Journal ArticleDOI
Living Polymerization of Propene with Alkyltitanium-Based Catalysts
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TLDR
In this paper, a living polymerization of propene with alkyltitanium-based catalysts is described with emphasis on the role of the activators employed, and the heterogenization of the living systems is attempted by supporting MAO, MMAO and dried MMAO on SiO2 as solid activators.Abstract:
Living polymerization of propene with alkyltitanium-based catalysts is described with emphasis on the role of the activators employed. (η1 : η3-tert-Butyl(dimethylfluorenylsilyl)amido)dimethyltitanium activated by tris(pentafluorophenyl)borane (B(C6F5)3) catalyzes the living polymerization at -50 °C. The use of dried methylaluminoxane (MAO) in place of B(C6F5)3 raises the living polymerization temperature to 0 °C and improves the syndiospecificity. A chelating diamide dimethyltitanium activated by dried modified MAO (MMAO) catalyzes the living polymerization at 0 °C to give a statistically atactic polymer. The heterogenization of the living systems is attempted by supporting MAO, MMAO and dried MMAO on SiO2 as solid activators.read more
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Living alkene polymerization : New methods for the precision synthesis of polyolefins
TL;DR: A comprehensive account of living alkene polymerization systems with special attention paid to systems developed in the last five years can be found in this article, where the authors present a detailed review of the most relevant methods.
Journal ArticleDOI
DFT investigation of the 'quasi-living' propene polymerisation with Cp*TiMe3/B(C6F5)3: the 'naked cation' approach.
TL;DR: It is found that beta-H elimination is a rare event due to the rather high activation barrier, and it can be concluded that the quasi-living polymerisation is at least partly an intrinsic property of the cation.
Journal ArticleDOI
Taming the shrew: [TMEDALi-Zn(C2H4)(2)L] as a model compound for anionic ethene polymerisation
TL;DR: In this paper, the authors describe the synthesis of the compound (TMEDA)Li(μ-TMP)(μ-CHCH2)Zn(C2H3), which serves as a potential model compound for anionic ethene polymerisation.
References
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Journal ArticleDOI
Stereospecific Olefin Polymerization with Chiral Metallocene Catalysts
TL;DR: In contrast to heterogeneous Ziegler-Natta catalysts, homogeneous metallocene-based catalysts as discussed by the authors allow efficient control of regio-and stereoregularities, molecular weights and molecular weight distributions, and comonomer incorporation.
Journal ArticleDOI
The Search for New-Generation Olefin Polymerization Catalysts: Life beyond Metallocenes.
TL;DR: Even late transition metal complexes function as active and selective catalysts for α-olefin polymerization, and an intense search has developed for new-generation catalysts, in both academic and industrial research laboratories.
Journal ArticleDOI
Cocatalysts for Metal-Catalyzed Olefin Polymerization: Activators, Activation Processes, and Structure−Activity Relationships
TL;DR: Commercialization of new generations of single-site and metallocene catalyst-based technologies has provided the multibillion pound per year polyolefins industry with the ability to deliver a wide range of new and innovative olefin-based polymers having improved properties.