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  • 1
    Electronic Resource
    Electronic Resource
    Role of hydrophobic bonding in the contraction of nylon 66 in phenolic solutions (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 1191-1199 
    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: Rate constants for intermolecular bond breaking (k1) and bond re-formation (k2) were calculated from contraction measurements. Variation of ΔH
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070130608
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  • 2
    Electronic Resource
    Electronic Resource
    Relativistic oscillator strengths for transitions in the principal spectral series of the silver isoelectronic sequence (1995)
    Springer
    The European physical journal 35 (1995), S. 239-246 
    Details
    ISSN: 1434-6079
    Keywords: 32.70.Cs ; 32.30.-r ; 32.80.-t
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In a very recent paper [1] we have reported oscillator strengths for fine structure transitions between levels belonging to the diffuse and sharp spectral series in the silver isoelectronic sequence. The calculations were performed with the quantum defect orbital method in both their non-relativistic (QDO) and relativistic (RQDO) formulations, with both implicit and explicit allowance for core-valence polarisation. We now present a parallel study of transitions belonging to thens 2 S−n′2 P(n=5, 6;n′=5−10) spectral series of the AgI sequence, up toZ=63 in some cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01745526
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  • 3
    Electronic Resource
    Electronic Resource
    Numerical analysis of lamellar thickness distributions (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 27 (1989), S. 967-991 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A comparison of crystallite thickness distributions, as obtained from thin section electron microscopy, small-angle x-ray scattering, and low-frequency Raman acoustical model (LAM), is discussed in detail. It is shown with the aid of a large number of examples that a reliable numerical estimate of crystal thicknesses and long spacings is a complex problem. The values that are obtained by the different experimental techniques depend not only on the crystallite morphology, such as curvature and lateral extension, but very specifically, and crucially, on the nature of the thickness distribution. A series of widely different types of size distributions have been developed by controlling the molecular weight and crystallization temperature. Studies of these distributions, by the aforementioned experimental techniques, have revealed the reasons when and why agreement or disagreement is obtained in the determination of the crystallite thickness distribution.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1989.090270502
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  • 4
    Electronic Resource
    Electronic Resource
    A quantitative electron microscopic study of the crystalline structure of ethylene copolymers (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 1283-1302 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Quantitative thin-section electron microscope studies were made on compositional fractions of ethylene copolymers crystallized under several extreme conditions. The co-units chosen were such that the chains contained either ethyl, hexyl, or acetate side groups. Certain general features are independent of the chemical nature of the co-unit. It was found that up to about 2 mol % co-unit content lamellae are observed in all copolymers which were slowly cooled from the melt. The lateral dimensions of lamellae are not as large as in corresponding homopolymers and the lamellae are segmented. As the branch content increases the lamellae become shorter and eventually degrade into small crystallites. Within this broad outline of behavior, differences between the copolymer types are discerned and discussed. By comparison with the Raman LAM it is shown that quantitative values for the crystallite size distribution are obtained by the electron microscopy method used. Furthermore, when the specimen consisted of well-ordered lamellar stacks the degree of crystallinity obtained from the electron micrographs was in quantitative agreement with the enthalpy of fusion.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090240608
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetics of phase separation in polymer blends for deep quenches (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 723-751 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Electro microscopy was used to study the phase separation kinetics of a polystyrene/polyvinylmethylether system subjected to a critical deep quench. The size of the phase-separated domains was found to increase linearly with time, implying that hydrodynamic effects control the rate of growth of the domains in the time scale and temperature range under consideration. From these measurements the growth velocity and approximate diffusion constants can be determined for three different temperatures. Comparison of these results with those obtained by light scattering on other systems and with theoretical predictions is possible by replotting in dimensionless units.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090240401
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  • 6
    Electronic Resource
    Electronic Resource
    A comparison of the Raman LAM and electron microscopy in determining crystallite thickness distributions: Polyethylenes with narrow size distributions (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 27 (1989), S. 957-965 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A detailed quantitative comparison between thin section electron microscopy, utilizing the chlorosulfonation technique, and the Raman low-frequency acoustical mode (LAM) in determining the crystallite size distribution in polyethylenes having narrow distributions is made. Three different polyethylene systems have been analyzed, one of which was specifically prepared for this work. Very good quantitative agreement is obtained between these two analytical methods when account is taken of the chain tilt and the distribution is restrained to be narrow. Systems having broad crystallite size distributions introduce complexities into this comparison.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1989.090270501
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  • 7
    Electronic Resource
    Electronic Resource
    Relationship between microscopic and macroscopic structures of organic thin films for SHG (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 2 (1993), S. 245-268 
    Details
    ISSN: 1057-9257
    Keywords: Electron diffraction ; Non-linear optics ; Organic thin films ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The experiments described in this paper were undertaken in order to obtain information about the relationship between the structure and non-linear optical properties (second-harmonic generation) of organic thin films. For this purpose, two closely related dyes, diones and tetrones, were compared, both of which are shown to have large hyperpolarisabilities. Their microscopic properties are investigated by conformational analysis and electron diffraction. It could be shown that detailed knowledge about the structure and the adjacent neighbour packing can be obtained from conformational analysis and electron diffraction in order to understand the non-linear optical properties of the two dyes.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860020506
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  • 8
    Electronic Resource
    Electronic Resource
    Enolization of the phosphoryl groupDedicated to Professor Dr. Rolf Appel on the occasion of his seventieth birthday. (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 2 (1991), S. 613-628 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enolization of the phosphoryl group has been studied where Y = PPh3, CN, Ts, COOEt, CONEt2; R and R′ = Et, Bu, Ph, EtO, BuO, PhO; and X = Cl, Br, ClO4, BF4. It has been established that substances with are phosphaenols, but in substances with Y = CONEt2 the phosphoryl group cannot be enolized under any conditions. Phosphaenolization is favored by a high acidifying ability of the Y group, the ability of the X anion to stabilize the phosphaenolic form due to formation of a hydrogen bond OH…X with the anion, and a low electronegativity of R and R′ groups. To evaluate the acidifying ability of Y, this article defines specific σ- constants dependent on the number of substituents at the α-carbon atom: σCH3-, σCH2- and σCH-. Their sums characterize the enolization ability of the phosphoryl group. The enolic structure in the solid state is possible if ∑CHn- 〉 2. If this sum lies in the range of 2 〈 ∑CHn- 〈 2.6 the phosphoryl-phosphaenol tautomerism can be expected in appropriate solutions. Acidic properties of the investigated compounds in MeNO2 and EtOH (absolute) have been determined. Calculations of the acidity of the phosphoryl CH forms (A) and of the phosphaenol OH forms (B) have been carried out.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hc.520020603
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  • 9
    Electronic Resource
    Electronic Resource
    The use of liquid chromatography/thermospray mass spectrometry with on-line ultraviolet diode array and radiochemical detection: Characterization of the putative metabolites of U-78875 in female rat faeces (1994)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1994), S. 1-5 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The metabolites of an anxiolytic drug candidate U-78875 {3-(5-cyclopropyl-1,2,4-oxadiazol-3-yl)-5-(1-methylethyl)-imidazo[1,5-α]quinoxalin-4(5H)-one; I} were investigated in female rat faecal extracts following a single oral dose of (14C)I. Initial metabolite profiling was performed by high-performance liquid chromatography incorporating homogeneous (i.e. liquid scintillant added post-column) radiochemical detection (radio-HPLC). This indicated the presence of parent drug and one minor metabolite. Because liquid scintillant is incompatible with thermospray interfaces, subsequent analysis by thermospray/HPLC/MS (TSP/LC/MS) incorporated radiochemical detection in heterogeneous (i.e. solid scintillant) mode and ultraviolet (UV) diode array detection. This revealed that the peak thought previously to be parent drug contained two components: a metabolite (major) and parent drug (minor). The UV spectrum and TSP/LC/MS/MS daughter ion analysis led to the proposition of a bisamide structure for the major metabolite. Chemical synthesis was used to confirm this structure. TSP/LC/MS indicated that the molecular weight of the minor metabolite was 16 u higher than the bisamide, suggesting an oxidized analogue. Attempts to obtain a daughter ion spectrum on this minor metabolite proved unsuccessful. On-line radiochemical and UV diode array detection greatly facilitates the TSP/LC/MS characterization of metabolites from studies using radiolabelled drugs.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200230102
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetics of contraction of drawn nylon 66 in aqueous phenol (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 427-436 
    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: The rate of contraction of drawn nylon 66 in aqueous phenol was investigated, and a method is described for correlating this contraction with a series of elementary rate processes. The rate constants so obtained were analyzed by absolute rate theory, and the variations of ΔH† and ΔS† with phenol concentration gave evidence of the nature of the reaction steps.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070130303
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