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排序方式: 共有95条查询结果,搜索用时 15 毫秒
1.
Stefan Mecking 《Colloid and polymer science》2007,285(6):605-619
By contrast to traditional free radical emulsion polymerization, catalytic polymerization allows for polymer microstructure
control. In terms of polymerizable monomers, both techniques are largely complementary. Since the beginning of this decade,
an increasing number of reports on polyolefin, polybutadiene, polyalkenamer, polynorbornene, polyketone, and polyacetylene
dispersions prepared by catalytic polymerization in disperse aqueous systems has appeared. This contribution reviews the preparation
of these dispersions, their colloidal properties, particle formation mechanisms, particle morphologies, and polymer microstructures. 相似文献
2.
M. Sc. Moritz C. Baier Dr. Martin A. Zuideveld Prof. Dr. Stefan Mecking 《Angewandte Chemie (International ed. in English)》2014,53(37):9722-9744
Research on “post‐metallocene” polymerization catalysis ranges methodologically from fundamental mechanistic studies of polymerization reactions over catalyst design to material properties of the polyolefins prepared. A common goal of these studies is the creation of practically useful new polyolefin materials or polymerization processes. This Review gives a comprehensive overview of post‐metallocene polymerization catalysts that have been put into practice. The decisive properties for this success of a given catalyst structure are delineated. 相似文献
3.
Manuel Schnitte Janine S. Scholliers Kai Riedmiller Stefan Mecking 《Angewandte Chemie (International ed. in English)》2020,59(8):3258-3263
In various nickel(II) salicylaldiminato ethylene polymerization catalysts, which are a versatile mechanistic probe for substituent effects, longer perfluoroalkyl groups exert a strong effect on catalytic activities and polymer microstructures compared to the trifluoromethyl group. This effect is accounted for by a reduced electron density on the active sites, and is also supported by electrochemical studies. Thus, β‐hydride elimination, the key step of chain transfer and branching pathways, is disfavored while chain‐growth rates are enhanced. This enhancement occurs to an extent that enables living polymerizations in aqueous systems to afford ultra‐high‐molecular‐weight polyethylene for various chelating salicylaldimine motifs. These findings are mechanistically instructive as well as practically useful for illustrating the potential of perfluoroalkyl groups in catalyst design. 相似文献
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Rünzi T Guironnet D Göttker-Schnetmann I Mecking S 《Journal of the American Chemical Society》2010,132(46):16623-16630
Polymerization of ethylene by complexes [{(P^O)PdMe(L)}] (P^O = κ(2)-(P,O)-2-(2-MeOC(6)H(4))(2)PC(6)H(4)SO(3))) affords homopolyethylene free of any methyl methacrylate (MMA)-derived units, even in the presence of substantial concentrations of MMA. In stoichiometric studies, reactive {(P^O)Pd(Me)L} fragments generated by halide abstraction from [({(P^O)Pd(Me)Cl}μ-Na)(2)] insert MMA in a 1,2- as well as 2,1-mode. The 1,2-insertion product forms a stable five-membered chelate by coordination of the carbonyl group. Thermodynamic parameters for MMA insertion are ΔH(++) = 69.0(3.1) kJ mol(-1) and ΔS(++) = -103(10) J mol(-1) K(-1) (total average for 1,2- and 2,1-insertion), in comparison to ΔH(++) = 48.5(3.0) kJ mol(-1) and ΔS(++) = -138(7) J mol(-1) K(-1) for methyl acrylate (MA) insertion. These data agree with an observed at least 10(2)-fold preference for MA incorporation vs MMA incorporation (not detected) under polymerization conditions. Copolymerization of ethylene with a bifunctional acrylate-methacrylate monomer yields linear polyethylenes with intact methacrylate substituents. Post-polymerization modification of the latter was exemplified by free-radical thiol addition and by cross-metathesis. 相似文献
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Cover Picture: Polymerization Catalyst Laser‐Interference Patterning (Angew. Chem. Int. Ed. 41/2011)
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9.
J. Arends H.J. Gassen A. Hegerath B. Mecking G. Nöldeke P. Prenzel T. Reichelt A. Voswinkel W.W. Sapp 《Nuclear Physics A》1984,412(3):509-522
Differential cross sections for the deuteron photodisintegration process were measured for photon energies between 200 and 440 MeV using the tagged photon beam facility of the Bonn 500 MeV synchrotron. At eight angles between 18° and 145° charged particles were detected simultaneously in time-of-flight spectrometers consisting of scintillation counters. Above the resonance region the measured cross sections agree fairly well with earlier results, whereas there are larger discrepancies at low photon energies. 相似文献
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