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  • 1
    Electronic Resource
    Electronic Resource
    Conductivities and some other properties of oxymethylene-linked 2-vinylpyridine-oxyethylene multiblock copolymers (1996)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 238 (1996), S. 41-53 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Oxymethylen-verknüpfte Multiblockcopolymere mit 2-Vinylpyridin- und Ethylenoxid-Monomereinheiten (2VP-EO), die mit LiClO4 oder/und Tetracyanchinodimethan (TCNQ) dotiert wurden, zeigen Ionen-, Elektronen- und gemischte (Ionen-/Elektronen-)Leitfähigkeit. Auswirkungen des Polyethylenoxidehaltes und der Molverhältnisse von EO/Li und TCNQ/2VP auf die Leitfähigkeiten der Komplexe wurden untersucht. Die optimalen Molverhältnisse betragen 10 für EO/Li und 1,0 für TCNQ/2VP. Die Copolymeren emulgieren Benzol/Wasser-Systeme und besitzen gute Phasentransferkatalysator-Eigenschaften für die Williamson-Reaktion von festem Kaliumphenolat mit n-Brombutan. Nach Neutralisation mit Salzsäure zeigen die Copolymerlösungen Polyelektrolyt-Eigenschaften.
    Notes: Oxymethylene-linked 2-vinylpyridine-oxyethylene (2VP-EO) mulitblock copolymers doped with LiClO4 or/and tetracyanoquinodimethane (TCNQ) showed ionic electronic and mixed (ionic-electronic) conductivity. Effects of the poly(oxyethylene) content and of the molar ratios of EO/Li and TCNQ/2VP on the conductivities of the complexes were studied. The optimum molar ratios of EO/Li and TCNQ/2VP were 10 and 1.0, respectively. The copolymers emulsified benzene/water systems and exhibited good phase-transfer catalysis properties in the Williamson reaction of solid potassium phenolate with n-butyl bromide. After neutralization with HCI solution, the copolymers showed polyelectrolyte solution properties.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1996.052380104
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electrically conductive polyaniline/poly(butadiene-co-styrene-co-2-vinylpyridine) latex composites (1996)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 243 (1996), S. 117-128 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Eine Reihe elektrisch leitender Polyanilin/Poly(butadien-co-styrol-co-2-vinylpyridin) (PBSP)-Verbundstoffe wurde durch Polymerisation von Anilin in Gegenwart eines PBSP-Latex hergestellt. Der Massenanteil von Polyanilin wurde durch die Variation des eingesetzten PBSP/Anilin-Verhältnisses und des Oxidans/Anilin-Molverhältnisses kontrolliert. Die Materialien wurden durch Elementaranalyse, Thermogravimetrie und Transmissionselektronenmikroskopie charakterisiert. Der Einfluß der Konzentration der Reaktanden auf die elektrische Leitfähigkeit bei Raumtemperatur und die mechanischen Eigenschaften von Filmproben der Verbundmaterialien wurde untersucht.
    Notes: A series of conducting polyaniline/poly(butadiene-co-styrene-co-2-vinylpyridine) (PBSP) latex composites was prepared by polymerization of aniline in the presence of PBSP latex. The mass loading of polyaniline in the composite latex can be controlled by varying the PBSP latex/aniline charging ratio and oxidant/aniline molar ratio. The composites were characterized by elemental analysis, transmission electron microscopy and thermogravimetric analysis. The effects of the concentration of the reactants on the conductivity at room temperature and the mechanical properties of the composite films formed from the latices were studied.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1996.052430110
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  • 3
    Electronic Resource
    Electronic Resource
    Direct synthesis of electrorheological suspension containing salt of poly(methacrylic acid) and its electrorheological effect (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 951-956 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Colloidal suspensions containing salts of poly(methacrylic acid) which exhibit high electrorheological (ER) activity were synthesized by inverse emulsion polymerization. Factors influencing the ER effect were studied. The results showed that maximum yield stress occurred at optimum amounts of both polymeric stabilizer and crosslinking agent used in the inverse emulsion polymerization as well as a certain water content of the particles, while yield stress increased with electric field strength, average diameter of the particles below 0.9 μm, or the molar ratio of the salt to the acid. The ER activity for the suspensions containing different monovalent counter ions decreased in the following order: Li+ 〉 Na+ 〉 K+ 〉 NH4+. The phenomena were discussed with the ionic polarization mechanism. © 1995 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070580512
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and properties of two kinds of nonlinear optical interpenetrating polymer networks (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 60 (1996), S. 537-542 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Two kinds of interpenetrating polymer networks (IPNs) containing 4-(4′-nitrophenyl-azo)aniline chromophore groups were synthesized. A polyacrylate network was prepared by polymerization of Dispersed Red-19 (DR-19) diacrylate, whereas an epoxy resin network was formed by reaction of Bisphenol A-type epoxy resin E44 with 4(4′-nitrophenylazo)-3-amino aniline. A polyurethane network was synthesized by reaction between (β-hydroxyl propyl acrylate-DR-1 methacrylate) copolymer and phenol-capped isocynate-terminated DR-19. IPNs based on polyacrylate/epoxy resin and IPNs based on polyurethane/epoxy resin were obtained by carrying out two corresponding kinds of reactions simultaneously. Both kinds of IPNs were characterized by gel content, IR spectra, and DSC. The first kind of IPNs exhibits two glass transition temperatures at 122 and 165°C, while the second kind of IPNs showed one broad glass transition temperature at 172°C. Thin and transparent poled films of both IPNs were prepared by spin-coating, followed by thermal curing and corona poling at 160°C for 1 h. The second-order nonlinear optical properties of the poled films were studied by a visible light absorbance measurement according to the one-dimensional rigid oriented gas model. The polyurethane/epoxy resin IPNs were more stable in dipole alignment than were the polyacrylate/epoxy resin IPNs at temperature higher than 120°C. © 1996 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks with stable second order nonlinear optical properties (1996)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 7 (1996), S. 309-314 
    Details
    ISSN: 1042-7147
    Keywords: nonlinear optical polymer ; interpenetrating polymer network ; polyurethane ; polyacrylate ; chromophore ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Interpenetrating polymer networks (IPNs) based on polyurethane and polyacrylate-containing 4-(4'-nitrophenylazo) aniline chromophore groups were synthesized and characterized by infrared spectra, gel content and differential scanning calorimetry. Thin, transparent films of the IPNs were prepared by spin-coating, followed by thermal curing and corona poling. The poled IPN film shows very good optical properties and exhibits only one glass transition temperature. The second-order nonlinear optical (NLO) properties of the poled film were studied by visible light absorbance measurement according to one-dimensional rigid oriented gas model. The second-order nonlinear optical polarizability can reach 10-7 e.s.u. The poled IPN film of defined composition showed a good temporal stability of NLO properties at 120°C for more than 160 hr.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis and properties of styrene-butadiene-oxyethylene multiblock polymers (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 61 (1996), S. 407-413 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Multiblock copolymers of styrene, butadiene, and ethylene oxide were synthesized by coupling together telechelic dihydroxyl polystyrene, telechelic dihydroxyl polybutadiene, and poly(ethylene glycol), using 2,4-toluene diisocyanate as coupling agent. The copolymers were purified by extractions and characterized by infrared (IR), 1H nuclear magnetic resonace (NMR), gel permeation chromatography (GPC), transmission electron microscopy (TEM), membrane osmometry, and dynamic viscoelastometry. The multiblock copolymers are amphiphilic, exhibiting very good emulsifying properties. They possess a good phase transfer catalytic ability in Williamson reaction, and their LiClO4 complexes exhibit a conductivity above 1 × 10-4 S/cm at 35°C. © 1996 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 7
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    Substituent-induced regioselective hydroxylation of the aromatic C–H bond on naphthalene with metachloroperbenzoic acid catalyzed by F20TPPMnCl (2012)
    Wiley-Blackwell
    Details
    Publication Date: 2012-08-31
    Description: The regioselective hydroxylation of the aromatic C–H bond on a series of naphthalenes with different β-substituent R (R = H, Me, Et, i -Pr, OMe, COOH, Br, etc.) was studied, and the substituent effect on the regioselectivity was investigated. The electron-donating substituent afforded the aromatic C–H bond hydroxylation at the 1α position with more than 80% selectivity, while the electron-withdrawing substituent afforded the aromatic C–H bond hydroxylation at the 4α position with more than 60% selectivity of β-substituted naphthalene hydroxylated with metachloroperbenzoic acid catalyzed by tetrakis(pentafluorophenyl)porphyrin manganese(III) chloride. The research showed that the steric and electronic effects of the substituent appeared to play a significant role in determining the regioselectivity, and the electronic effect was of more importance than the steric effect of the substituent in the current situation. The studies may provide additional proofs for the stepwise mechanism of the aromatic C–H bond hydroxylation through a cationic intermediate. Copyright © 2012 John Wiley & Sons, Ltd. The electron-donating substituent afforded aromatic C–H bond hydroxylation preferred at the 1α position, while the electron-withdrawing substituent afforded that preferred at the 4α position of β-substituted naphthalene hydroxylated with metachloroperbenzoic acid catalyzed by the tetrakis(pentafluorophenyl) porphyrin manganese(III) chloride.
    Print ISSN: 0894-3230
    Electronic ISSN: 1099-1395
    Topics: Chemistry and Pharmacology , Physics
    Published by Wiley-Blackwell
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  • 8
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    Instantaneous electron beam emittance measurement system based on the optical transition radiation principle (2014)
    Institute of Physics (IOP)
    Details
    Publication Date: 2014-01-23
    Description: One kind of instantaneous electron beam emittance measurement system based on the optical transition radiation principle and double imaging optical method has been set up. It is mainly adopted in the test for the intense electron-beam produced by a linear induction accelerator. The system features two characteristics. The first one concerns the system synchronization signal triggered by the following edge of the main output waveform from a Blumlein switch. The synchronous precision of about 1 ns between the electron beam and the image capture time can be reached in this way so that the electron beam emittance at the desired time point can be obtained. The other advantage of the system is the ability to obtain the beam spot and beam divergence in one measurement so that the calculated result is the true beam emittance at that time, which can explain the electron beam condition. It provides to be a powerful beam diagnostic method for a 2.5 kA, 18.5 MeV, 90 ns (FWHM) electron beam ...
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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