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  • 1
    Electronic Resource
    Electronic Resource
    Novel PPV derivatives emitting light over a broad wavelength rangeThis work was supported by the Korea Science and Engineering Foundation. (1997)
    Weinheim : Wiley-Blackwell
    Advanced Materials 9 (1997), S. 551-554 
    Details
    ISSN: 0935-9648
    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
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19970090706
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  • 2
    Electronic Resource
    Electronic Resource
    A new kind of immobilized enzyme multilayer based on cationic and anionic interaction (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 15 (1994), S. 405-409 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1994.030150503
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  • 3
    Electronic Resource
    Electronic Resource
    A novel synthesis of acrylic acid containing polymers (1997)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 18 (1997), S. 385-391 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A novel synthesis of linear acrylic acid containing polymers, poly(styrene-co-acrylic acid) and poly(acrylic acid), was accomplished through hydrolysis of the respective parent polymers, i.e. poly(styrene-co-methyl acrylate) and poly(methyl acrylate), with trimethylsilyl iodide under mild conditions. Combination of 1H NMR, 13C NMR, FTIR, DSC and chemical titration confirms that the conversion from methoxycarbonyl to carboxyl is almost complete. This method is further successfully applied to synthesize poly-(ethyl methacrylate-co-acrylic acid) through selective hydrolysis of the methyl acrylate units in poly(ethyl methacrylate-co-methyl acrylate).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1997.030180505
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  • 4
    Electronic Resource
    Electronic Resource
    New evidence of the presence of internal electron donors in active sites of heterogeneous Ziegler-Natta catalysts (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 17 (1996), S. 645-651 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(propylene) samples produced by heterogeneous Ziegler-Natta catalysts containing different internal electron donors were fractionated by using temperature rising elution fractionation; some key fractions were analyzed with 13C NMR. It was found that internal electron donors with different structures can convert aspecific active sites into different isospectrific ones. The employment of bis(2-ethylhexyl) phthalate as internal electron donor leads to chemically inverted structures in the atactic fraction. This suggests that an internal electron donor may also exist in the environment of aspecific active sites.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1996.030170906
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of epinine in human urine by high-performance liquid chromatography coupled with electrochemical detection using carbon fiber microelectrodes (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 1147-1149 
    Details
    ISSN: 1040-0397
    Keywords: Epinine ; Carbon fiber ; Microelectrode ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Epinine was detected with a simple and disposable carbon fiber flow electrode after being separated by high-performance liquid chromatography (HPLC). An alumina adsorption procedure was used for the extraction of epinine from urine samples. The extraction recoveries at 1, 3, and 6 μg/mL epinine concentration levels were 66.9 ± 3.7, 65.6 ± 3.3, and 67.0 ± 3.4%, respectively (n = 5). Linear responses to epinine in urine were obtained over the range of 0 to 10 μg/mL. The detection limit (signal-to-noise ratio = 5/1) for epinine in urine was 15 ng/mL.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140061139
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  • 6
    Electronic Resource
    Electronic Resource
    Backscattering Factor for KLL Auger Yield from Film-Substrate Systems (1996)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 24 (1996), S. 15-22 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Backscattering factor (R) between primary energies of 2-40 keV for film-substrate KLL Auger backscattering yield (RFS) is calculated via Monte Carlo simulation for C and Al films. Substrates ranging from Be (Z=4.0) to Au (Z=79.0) are used in the study. Results via a normalizedRFS (RN) function show that substrate effects are indeed present. This is especially so at higher primary energies and lower film atomic number. Electron range results also show that an important and meaningful quantity to describe the backscattering Auger yield with respect to film thickness is the mean backscattered energy penetration depth. This is found to be essentially different from the half-maximum electron range as proposed earlier. A power law can be used to describe the half-value range (i.e. the thickness for whichRN=0.5) with respect to primary energy. For Al film, however, a discontinuity in the power law is found for energies 〈4 keV. This is attributed mainly to the relatively large binding energy of the Al K-shell and also to the greater variation of the K-shell cross-section within the backscattered energy spectrum. A new analytical interpolation formula is proposed to calculateRFS. This model accounts for substrate effects at only primary energies 〉4 keV. At lower energies mean values are used instead. Besides the fitted parameters from our results, known bulkR expressions for film and substrate are also required for the practical use of the model.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    In situ X-ray photoelectron spectroscopy of surfaces at pressures up to 1 mbar (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 15 (1990), S. 245-253 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: In this article we describe an x-ray photoelectron spectrometer that can either be used as an ultra-high vacuum instrument (p 〈 10-10 mbar) or, after insertion of a movable aperture, to analyse materials at ambient pressures up to 1 mbar. We will describe the basic design of the instrument, and the methods used to determine the pressure at the location of photoelectron ejection. One way to estimate the pressure is by attenuation of the substrate signal by the gas phase and comparing experimental with published ionization cross-sections; the second method uses condensation isobars. Examples are given for gas-phase spectra. Application of the instrument in surface science studies is demonstrated by two examples where surfaces were analysed under high-pressure conditions as a function of temperature, showing that the instrument allows steady-state equilibrium measurements of surface composition.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740150403
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  • 8
    Electronic Resource
    Electronic Resource
    Observations regarding the effect of deformation on the domain structure in segmented polyurethanes (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 18 (1980), S. 369-375 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.130180508
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  • 9
    Electronic Resource
    Electronic Resource
    Plasma polymerization of octafluorocyclobutane and hydrophobic microporous composite membranes for membrane distillation (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 46 (1992), S. 191-199 
    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: In this paper, hydrophilic microporous cellulose nitrate membranes have been surface-modified by plasma polymerization of octafluorocyclobutane (OFCB). The microporous composite membranes with a hydrophilic layer sandwiched between two hydrophobic layers have been obtained. The obtained composite membranes have been used in a membrane distillation (MD) process and have exhibited good performance. The effects of polymerization conditions, such as glow-discharge power and deposition time, on the structures and MD performances of the obtained composite membranes have been investigated by SEM, X-ray microscopical analysis, and XPS. The polymerization conditions should be as mild as possible in order to prepare the hydrophobic composite membrane with good MD performance. The typical MD behaviors of the obtained hydrophobic composite membranes are in agreement with that of hydrophobic membranes directly prepared from hydrophobic polymeric materials, like PVDF, PTFE, or PP.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070460201
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and reversible photocleavage of novel polyurethanes containing coumarin dimer components (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 613-624 
    Details
    ISSN: 0887-624X
    Keywords: anti head-to-head 7-hydroxycoumarin dimer ; anti head-to-tail 7-hydroxy-4-methylcoumarin dimer ; polyurethane ; photocleavage ; photopolymerization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Six polyurethanes containing coumarin dimer components in the main chain have been prepared by polyaddition of diisocyanates with anti head-to-head 7-hydroxycoumarin dimer or anti head-to-tail 7-hydroxy-4-methylcoumarin dimer. 7-Acetoxycoumarin and 7-acetoxy-4-methylcoumarin were first prepared and then photodimerized under 350 nm UV light to give anti head-to-head 7-acetoxycoumarin dimer and anti head-to-tail 7-acetoxy-4-methylcoumarin dimer, respectively. After hydrolyzing under acidic conditions to 7-hydroxycoumarin dimer and anti head-to-head 7-hydroxycoumarin dimer, they were polymerized with aliphatic and aromatic diisocyanates in N,N-dimethylacetamide to give the polyurethanes. Addition of dibutyltin dilaurate (T-12) as catalyst increases the polymer yield with the viscosity remaining almost unchanged. It was also found that lithium chloride enhances both the yield and viscosity of the polyurethanes by increasing their solubility possibly through complexation. The polyurethanes are symmetrically photocleaved at cyclobutane rings under 254 nm UV light to dicoumarins. Reversible photodimerization of the photocleaved compounds have also been investigated under 300 and 350 nm UV light. The polyurethanes from aromatic diisocyanates or with 4-methyl substituent exhibit greater reactivity in the photocleavage reaction. © 1997 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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