Assessing 1,9-Decadiene/Propylene Copolymerization with Ziegler-Natta Catalysts to Long-Chain-Branched Polypropylene

1,9-Decadiene/propylene copolymerization is assessed as a way for Ziegler-Natta catalysts to access long-chain-branched polypropylene (LCB-PP). A MgCl2/9,9-bis-(methoxymethyl)­fluorine/TiCl4 catalyst with triethylaluminum as a cocatalyst, which is celebrated as a higher α-olefin-capable Ziegler-Natt...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2020-07, Vol.59 (26), p.12038-12047
Main Authors: Liu, Yang, Qin, Yawei, Dong, Jin-Yong
Format: Article
Language:English
Subjects:
Kinetics, Catalysis, and Reaction Engineering
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Summary:1,9-Decadiene/propylene copolymerization is assessed as a way for Ziegler-Natta catalysts to access long-chain-branched polypropylene (LCB-PP). A MgCl2/9,9-bis-(methoxymethyl)­fluorine/TiCl4 catalyst with triethylaluminum as a cocatalyst, which is celebrated as a higher α-olefin-capable Ziegler-Natta catalyst system, is exemplified for the task. It is found that the catalyst system incorporates 1,9-decadiene forming LCB structures only at greatly increased 1,9-decadiene concentrations. The LCB structure formation lags much behind 1,9-decadiene incorporation, leaving a narrow window to access gel-free LCB-PP. Rheological properties of the copolymers are well correspondent with their structures. The gel-free LCB sample exhibits the characteristic rheological behavior of LCB-PP including increased elasticity (G′) and enhanced shear thinning. Because of the low LCB efficiency for 1,9-decadiene, the copolymers are substantially reduced in melting temperature (T m) due to the redundant vinyl structures acting as short-chain branching.
ISSN:0888-5885
1520-5045
DOI:10.1021/acs.iecr.0c02087