of 31.1×10
g mol
h
at 140 °C, compared with 11.2×10
g mol
h
for the homogenous one. The resulting polyethylene (PE) products possess higher weight-average molecular weight (M
) and narrower molecular weight distribution (Ð) after COF supporting, that is, M
increases from 160 to 308 kDa and Ð drops from 3.3 to 2.2. The melting point (T
) is also increased by up to 5.2 °C. Moreover, the PE product possesses a characteristic filamentous microstructure and demonstrates an increased tensile strength from 19.0 to 30.7 MPa and elongation at break from 350 to 1400 % after catalyst loading. We believe that the use of COF carriers will facilitate the future development of supported catalysts for highly efficient olefin polymerization and high-performance polyolefins.