Journal ArticleDOI
Stereoselective Polymerization of Conjugated Dienes and Styrene−Butadiene Copolymerization Promoted by Octahedral Titanium Catalyst
Stefano Milione,Cinzia Cuomo,Carmine Capacchione,Carla Zannoni,and Alfonso Grassi,Antonio Proto +5 more
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TLDR
In this article, the ability of the dichloro{1,4-dithiabutanediyl-2,2‘-bis(4,6-di-tert-butylphenoxy)}titanium complex to catalyze homopolymerization of conjugated dienes and copolymerisation of butadiene with styrene is reported.Abstract:
The ability of the dichloro{1,4-dithiabutanediyl-2,2‘-bis(4,6-di-tert-butylphenoxy)}titanium complex (1) to catalyze homopolymerization of conjugated dienes and copolymerization of butadiene with styrene is reported. After proper activation with methylalumoxane, 1 resulted active in the trans-1,4 selective polymerization of butadiene and isoprene with good activity. The molecular weight distributions of the polymers are monomodal with the polydispersity indexes, consistent with a single site behavior of the catalyst. Isotactic polystyrene-co-trans-1,4-polybutadiene with an unprecedented architecture, covering a wide range of compositions (xS = 0.15−0.97), were also obtained. The chemo- and stereoselectivity of butadiene insertion and the isospecific styrene polymerization of the title catalyst are retained when the two monomers are copolymerized. The molecular weight distributions are consistent with the material being copolymeric in nature. The reactivity ratios values and the microstructure analysis (by...read more
Citations
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Journal ArticleDOI
Alternating and Random Copolymerization of Isoprene and Ethylene Catalyzed by Cationic Half-Sandwich Scandium Alkyls
TL;DR: The acid-base reactions between the scandium trialkyl complex Sc(CH(2)SiMe(3))(3)(THF)(2) and 1 equiv of Cp'-H afforded straightforwardly the corresponding mono(cyclopentadienyl)scandium dialkyl complexes Cp'Sc( 2)Si me(3)(THF)(2), which showed high cis-1,4 selectivity under the same conditions.
Journal ArticleDOI
Stereochemical enhancement of polymer properties
Joshua C. Worch,Hannah Prydderch,Sètuhn Jimaja,Panagiotis Bexis,Matthew L. Becker,Andrew P. Dove +5 more
TL;DR: A review of the state of the art with respect to how stereochemistry in polymers has been used to influence and control their physical and mechanical properties, as well as begin to control their function is presented in this paper.
Book ChapterDOI
Polymerization of 1,3-Conjugated Dienes with Rare-Earth Metal Precursors
TL;DR: In this paper, a survey of the publications related to cis-1,4-, trans-1/4-, 1/4, 3/4-regio-, and stereoselective polymerization of 1/3-conjugated dienes with rare-earth metal-based catalytic systems is presented.
Journal ArticleDOI
Scandium-Catalyzed Syndiospecific Copolymerization of Styrene with Isoprene
Hao Zhang,Yunjie Luo,Zhaomin Hou +2 more
Journal ArticleDOI
A lutetium allyl complex that bears a pyridyl-functionalized cyclopentadienyl ligand: dual catalysis on highly syndiospecific and cis-1,4-selective (co)polymerizations of styrene and butadiene.
TL;DR: This represents the first example of a lutetium-based catalyst showing both high activity and selectivity for the (co)polymerization of styrene and butadiene.
References
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BookDOI
Applied Homogeneous Catalysis with Organometallic Compounds
Boy Cornils,Wolfgang A. Herrmann +1 more
Journal ArticleDOI
Linear method for determining monomer reactivity ratios in copolymerization
Morton A. Fineman,Sidney D. Ross +1 more
Journal ArticleDOI
A review of high resolution liquid 13carbon nuclear magnetic resonance characterizations of ethylene-based polymers
TL;DR: The use of 13 carbon nuclear magnetic resonance (NMR) spectroscopy in the molecular characterization of macromolecules has advanced our knowledge into structural areas that have been nearly impossible to measure by other spectroscopic techniques as mentioned in this paper.
Journal ArticleDOI
Ancillary ligand effect on single-site styrene polymerization: isospecificity of group 4 metal bis(phenolate) catalysts.
Carmine Capacchione,Antonio Proto,Henner Ebeling,Rolf Mülhaupt,Klaus Möller,Thomas P. Spaniol,Jun Okuda +6 more
TL;DR: Styrene is polymerized isospecifically by group 4 metal complexes that contain a C2-symmetrically coordinated 1,4-dithiabutane-linked bis(phenolato) ligand activated by methylaluminoxane.
Related Papers (5)
Highly cis-1,4 Selective Polymerization of Dienes with Homogeneous Ziegler−Natta Catalysts Based on NCN-Pincer Rare Earth Metal Dichloride Precursors
Wei Gao,Dongmei Cui +1 more