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  • Polymer and Materials Science  (15)
  • 32.30.Jc  (3)
  • J64
  • 1990-1994  (15)
  • 1980-1984  (3)
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Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Beam-foil lifetime study of Al-like titanium, iron and nickel (1990)
    Springer
    The European physical journal 17 (1990), S. 5-9 
    Details
    ISSN: 1434-6079
    Keywords: 32.70.Fw ; 34.50.Fa ; 32.30.Jc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The lifetimes of the resonance levels in the Al-like ions Ti X, Fe XIV and Ni XVI have been obtained from beam-foil measurements using a variety of analytical techniques. The spectral analysis and identification of cascade transitions necessary for application of the ANDC procedure have been aided by recent observations of laser-produced plasmas. The lifetime values obtained from ANDC analyses for the 3s 3p 2 doublet levels agree well with predictions based on semi-empirical Hartree-Fock calculations. However, the ANDC results for the 3s 2 3d levels fall between the values obtained using multi-exponential curve-fitting and from the calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437489
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  • 2
    Electronic Resource
    Electronic Resource
    EUV-spectroscopy of beam-foil excited 14.25 MeV/u Xe52 + ... Xe49 + -ions (1992)
    Springer
    The European physical journal 22 (1992), S. 693-697 
    Details
    ISSN: 1434-6079
    Keywords: 32.30.Jc ; 12.20.Fv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 14.25 MeV/u Xe — ions with chargesq=52, 51, 50 and 49 were sent through carbon foils of 50 µg/cm2. Beam — foil spectra between 6 nm and 14 nm were registered using the GSI 5 m grazing incidence spectrometer. The spectra are dominated by Rydberg transitions from levels withn from 12 to 7. As weak features, 2s − 2p transitions in Li- and Be-like ions were observed. Their wavelengths were determined with an accuracy of 0.02 nm using modelled Rydberg lines for the wavelength scale calibration. Very good agreement with experimental and theoretical results was obtained. The present limitation for the use of Rydberg lines for an in-situ Doppler shift corrected calibration is emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437250
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  • 3
    Electronic Resource
    Electronic Resource
    Thermodynamics of mixing of ethylene oxide oligomers with different end groups in tetrachloromethane: theoretical treatment (1992)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Theory and Simulations 1 (1992), S. 233-243 
    Details
    ISSN: 1018-5054
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In a previous paper we reported the enthalpies of mixing of oligomers of ethylene oxide with different end groups in tetrachloromethane. This paper shows the applicability of the modified theoretical treatment, based on a quasichemical equilibrium of the contacting segmental surfaces originated from Huggins, to our experimental results. The experimental data of ethylene oxide oligomers with methoxy end groups can be described with the energy parameter Δεαβ, the equilibrium constant Kαβ and the surface ratio rσ assuming a chemically uniform surface of the oligomer in CCI4. Ethylene oxides with strong polar OH end groups can be treated successfully with an extended version of the theory with two additional parameters K and ΔΔε for systems containing three different kinds of chemical units.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mats.1992.040010404
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  • 4
    Electronic Resource
    Electronic Resource
    Mesomorphic flexible chain polymers based on silicon (1994)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 5 (1994), S. 796-804 
    Details
    ISSN: 1042-7147
    Keywords: Poly(dialkylsiloxane) ; Polysilane ; Polysilylene ; Columnar 2D-ordering ; Mesophases ; 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: Poly(dialkylsiloxane)s and poly(dialkylsilane)s form a similar type of columnar mesophase. Although, the polysilanes are stiffer than polysiloxanes, both classes of polymers may be considered to be flexible due to the ability to form chain-folded crystals. Chain flexibility rather than the presence of chain stiffness determines whether the columnar mesophase is formed. A certain amphiphilic character does not appear to be required, as polysiloxanes with short side groups, e.g. polydiethylsiloxane display the same mesophase behaviour as polydialkylsilanes with long side chains and other nonpolar flexible chain molecules. The importance of the entropy gain upon conformational disordering is reflected in the increase in temperature stability with increasing alkyl side group length and the absence of mesophase behaviour in the case of the dimethyl substituted polymers
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1994.220051205
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  • 5
    Electronic Resource
    Electronic Resource
    An FTIR solid-state analysis of the diffusion of hindered phenols in low-density polyethylene (LDPE): The effect of molecular size on the diffusion coefficient (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 895-903 
    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: Low-density polyethylene (LDPE) has been investigated with respect to the diffusion of hindered phenol antioxidants added to the polymer matrix. In the study, a simple method was used to measure the diffusion coeficient, with the aid of FTIR spectroscopy without any extraction or refining steps in the analysis. The diffusion coefficient, D, of five phenols containing the same 3(3,5-di-tert-butyl-4-hydroxyphenyl) structure but with different lengths of the hydrocarbon tail were obtained in the temperature range 30-60°C. The number of carbon atoms in the tail varied between 1 and 18. It was found that the logarithm of D decreased linearly with increasing molecular size. The temperature-dependence of the phenols could be described by an Arrhenius-type relationship. It was found that the activation energy, Ed, incresed linearly with increasing molecular size. © 1994 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070510512
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  • 6
    Electronic Resource
    Electronic Resource
    Quest for experimental M1 and E1-intercombination transition probabilities in few-electron Xe ions (1991)
    Springer
    The European physical journal 18 (1991), S. 223-229 
    Details
    ISSN: 1434-6079
    Keywords: 32.30.Jc ; 34.50. Fa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The experimental access to M1 transition probabilities within thens 2 np k (1 ≦k ≦ 5) ground state configurations of highly ionized atoms is outlined. A test experiment on Xe(45–50)+ yielded first spectra and decay curves of the 2s 2 1 S 0 − 2s2p 3 P 1 0 intercombination transition in Xe50+ and of M1 transitions within the 2s 2 2p k (1 ≦k ≦ 5) ground configurations. The data compare well only with theoretical predictions which take the Lamb shift into account. Problems and prospects for better measurements are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437075
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  • 7
    Electronic Resource
    Electronic Resource
    Macromolecular conformation studies by variable temperature 13C and 29SI-NMR magic angle spinning (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 7 (1984), S. 63-85 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.020071984105
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  • 8
    Electronic Resource
    Electronic Resource
    Observation of a nematic phase displayed by a polysiloxane with trinitrofluorenones as side groups (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 2659-2668 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis and the results of the structural study of two copolysiloxanes with laterally fixed trinitrofluorenone (TNF) units is reported. The two copolysiloxanes having 2,4 (1a) and 5,3 (1b) dimethylsiloxane comonomer units per TNF side group differ significantly in their phase behaviour as evident from optical microscopy, differential scanning calorimetry and X-ray scattering: 1b shows a nematic mesophase whereas 1a is an amorphous material. The different phase behaviour is discussed in terms of microphase separation between the siloxane backbone and TNF side groups.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1992.021931014
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  • 9
    Electronic Resource
    Electronic Resource
    Thermodynamics of mixing of ethylene oxide oligomers with different endgroups in tetrachloromethaneDedicated to Prof. Dr. Robert Kerber on the occasion of his 65th birthday (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 2929-2947 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Enthalpies and Gibbs energies of mixing of liquid ethylene oxide oligomers with hydroxyl and methoxy end groups in tetrachloromethane are obtained by microcalorimetry and vapour pressure measurements. In this part of the publication the thermodynamic excess quantities ΔH, ΔGE and ΔSE are fitted by power series as functions of the weight fraction. Polymer- and solvent-specific as well as partial thermodynamic quantities are deduced. The qualitative explanation of the strongly end group specific mixing behaviour demonstrated by these quantities is based on the induced dipol interactions of the ethylene oxide middle segments and on the hydrogen bond interactions of the OH end groups.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021911209
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis of poly(vinyl ether)s with perfluoroalkyl pendant groups (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 275-284 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 2-Perfluoro(alkyl)ethyl vinyl ethers, F(CF2)nCH2CH2OCH=CH2, (n = 6 or 8), were synthesized and polymerized by means of cationic initiators (HI/ZnI2 and CF3SO3H/(CH3)2S). The perfluorohexyl-substituted poly(vinyl ether) is completely amorphous. The polymer with perfluorooctyl segments shows side chain crystallization with a disordering transition. For the corresponding perfluorooctyl monomer a liquid-crystalline phase was observed before melting. Copolymerization experiments of the flurocarbon-segmented monomers with a vinyl ether containing a cyanobiphenyl group in the side chain did not give homogeneous copolymers. This is attributed to the slower rate of polymerization of the fluorinated vinyl ethers as compared with the liquid-crystalline comonomer.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1992.021930125
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