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Regio- and Stereoselective Polymerization of Bio-based Ocimene by Rare-Earth Metal Catalysts.
- Source :
-
Chinese Journal of Polymer Science (Springer Science & Business Media B.V.) . Feb2024, Vol. 42 Issue 2, p223-229. 7p. - Publication Year :
- 2024
-
Abstract
- Coordination polymerization of renewable β-ocimene has been investigated using asymmetric diiminophosphinate lutetium complex 1, β-diketiminate yttrium complex 2, bis(phosphino)carbazolide yttrium complex 3, half-sandwich benzyl fluorenyl scandium complex 4 and pyridyl-methylene-fluorenyl rare-metal complexes 5a–5c. Complexes 1, 4 and 5a–5c show trans-1,2-regioselectivities and high activities, of which 5c exhibits excellent isoselectivity (mmmm>99%). Conversely, complexes 2 and 3 promote β-ocimene polymerization to produce isotactic cis-1,4-polyocimenes (cis-1,4>99%, mm>95%). Diblock copolymers cis-1,4-PIP-block-cis-1,4-POc and cis-1,4-PBD-block-cis-1,4-POc are obtained in one-pot reactions of β-ocimene with isoprene and butadiene using complex 3. Epoxidation and hydroxylation of polyocimene afford functionalized polyolefins with enhanced Tg (from −20 °C to 79 °C and 74 °C) and hydrophilicity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02567679
- Volume :
- 42
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Chinese Journal of Polymer Science (Springer Science & Business Media B.V.)
- Publication Type :
- Academic Journal
- Accession number :
- 175021643
- Full Text :
- https://doi.org/10.1007/s10118-023-3047-7