Microstructure of isotactic polypropylene prepared with homogeneous catalysis: stereoregularity, regioregularity, and 1,3 insertion

13C NMR of polyolefins with a new high temperature 10mm cryoprobe

“…For example, the regioerrors can influence the polymeric properties as well as provide detailed insight into the mechanism of the polymerization catalyst. A few NMR studies of the related errors in polypropylene have been undertaken [3][4][5][6][7][8][9][10]. The studies were based mainly on additive 13 C chemical shift rules and model compounds.…”

Activation of iPr(CpFluo)ZrCl2 by methylaluminoxane, 3. Kinetic investigation of the syndiospecific hex-1-ene polymerization in hydrocarbon and chlorinated media

“…They do not depend on the initial monomer concentration as well as on the MAO/Zr ratio. This suggests that the polymer chain length is mainly controlled by a unimolecular transfer process, likely a b-H abstraction reaction 18,19) .…”

Copolymerization of Propene and Buta‐1,3‐diene in the Presence of Highly HinderedC2‐Symmetric Zirconocene‐Based Catalyst

“…A further primary insertion of propene would produce the symmetric substructure (G in Scheme 2) detectable in the spectra. [18] Conclusion Propene and butadiene copolymerize in the presence of a rac-[CH 2 (3-tert-butyl-1-indenyl) 2 ]ZrCl 2 -based catalytic Table 2. Chemical shifts of the main structures recognized in the 13 C NMR spectra of the propene-butadiene samples reported in Table 1 (HMDS was used as internal chemical shift reference).…”