The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Sadahito Aoshima - One of the best experts on this subject based on the ideXlab platform.
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in situ and readily prepared Metal catalysts and initiators for living cationic polymerization of isobutyl vinyl ether dual purpose salphen as a ligand framework for zrcl4 and an initiating proton source
Polymer Chemistry, 2015Co-Authors: Sensho Kigoshi, Arihiro Kanazawa, Shokyoku Kanaoka, Sadahito AoshimaAbstract:A salphen complex [salphen = N,N′-o-phenylene-bis(3,5-di-tert-butyl-salicylidene-imine)], synthesized in situ by mixing a salphen ligand with a Metal Chloride is shown to be an effective catalyst in cationic polymerization for the first time. Furthermore, the salphen/ZrCl4 system induced the living cationic polymerization of isobutyl vinyl ether in toluene at 0 °C with quantitative initiation from HCl simultaneously generated upon the complex formation.
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living cationic polymerization of vinyl ether with methanol Metal Chloride initiating systems relationship between polymerization behavior and the nature of lewis acids
Macromolecules, 2010Co-Authors: Arihiro Kanazawa, Shokyoku Kanaoka, Sadahito AoshimaAbstract:Cationic polymerization of vinyl ether (VE) was examined with methanol/Metal Chloride initiating systems instead of those with the conventionally used VE−protonic acid adduct initiators. With MoCl5, a highly oxophilic Metal halide, the polymerization of isobutyl VE (IBVE) using methanol proceeded in a living fashion in the presence of ethyl acetate, although the reaction was not controlled in conjunction with IBVE−HCl adduct. Furthermore, in the methanol-initiated polymerization, the Lewis acids used could be classified mainly into three categories in terms of polymerization behavior: those producing long-lived species (e.g., MoCl5, NbCl5, and ZrCl4), those inducing uncontrolled polymerization (e.g., GaCl3 and FeCl3), or those showing no activity at all (e.g., ZnCl2 and InCl3). The matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI−TOF−MS) spectra of the product polymers and the direct 1H NMR analysis of the reaction mixtures revealed that the controlled polymerization sta...
Arihiro Kanazawa - One of the best experts on this subject based on the ideXlab platform.
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in situ and readily prepared Metal catalysts and initiators for living cationic polymerization of isobutyl vinyl ether dual purpose salphen as a ligand framework for zrcl4 and an initiating proton source
Polymer Chemistry, 2015Co-Authors: Sensho Kigoshi, Arihiro Kanazawa, Shokyoku Kanaoka, Sadahito AoshimaAbstract:A salphen complex [salphen = N,N′-o-phenylene-bis(3,5-di-tert-butyl-salicylidene-imine)], synthesized in situ by mixing a salphen ligand with a Metal Chloride is shown to be an effective catalyst in cationic polymerization for the first time. Furthermore, the salphen/ZrCl4 system induced the living cationic polymerization of isobutyl vinyl ether in toluene at 0 °C with quantitative initiation from HCl simultaneously generated upon the complex formation.
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living cationic polymerization of vinyl ether with methanol Metal Chloride initiating systems relationship between polymerization behavior and the nature of lewis acids
Macromolecules, 2010Co-Authors: Arihiro Kanazawa, Shokyoku Kanaoka, Sadahito AoshimaAbstract:Cationic polymerization of vinyl ether (VE) was examined with methanol/Metal Chloride initiating systems instead of those with the conventionally used VE−protonic acid adduct initiators. With MoCl5, a highly oxophilic Metal halide, the polymerization of isobutyl VE (IBVE) using methanol proceeded in a living fashion in the presence of ethyl acetate, although the reaction was not controlled in conjunction with IBVE−HCl adduct. Furthermore, in the methanol-initiated polymerization, the Lewis acids used could be classified mainly into three categories in terms of polymerization behavior: those producing long-lived species (e.g., MoCl5, NbCl5, and ZrCl4), those inducing uncontrolled polymerization (e.g., GaCl3 and FeCl3), or those showing no activity at all (e.g., ZnCl2 and InCl3). The matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI−TOF−MS) spectra of the product polymers and the direct 1H NMR analysis of the reaction mixtures revealed that the controlled polymerization sta...
Jinwoo Cheon - One of the best experts on this subject based on the ideXlab platform.
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in situ one pot synthesis of 1 dimensional transition Metal oxide nanocrystals
Journal of Physical Chemistry B, 2005Co-Authors: Seung Jin Ko, Jinwoo CheonAbstract:One-dimensional colloidal Metal oxide nanocrystals are of great importance in materials chemistry, but reports on these materials are rare due to lack of well-defined synthetic protocols. In this paper, we present a general and highly effective one-pot synthetic protocol to produce 1-dimensional nanostructures of transition Metal oxide (e.g., W18O49, TiO2, Mn3O4, and V2O5) through thermally induced crystal growth processes from a mixture of Metal Chloride and surfactants.
Yitai Qian - One of the best experts on this subject based on the ideXlab platform.
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low temperature synthesis of Metal tungstates nanocrystallites in ethylene glycol
Materials Research Bulletin, 2003Co-Authors: Di Chen, Guozhen Shen, Kaibin Tang, Huagui Zheng, Yitai QianAbstract:Abstract In this paper, we report the low-temperature synthesis of Metal tungstate, MWO4 (M=Ca, Sr, Ba, Cd, Zn, Pb) nanocrystallites. By reaction between Metal Chloride and sodium tungstate in ethylene glycol at 180 °C for 10 h, well-crystallized tungstate particles were successfully obtained. Characterization by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) shows that the product powders consist of nanosize particles. Photoluminescence measurement reveals that the as-obtained CaWO4, CdWO4, and PbWO4 show excitonic peaks at about 430, 500 and 500 nm, respectively. The solvent and reaction conditions are important in the formation of the products.
Shokyoku Kanaoka - One of the best experts on this subject based on the ideXlab platform.
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in situ and readily prepared Metal catalysts and initiators for living cationic polymerization of isobutyl vinyl ether dual purpose salphen as a ligand framework for zrcl4 and an initiating proton source
Polymer Chemistry, 2015Co-Authors: Sensho Kigoshi, Arihiro Kanazawa, Shokyoku Kanaoka, Sadahito AoshimaAbstract:A salphen complex [salphen = N,N′-o-phenylene-bis(3,5-di-tert-butyl-salicylidene-imine)], synthesized in situ by mixing a salphen ligand with a Metal Chloride is shown to be an effective catalyst in cationic polymerization for the first time. Furthermore, the salphen/ZrCl4 system induced the living cationic polymerization of isobutyl vinyl ether in toluene at 0 °C with quantitative initiation from HCl simultaneously generated upon the complex formation.
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living cationic polymerization of vinyl ether with methanol Metal Chloride initiating systems relationship between polymerization behavior and the nature of lewis acids
Macromolecules, 2010Co-Authors: Arihiro Kanazawa, Shokyoku Kanaoka, Sadahito AoshimaAbstract:Cationic polymerization of vinyl ether (VE) was examined with methanol/Metal Chloride initiating systems instead of those with the conventionally used VE−protonic acid adduct initiators. With MoCl5, a highly oxophilic Metal halide, the polymerization of isobutyl VE (IBVE) using methanol proceeded in a living fashion in the presence of ethyl acetate, although the reaction was not controlled in conjunction with IBVE−HCl adduct. Furthermore, in the methanol-initiated polymerization, the Lewis acids used could be classified mainly into three categories in terms of polymerization behavior: those producing long-lived species (e.g., MoCl5, NbCl5, and ZrCl4), those inducing uncontrolled polymerization (e.g., GaCl3 and FeCl3), or those showing no activity at all (e.g., ZnCl2 and InCl3). The matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI−TOF−MS) spectra of the product polymers and the direct 1H NMR analysis of the reaction mixtures revealed that the controlled polymerization sta...