4 years ago

Neodymium Catalyst for the Polymerization of Dienes and Polar Vinyl Monomers

Neodymium Catalyst for the Polymerization of Dienes and Polar Vinyl Monomers
Mihaela C. Stefan, Hien Q. Nguyen, Gregory T. McCandless, Annie Yang, Ruvanthi N. Kularatne
Ziegler–Natta catalysts have played a major role in industry for the polymerization of dienes and vinyl monomers. However, due to the deactivation of the catalyst, this system fails to polymerize polar vinyl monomers such as vinyl acetate, methyl methacrylate, and methyl acrylate. Herein, a catalytic system composed of NdCl3⋅3TEP/TIBA is reported, which promotes a quasi-living polymerization of dienes and is also active for the homopolymerization of polar vinyl monomers. Additionally, this catalytic system generates polymyrcene-b-polyisoprene and poly(myrcene)-b-poly(methyl methacrylate) diblock copolymers by sequential monomer addition. To encourage the replacement of petroleum-based polymers by environmentally benign biobased polymers, polymerization of β-myrcene is demonstrated with a catalytic activity of ≈106 kg polymer mol Nd−1 h−1. Ziegler–Natta (ZN) catalysts are being used for the polymerization of dienes; however, their inability to polymerize polar vinyl monomers limits the further application of the catalyst in the industry. The NdCl3·3TEP/TIBA catalytic system reported herein provides an alternative to the ZN system, which is active for the polymerization of dienes and for polar vinyl monomers.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/marc.201700427

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