2‑Methoxyethylamino-bis(phenolate)yttrium Catalysts
for the Synthesis of Highly Isotactic Poly(2-vinylpyridine) by Rare-Earth
Metal-Mediated Group Transfer Polymerization
Version 2 2016-09-07, 13:19
Version 1 2016-08-26, 20:18
Posted on 2016-08-29 - 00:00
Highly isotactic poly(2-vinylpyridine)
(P2VP) was synthesized by
the group transfer polymerization of the prochiral 2-vinylpyridine
(2VP) with 2-methoxyethylaminobis(phenolate)yttrium complexes.
Isotacticities of up to Pm =
0.92, narrow molecular weight
distributions, and high molecular weights were achieved by steric
modifications of the variable bisphenolate ligand structure. The resulting
polymer samples were characterized by thermoanalysis (DSC, TGA), GPC,
and 13C NMR. The origin of the isotactic microstructure
was attributed to an enantiomorphic site control mechanism based on 13C NMR mechanistic studies and allowed new insights into 13C pentad assignments.
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Kronast, Alexander; Reiter, Dominik; Altenbuchner, Peter T.; Vagin, Sergei I.; Rieger, Bernhard (2016). 2‑Methoxyethylamino-bis(phenolate)yttrium Catalysts
for the Synthesis of Highly Isotactic Poly(2-vinylpyridine) by Rare-Earth
Metal-Mediated Group Transfer Polymerization. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.6b01179
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AUTHORS (5)
AK
Alexander Kronast
DR
Dominik Reiter
PA
Peter T. Altenbuchner
SV
Sergei I. Vagin
BR
Bernhard Rieger
KEYWORDS
originvinylpyridineprochiralthermoanalysimethoxyethylaminoP m13 C pentad assignmentsweight distributionssteric modificationsenantiomorphic site control mechanism13 C NMRDSCcomplexCatalyst2-insightTGAGPCIsotacticRare-Earth Metal-Mediated Group Transfer Polymerizationbisphenolate ligand structureIsotacticitiegroup transfer polymerizationP 2VPMethoxyethylamino-bipolymer samplesSynthesiisotactic microstructure