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  • Articles  (52)
  • Springer  (39)
  • Wiley-Blackwell  (13)
  • 1980-1984  (52)
  • Physics  (52)
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  • Articles  (52)
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  • 1
    Electronic Resource
    Electronic Resource
    Quantitative evaluation of polymeric photosensitizers (1982)
    Springer
    Polymer bulletin 8 (1982), S. 369-375 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The energy transfer ability of free and polymer-bound acetophenone and benzophenone has been studied. The polymeric sensitizers were prepared by acetylation or benzoylation of atactic polystyrene (¯Mn=67.000). Trans-cis isomerization of stilbene, monitored by UV-spectrophotometry, has enabled the energy transfer process to be probed. The values of the Stern-Volmer constants, determined by following this technique, indicate that the energy transfer efficiency of both ketones is higher when they are in free state than when they are polymer-bound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264928
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  • 2
    Electronic Resource
    Electronic Resource
    Solution polymerization of phosphonitrilic chloride trimer in chlorobenzene (1982)
    Springer
    Polymer bulletin 6 (1982), S. 535-539 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The solution polymerization of phosphonitrilic chloride trimer has been studied by using 50% by weight monomer in Chlorobenzene. Polymerization reactions were conducted at temperatures between 198° and 240°C, and reaction times ranged from 12 to 96 h. Mostly soluble polymer was obtained up to a conversion of 30%. insoluble product was detected only above 240°C and 72 h. of reaction time. Polymers were characterised by intrinsic viscosity and weight average molecular weight, Mw, by light scattering (Zimm plot).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256375
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of chlorosulfonation on the surface mechanical properties of lamellar polyethylene (1983)
    Springer
    Polymer bulletin 10 (1983), S. 553-557 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The hardening of lamellar polyethylene (PE) as a consequence of a controlled chlorosulfonation treatment has been studied using the microindentation technique. The hardness of the polymer turns out to be a linear function of the density of treated PE. The rate of increase is larger for samples with higher crystallinity. This increase is related to the hardening of crystal lamellae due to the surface attachment of electron dense groups. The latter impede the slippage of crystals and substantially reduce the rate of creep of the material under the contact pressure applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285375
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  • 4
    Electronic Resource
    Electronic Resource
    Selective elimination reaction on PVC with potassium tert-butylate (1983)
    Springer
    Polymer bulletin 10 (1983), S. 206-209 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Three samples of PVC, having different tacticities, were treated with potassium tert-butylate under mild conditions. By means of 13C-NMR measurements, the elimination reaction was demonstrated to occur selectively by a small fraction of isotactic and heterotactic triads. On the other hand, the elimination was shown to give rise to a definite type of polyenes which absorb at 240 nm in the UV-Visible spectrum. The intensity of this band was proved to be higher as the overall isotactic content of the polymer increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272225
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  • 5
    Electronic Resource
    Electronic Resource
    Lamellar structure in melt crystallized low density polyethylene (1984)
    Springer
    Polymer bulletin 12 (1984), S. 269-274 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A combined X-ray diffraction and DSC investigation of the crystalline phase in lamellar low density polyethylene after conventional chlorosulfonation treatment has been carried out. Our results indicate that the acid attack does not involve any heavy group penetration within the lattice. The location of these groups at the basal crystal surface contributes, however, to an enhancement of the melting temperature of the modified lamellae. It turns out that the destruction level of crystalline material at 45°C, after 15–20 h is of the order of 20% and progressively increases for longer periods of time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275978
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  • 6
    Electronic Resource
    Electronic Resource
    Long periods in melt crystallized polyethylene two coexisting structures? (1980)
    Springer
    Polymer bulletin 3 (1980), S. 7-12 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary New small angle X-ray diffraction data of a series of mostly low density PE samples isothermally crystallized from the melt are reported to discern between the existing ambiguities concerning the alternative of one or two lamellar periodicities. The ratio of X-ray spacings turns out to be dependent on the supercooling of the samples. This result together with the analysis of the 1st and 2nd diffraction peaks during and after heat treatments reveals that the two scattering maxima in the samples investigated most probably originate from the coexistence of two different lamellar periodicities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263199
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  • 7
    Electronic Resource
    Electronic Resource
    Collision orbits in the oblate planet problem (1984)
    Springer
    Celestial mechanics and dynamical astronomy 33 (1984), S. 375-383 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Some of the properties of the oblate planet problem are derived. We use the technique of blowing up the singularity to study the collision orbits. We define some families of them in terms of their asymptotic behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01241051
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of the Wigner-Seitz boundary conditions on internal conversion coefficients (1984)
    Springer
    The European physical journal 316 (1984), S. 251-254 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid state effects are taken into account in an internal conversion coefficients computation by using Wigner-Seitz boundary conditions. Both the bound and free electron wave functions are calculated from an atomic Dirac-Hartree-Fock-Slater self consistent potential. These internal conversion coefficients are compared with those obtained from the usual free atom boundary conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439896
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  • 9
    Electronic Resource
    Electronic Resource
    Asymptotic fields for the quantum nonlinear Schrödinger equation with attractive coupling (1984)
    Springer
    Letters in mathematical physics 8 (1984), S. 111-117 
    Details
    ISSN: 1573-0530
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The quantum nonlinear Schrödinger equation with attractive coupling is considered through the quantum inverse scattering method. The asymptotic fields arising in this model are characterized in terms of scattering data operators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406393
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  • 10
    Electronic Resource
    Electronic Resource
    A new infinite-dimensional Kirillov's structure related with nonlinear evolution equations (1981)
    Springer
    Letters in mathematical physics 5 (1981), S. 99-103 
    Details
    ISSN: 1573-0530
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract An infinite-dimensional Lie algebra is presented whose associated Kirillov's operator leads to a Hamiltonian structure arising in the analysis of certain nonlinear evolution equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00403237
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