Welcome to Seiji Inaoka's Professional page.
Here, if you would like, you could download my resume file or my CV file (in MS Word format), which have more detail information.
Or, please see the below for my past appearance to peer-reviewed scientific journals.
Please send me email if you have any questions. Thank you, and I look forward to hearing from you!!
Roitman, D. B.; Inaoka, S.; Advincula, R. US Patent No. 6,552,101, April 2003.
Abstract: A precursor polymer that can be electrochemically polymerized to form an electrically conducting polymer. A precursor according to the present invention includes a plurality of electrochemical polymerizable monomers, each monomer having first and second polymer-forming active sites that can be joined by electrochemical polymerization. The monomers also include third and fourth polymer-forming active sites that can be joined chemically in solution. The monomers in the precursor polymer are linked by the third and fourth polymer-forming active sites. The monomers are chosen such the precursor polymer is soluble in a predetermined solvent while the polymer resulting from the electrochemical polymerization of the precursor polymers via the first and second polymer-forming sites is electrically conducting and insoluble in the solvent. The monomers can be synthesized from fluorene, triophene, pyrrol, biphenyl, poly(vinyl carbazole) or poly (vinyl oxy thiophene). Monomers comprising dimers chosen from this group can also be utilized. The monomers may also include a spacer group bonded to one of the first or second polymer-forming active sites. Spacer groups consisting of (CH2).sub.n, (OCH2)n, or (OCH2CH2)n, where 1<=n=<20 may be utilized for this purpose.
Roitman, D. B.; Inaoka, S.; Advincula, R. US Patent No. 6,533,918, March 2003.
Abstract: A method for depositing an electrically conducting film on an electrode and the film resulting from that method. An electrically conducting film according to the present invention is deposited by immersing the electrode in a solution of a precursor polymer in a predetermined solvent. The precursor polymer includes a plurality of electrochemical polymerizable monomers. Each monomer has first and second polymer-forming active sites that can be joined by electrochemical polymerization and third and fourth polymer-forming active sites that can be joined chemically in solution. The precursor polymer is constructed from the monomers joined by the third and fourth polymer-forming active sites. The precursor polymer is soluble in the solvent whereas a polymer formed by electrochemical polymerization of the first and second polymer-forming active sites is insoluble in the solvent. An electrical potential is applied to the electrode to cause monomers of the precursor polymer molecules to be joined electrochemically by their first and second polymer-forming active sites.
Inaoka, S.; Advincula, R. C. "Synthesis and Oxidative Cross-Linking of Fluorene-Containing Polymers To Form Conjugated Network Polyfluorenes: Poly(fluoren-9,9-diyl-alt-alkan-alpha,omega-diyl)", Macromolecules 2002, 35, 2426-2428 (MA011466K).
Abstract: The use of fluorene and its derivatives
as laser-generating or photoactive fluorescent materials
is well-known. In particular, recent interest in the
synthesis of pi-conjugated fluorene polymer materials
with fluoren-2,7-diyl units synthesized by either palladium-
or nickel-catalyzed coupling of 2,7-dibromofluorenes
has found applications in the fabrication of
blue polymer light-emitting diode (PLED) devices.
Suzuki coupling between 2,7-dibromofluorene and 2,7-
dioxaborolanyl fluorene derivatives, chemical oxidation
of fluorenes with FeCl3, or electrochemical oxidation
of fluorenes has also been reported. Intractability and
insolubility are a common problem with stiff conjugated
polymers with increasing conjugation efficiencies. For
the polymers derived from fluorenyl units, substitution
at the 9-fluorenyl positions enhances the solubility and
processability of the resulting polymers. The two acidic
hydrogens on the 9-position are available for lithiation,
and 9,9-dilithiofluorenes have been found to react
readily with monobromoalkanes resulting in carboncarbon
bond formation.
In an effort to prepare polymer materials with tethered
fluorene units, we have prepared a series of
polymers containing fluorene units directly attached to
the polymer main chain and separated by a series of
alkylene spacer units. The goal is to utilize this
"precursor polymer" toward the synthesis of conjugated
polyfluorene network species via a cross-linking
reaction. This poly(fluoren-9,9-diyl-alt-alkan-alpha,omega-diyl)
polymers as we describe in this paper were obtained
from a modified nucleophilic substitution reaction derived
from a stoichiometric 1:1 combination of 9,9-
dilithiofluorene and alphaomega-dibromoalkane. Crosslinking
at the 2,7-positions produced a network conjugated
polymer (or oligomer) derivative achieved by
chemical oxidation. The procedure involved the use of
the FeCl3 system as reported by Yoshino and coworkers.
To our knowledge this is the first reported
systematic procedure for the synthesis of pi-conjugated
poly(fluorene) derivative via cross-linking of a homologous
series of precursor fluorene-containing polymers.
Roitman, D. B.; Inaoka, S.; Advincula, R. US Patent No. 6,294,245, September 2001.
Abstract: A method for depositing an electrically conducting film on an electrode and the film resulting from that method. An electrically conducting film according to the present invention is deposited by immersing the electrode in a solution of a precursor polymer in a predetermined solvent. The precursor polymer includes a plurality of electrochemical polymerizable monomers. Each monomer has first and second polymer-forming active sites that can be joined by electrochemical polymerization and third and fourth polymer-forming active sites that can be joined chemically in solution. The precursor polymer is constructed from the monomers joined by the third and fourth polymer-forming active sites. The precursor polymer is soluble in the solvent whereas a polymer formed by electrochemical polymerization of the first and second polymer- forming active sites is insoluble in the solvent.
Inaoka, S.; Collard, D. M. "Chemical and Electrochemical Polymerization of 3-Alkylthiophenes on Self-assembled Monolayers of Oligothiophene-Substituted Alkylsilanes", Langmuir 1999, 15, 3752.
Abstract: Monolayers of oligothiophene-substituted alkylsilanes, chlorodimethyl(11-(3-(2,2'bithienyl))undecyl)-silane and chlorodimethyl(11-(3'-(2,2':5',2"-terthienyl))undecyl)silane, are subject to electrochemical oxidation within the monolayer to afford more highly conjugated oligomers with lower redox potentials. The electrochemical polymerization of 3-methylthiophene is promoted by monolayers of the oligothiophene-substituted silanes on the electrode surface to form smooth, highly adherent films of poly(3-methylthiophene). The effect of monolayers of an electroactive monomer on the rate of deposition of poly(3-methylthiophene) is compared to the effect of low concentrations of oligomers in solution. Chemical polymerization of 3-octylthiophene on substrates modified with the redox-active silanes gives films of poly(3-octylthiophene) which display reversible solvatochromism without dissolving the polymer. These thin films are sensitive to low concentrations of chloroform in the vapor phase or in aqueous solution.
Inaoka, S.; Collard, D. M. "Synthesis, polymerization and characterization of substituted dithieno[3,4-b:3',4'-d]thiophenes", Journal of Materials Chemistry 1999, 9, 1719.
Abstract: Chemical or electrochemical oxidation of substituted dithieno[3,4-b:3',4'-d]thiophenes provides polymers with defined regiochemical structures. These materials have lower bandgaps (0.7-0.9 eV) than the unsubstituted fused heteroarene. Potential cycling of the 1,3-dimethyl substituted polymer film shows repetitive p- and n-dopability. The chemically-prepared dioctyl analog is soluble in common solvents such as chloroform, dichloromethane and THF. However, overoxidation of the polymers at an electrode surface presents a limitation to the polymerization of substituted analogs of the parent fused heteroarene.
Inaoka, S.; Collard, D. M. "Polymerization of Substituted Dithieno[3,4-b:3',4'-d]thiophenes", Synthetic Metals 1997, 84, 193.
Abstract: Alkyl substituted dithieno[3,4-b:3',4'-d]thiophenes are subject to electrooxidative polymerization to afford electronically conductive polymer films. Whereas the parent fused heterocycle has four alpha-thienyl positions through which polymerization can occur, disubstituted monomers afford well-defined polymer structures. The 2,5-dioctyl analog is soluble in common organic solvents.
Inaoka, S. US Patent No. 5,380,225, January 10, 1995.
Abstract: A connector includes a jack and a plug having corresponding staggered contacts formed by alternating projections and recesses which permits the connector to have a higher contact density than conventional connectors.
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