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  • Articles  (56,733)
  • Springer  (44,254)
  • American Geophysical Union  (6,025)
  • American Meteorological Society  (4,429)
  • American Chemical Society (ACS)
  • National Academy of Sciences
  • 2015-2019  (31,246)
  • 2005-2009
  • 1990-1994
  • 1980-1984  (25,487)
  • 2017  (31,246)
  • 1984  (12,903)
  • 1983  (12,584)
  • Physics  (56,733)
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  • Articles  (56,733)
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  • 2015-2019  (31,246)
  • 2005-2009
  • 1990-1994
  • 1980-1984  (25,487)
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  • 1
    Electronic Resource
    Electronic Resource
    New telechelic polymers and sequential copolymers by polyfunctional initiator-transfer agents (inifers) (1983)
    Springer
    Polymer bulletin 9 (1983), S. 27-32 
    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 variety of primary and tertiary amino-telechelic polyisobutylenes have been synthesized quantitatively by various routes from alcohol-telechelic polyisobutylene. Thus the syntheses of α,ω-di(amino)-, α,ω-di-(N,N′-dimethylamino)-, and α,ω-di(N-phthalimido)polyisobutylenes have been achieved from α,ω-di(hydroxy)polyisobutylene with and without chain enlargement. Three different methods were used: an improved Gabriel synthesis, the reaction of ditosylester of α,ω-di(hydroxy)polyisobutylene with the potassium salt of unsubstituted and disubstituted ethanolamine, and the reduction of α,ω-di(cyanoethanol)polyisobutylene with LiAlH4 at room temperature. Analysis and characterization were done by gel permeation chromatography, IR and 1H-NMR spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275564
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  • 2
    Electronic Resource
    Electronic Resource
    Polymerization of acrylic acid initiated with poly-γ-mercaptopropylsiloxane (1983)
    Springer
    Polymer bulletin 9 (1983), S. 5-10 
    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 water soluble polyacrylic acid has been obtained by polymerization of acrylic acid initiated with silica-supported poly-γ-mercaptopropylsiloxane in the presence of water and carbon tetrachloride. A super absorbent sodium polyacrylate (water absorbing capacity 300 g/g) has been prepared by copolymerization of acrylic acid with a small amount of p-divinylbenzene with the same initiator in a mixture of aqueous sodium hydroxide solution, carbon tetrachloride, n-hexane and Tween 80.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275560
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  • 3
    Electronic Resource
    Electronic Resource
    Electrical transport in polystyrenesulfonate solutions (1983)
    Springer
    Polymer bulletin 9 (1983), S. 33-39 
    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 Electric conductance and transport numbers of polyions were measured in aqueous polystyrenesulfonate solutions having different counterions, at concentrations from 2×10−3 to ∼ 10−1 basemol dm−3. From experimental data the extent of atmospheric binding of small ions to polyions was derived. The resulting fraction of free counterions was found to agree within ±5% with the coefficient of self diffusion calculated according to the theory of Jackson, Lifson, and Coriell. The molar conductance and the effective charge of the polyion were applied for the calculation of the hydrodynamic friction coefficient related to a monomer unit of the polyion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275565
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  • 4
    Electronic Resource
    Electronic Resource
    Spectroscopy of thermoactivated relaxation processes in butadiene-styrene copolymers in the elementary relaxator approach (1983)
    Springer
    Polymer bulletin 9 (1983), S. 40-46 
    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 thermoactivated relaxation processes resulting in untrapping of the carriers and in recombination luminescence are described by means of the sum of independent elementary relaxators. In order to describe an elementary relaxator distribution function following characteristics were obtained by the fractional glow technique: i) the mean activation energy, ii) the mean frequency factor, iii) the recombination intensity, iv) activation energy spectrum, v) and frequency factor spectrum for butadiene-styrene copolymer. Using the Boltzmann equation unusually large values of frequency factor and activation energy were obtained, giving evidence that molecular motions γ, α exist in some temperature regions and therefore, that another desciption would be necessary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275566
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  • 5
    Electronic Resource
    Electronic Resource
    Phase diagram and conductivity of the polymer electrolyte: PEORLiCF3SO3 (1983)
    Springer
    Polymer bulletin 9 (1983), S. 47-51 
    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 simple model for the concentration dependence of the electrical conductivity of the polymer electrolyte: poly(ethyleneoxide) — LiCF3SO3 is presented. It is assumed that the crystals with stoichiometry: 4 polymer oxygens to 1 lithiumion are insulating and the surrounding conducting solution is saturated in the 4∶1 crystals. Correcting the space available for conduction with a volume correction factor accounts qualitatively for the concentration dependence of the conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275567
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  • 6
    Electronic Resource
    Electronic Resource
    Temperature dependence of the intensity of fluorescence of poly(n-vinylcarbazole) films (1983)
    Springer
    Polymer bulletin 9 (1983), S. 52-59 
    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 fluorescence spectra of thin films of poly(N-vinylcarbazole), PVCA, were measured at temperatures between 103 K and 535 K by constant excitation light intensity. Below 300 K, the corrected spectra were divided into bands belonging to different emitting species of PVCA. Temperature changes of the intensity of fluorescence of the two main excitation energy traps in PVCA are discussed using the simplified kinetic model of Johnson. Local anomalies on the curves of intensity of excimer fluorescence versus temperature measured at constant wavelength reflex the γ- and δ- relaxation regions in PVCA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275568
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  • 7
    Electronic Resource
    Electronic Resource
    Crystalline domains as trapping states in amorphous materials (1983)
    Springer
    Polymer bulletin 9 (1983), S. 60-66 
    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 photoconductivity and thermostimulated currents were measured on amorphous and spherulitic layers of oligo(ethyleneoxy) 2,5-di(anilino)terephthalate. The crystalline domains in the amorphous phase form new traps, c. 0,6 eV deep.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275569
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  • 8
    Electronic Resource
    Electronic Resource
    The determination of hard segments in polyurethane elastomers by high performance liquid chromatography (1983)
    Springer
    Polymer bulletin 9 (1983), S. 81-84 
    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 Reverse phase HPLC methods are elaborated for the characterisation of polyursthane elastomers. The quantitation of urethane groups after aminolysis, as well as the determination of basic hard segments and qualitative hard segments size distribution after hydrolysis in dimethylsulfoxid (DMSO) are described. The methods are ilustrated with diphenylmethane-p,p′-bis(4-octanoiloxybutylcarbamate) (U1) as model compound and three different polyurethane formulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275572
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  • 9
    Electronic Resource
    Electronic Resource
    Comparison of intramolecular complexation in several charge transfer complexes copolymers (1983)
    Springer
    Polymer bulletin 9 (1983), S. 67-74 
    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 Another representation of the chemical shift of the acceptor structural units' protons in the NMR spectra is proposed in order to make possible direct comparison between intramolecular complexation in intramolecular charge transfer complexes obtained by copolymerization. The influence of synthesis conditions and comonomer type on the intramolecular complexation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275570
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  • 10
    Electronic Resource
    Electronic Resource
    Observations of shish-kebabs in solvent-treated fracture surfaces of polyethylene (1983)
    Springer
    Polymer bulletin 9 (1983), S. 85-89 
    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 Shish-kebabs are observed by scanning electron microscopy on fracture surfaces of a low molecular weight, high-density polyethylene treated by hot pxylene. The shish-kebabs observed originate from the fibrils of the fracture surface. It is suggested that the larger fibrils are partially dissolved and that the partially dissolved molecules recrystallize on cooling forming the lamellar-like structures of the shish-kebabs. The less developed fibrils of the fracture surface dissolve completely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275573
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