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  • 1
    Electronic Resource
    Electronic Resource
    Determination of the sequence distribution and stereoregularity of ethyl α-benzoyloxymethylacrylate-methyl methacrylate copolymers by means of proton and carbon-13 NMR (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 3483-3493 
    Details
    ISSN: 0887-624X
    Keywords: 1H-NMR ; 13C-NMR ; ethyl α-benzoyloxymethylacrylate ; methyl methacrylate ; copolymers ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Proton and Carbon-13 NMR spectra of ethyl α-benzoyloxymethylacrylate (E)-methyl methacrylate (M) copolymers were analyzed in terms of sequence distribution and stereoregularity of monomer units. The copolymers were prepared by free radical polymerization in benzene at 50°C. The methoxy region of the M proton signal resonance was found to be sensitive to the copolymer composition for M-centred sequences. The carbon-13 NMR spectra of the EM copolymers, in particular the carbonyl signal resonances of carbomethoxy and carboethoxy groups, are discussed in terms of M- and E-centred configurational sequences. The experimental values were in excellent agreement with those calculated taken into account the terminal copolymerization model and Bernoullian distribution of stereoregularity with the statistical parameters determined from reactivity ratios rE = 0.32 and rM = 1.34 and the coisotacticity parameters σMM = 0.22, σEE = 0.70, and σME = σEM = σ = 0.30. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 3483-3493, 1997
    Additional Material: 6 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetic study of free-radical copolymerization of ethyl α-benzoyloxymethylacrylate with methyl methacrylate in benzene (1995)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 16 (1995), S. 503-512 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: From a phenomenological point of view, the Mayo-Lewis terminal model can describe both copolymer composition and the variation of copolymerization rate for the ethyl α-benzoyloxymethylacrylate/methyl methacrylate/benzene/2,2′-azoisobutyronitrile system.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1995.030160708
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and properties of epoxy-episulfide resins (1996)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 240 (1996), S. 67-81 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Standard epoxy resins have good mechanical properties, but their prolonged low temperature curing time limits their potential use in clinical applications as well as in many industrial applications. A fast-curing epoxy-episulfide resin has been developed. The gel time of epoxy-episulfide made from EPONTrade mark of Shell Chemical Company. 828 ranges from 2 to 10 minutes by changing the ratio of the ingredients. The heat of reaction of this system is low, resulting in low cure shrinkage. Water absorption of the episulfide network is low. The epoxy-episulfide system cured with polyamide curing agent V-40 exhibits two transition temperatures, at about 85°C and 130°C, as shown in dynamic mechanical analysis data. In order to solve the long term stability problem of the above episulfides, and also the mixing problem, a lower viscosity resin, Eponex, was used to make Eponex-sulfide. Eponex-sulfide systems show promise in that they remain in a stable liquid form without epoxy. The other advantages appear to be retained.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1996.052400106
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  • 4
    Electronic Resource
    Electronic Resource
    Evidence of interchange reaction in a poly(ethylene 2,6-naphthalenedicarboxylate)/poly(bisphenol-A carbonate) blend (1995)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 16 (1995), S. 483-488 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The existence of interchange reactions in a poly(ethylene 2,6-naphthalenedicarboxylate)/poly(bisphenol-A carbonate) blend (PEN/PC) has been proven by means of solubility tests, DSC and FTIR and NMR spectroscopies. In addition, DSC results reveal that these interchange reactions are responsible for the miscibilization of the initially immiscible system.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1995.030160705
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of the transfer constant of α-thioglycerol in methyl methacrylate free-radical polymerization (1997)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 198 (1997), S. 3883-3892 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Using the Mayo and the Clay-Gilbert method, the transfer rate coefficient of α-thioglycerol (TG) was determined at 50°C for the polymerization of methyl methacrylate (MMA) in a 3 mol · L-1 tetrahydrofuran solution using different amounts of 2,2′-azoisobutyronitrile (AIBN) as initiator. The transfer rate coefficient was found to be independent of the initiator concentration and higher by a factor of 1.6 when obtained according to the Clay-Gilbert method compared to the Mayo method.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1997.021981210
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  • 6
    Electronic Resource
    Electronic Resource
    Oxidative behavior of aminohalogenbenzophenones - indirect determination of benzodiazepinooxazoles (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 189-193 
    Details
    ISSN: 1040-0397
    Keywords: Aminohalogenbenzophenones ; Benzodiazepinooxazoles ; Pharmaceutical preparations ; Pulse voltammetry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An electroanalytical study of three aminohalogenbenzophenones: 2-amino-5-chlorobenzophenone (MCB), 2-amino-2′,5-dichlorobenzo-phenone (DCB), and 2-amino-5-bromo-2′-fluorobenzophenone (BrFB); metabolites of the psychotropic drugs benzodiazepinooxazoles and benzodiazepines, has been carried out at a glassy carbon electrode using different voltammetric techniques. The compounds studied are electrooxidizable in a hydroalcoholic medium (MeOH:H2O, 10 : 90), 0.5 M KC1, and a pH range of 1-13. The oxidation processes are irreversible and predominantly diffusion controlled. On the basis of the oxidation process, voltammetric methods have been developed that allow the determination of aminohalogenbenzophenones from 0.2 to 15ppm for MCB and BrFB, and 0.2 to 14ppm for DCB; with a reproducibility in terms of relative standard deviation (RSD) lower than 5.2% for 10 determinations of 10 ppm solutions of MCB, DCB, and BrFB. Detection limits of 200ppb (μg/L) for MCB and DCB, and 100ppb for BrFB were obtained. The voltammetric method developed for DCB has been applied to the indirect determination of Cloxazolam in tablets.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140070216
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  • 7
    Electronic Resource
    Electronic Resource
    Network simulation of the first- and second-order catalytic mechanism for chronoamperometry (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 1145-1149 
    Details
    ISSN: 1040-0397
    Keywords: Catalytic mechanism ; Network method ; Diffusion-reaction processes ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Network approach is a simulation method whereby physico-chemical systems are replaced by electrical networks and solved by applying the software package PSPICE. In order to show the explicit use of this method, the modeling and simulation of the catalytic mechanism have been carried out. The results are compared with analytical and numerical solutions of the differential equations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140081214
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  • 8
    Electronic Resource
    Electronic Resource
    Quantitative chemical depth profiles of ZrN/BN multilayers Dedicated to Professor Siegfried Hofmann on the occasion of his 60th birthday. (1998)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 26 (1998), S. 806-814 
    Details
    ISSN: 0142-2421
    Keywords: multilayers ; ZrN ; BN ; AES ; RBS ; depth profiling ; factor analysis ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Multilayers of ZrN/BN have been deposited on Si(100) using a double ion beam sputtering system. The multilayers have been characterized by transmission electron microscopy, Rutherford backscattering spectroscopy and Auger electron spectroscopy (AES) depth profiles in order to get a quantitative analysis of the components and contaminants in the different layers and at their respective interfaces. Factor analysis is used to deconvolute the different chemical states of the components and to identify secondary phases and compounds that determine the quality of the multilayer. Two secondary phases have been observed at the different interfaces: one is associated with the incorporation of oxygen, mainly in the zirconium layer, and leads to the formation of ZrNxOy. In addition we have observed that Ar bombardment during the AES depth profile leads to the formation of ZrBxNy in all the interfaces. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 8 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Calibration of the Probing Depth by Total Electron Yield of EXAFS Spectra in Oxide Overlayers (Ta2O5, TiO2, ZrO2) (1997)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 707-714 
    Details
    ISSN: 0142-2421
    Keywords: x-ray absorption spectroscopy ; total electron yield ; oxides ; EXAFS probing depth ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Calibration of the probing depth by x-ray absorption spectroscopy (XAS) in oxide materials is intended by measurement of the total electron yield (TEY) of electrons ejected by absorption of the radiation. Measurements have been carried out for three series of electrolytic metal oxide overlayers with different thickness. The experiments have been conducted at the Ti K, Ta LIII and Zr K edges. Analysis of the XAS spectra is carried out by factor analysis and conventional Fourier transformation and fitting analysis. The data showed that the information depth by XAS follows the order ZrO2〉TiO2〉Ta2O5 at the Ti K, Ta LIII and Zr K edges.As an alternative, the absorption spectra of the same samples were measured in the conversion electron yield (CEY) mode: i.e. by measuring the current of He+ ions produced by the ejected electrons in an atmosphere of He in contact with the sample. Here, the information depth is slightly different from that obtained by TEY. © 1997 by John Wiley & Sons, Ltd.
    Additional Material: 8 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Substrate Effects and Chemical State Plots for the XPS Analysis of Supported TiO2 Catalysts (1997)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 292-294 
    Details
    ISSN: 0142-2421
    Keywords: XPS ; Auger parameter ; TiO2 ; catalyst ; chemical state plot ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The analysis by XPS of TiO2 deposited on different substrates (SiO2, MgO, Ag, SnO) shows the existence of shifts in the Ti 2p binding energy and Auger parameter values. The magnitude of these shifts is a function of the support and of the coverage. A systematic representation of these shifts is possible with a chemical state plot. The implications of the existence of such shifts for the characterization of catalysts are discussed. © 1997 by John Wiley & Sons, Ltd.
    Additional Material: 2 Ill.
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