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  • 1
    Electronic Resource
    Electronic Resource
    The percolation-to-cluster transition during spinodal decomposition of an off-critical polymer mixture. Observation by light scattering and optical microscopy (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 7181-7184 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Direct observation of the percolation-to-cluster transition of an off-critical mixture of polybutadiene and polyisoprene was achieved by optical microscopy. According to optical evidence, the transition occurs in a slow and a fast step not revealed in parallel light scattering experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468304
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  • 2
    Electronic Resource
    Electronic Resource
    Mc determination and molecular dynamics in crosslinked 1,4-cis-polybutadiene: a comparison of transversal proton and deuterium NMR relaxation (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 3624-3628 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00040a003
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  • 3
    Electronic Resource
    Electronic Resource
    Small-angle neutron scattering investigation of a multilinked polybutadiene network crosslinked in solution (1991)
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 1269-1274 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00006a009
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  • 4
    Electronic Resource
    Electronic Resource
    Micro- and macroconformation of macromolecules (1981)
    Springer
    Polymer bulletin 6 (1981), S. 93-100 
    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 first results are reported about the conformational analysis of an amorphous polymer in the glassy state by means of proton enhanced variable-temperature magic angle spinning 13C NMR experiments. In amorphous threodiisotactic poly(1,2-dimethyltetramethylene) at 220 K different conformational diads could be resolved and assigned. From the spectrum of the glassy polymer the shift increment associated with a conformational change of main chain bonds from anti to gauche is determined. In addition the populations of the conformations of CH-CH bonds and of CH-CH-CH2 bond pairs of poly(1,2-dimethyltetramethylene)s are determined in the glassy state and energy differences between these conformations are estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256510
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  • 5
    Electronic Resource
    Electronic Resource
    Concentration dependence of local chain motions of polymers (1981)
    Springer
    Polymer bulletin 6 (1981), S. 113-119 
    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 chain dynamics of an alternating 1,4-trans-butadiene-propene copolymer has been investigated by high resolution 13C NMR spectroscopy in a broad range of concentrations in solution and in the melt. While in semidilute solution all main chain carbon atoms have the same activation energy of motion it is found that, above a concentration of 20 wt%, the activation energy of the aliphatic carbon atoms increases faster with concentration than the activation energy of the olefinic carbon atoms. It is concluded that in dilute and in semidilute solution all carbon atoms are relaxed by localized transitions about methine-methylene bonds, i. e. the bonds with the lowest energy barrier, whereas in concentrated solution and in the melt the relaxation of aliphatic and olefinic carbon atoms is controlled by independent localized transitions about methylene-methylene and methine-methylene bonds, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256513
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  • 6
    Electronic Resource
    Electronic Resource
    Blockpolymers of styrene and isoprene with variable interphase: Morphology and dynamic viscoelastic behaviour (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 15-25 
    Details
    ISSN: 1435-1536
    Keywords: Blockpolymer ; interphase ; electron microscopy ; dynamic viscoelastic behaviour ; mechanical model calculation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A method is described to prepare poly[isoprene-b-(isoprene-co-styrene)-b-styrene] threeblock polymers with variable interphase thickness by anionic polymerization. At constant overall molecular weight the total interlayer content multiply exceeds that of normal blockpolymers. At high copolymer content three-phase systems are obtained. The morphology is examined by electron microscopy under various staining conditions. The dynamic viscoelastic behaviour, determined with torsion pendulum experiment, has been simulated for lamellar two-and three-phase systems with different contents of copolymer material. A new interpretation of theT g depression of the hard phase is given in terms of a cooperative softening of the pure hard phase and surface interlayer material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411513
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of phase separation on network and viscoelastic properties in SBS thermoplastic elastomers (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 215-223 
    Details
    ISSN: 1435-1536
    Keywords: Blockpolymers ; stress relaxation ; interphase ; mechanical models ; equilibrium modulus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Stress relaxation of poly(styrene-b-butadiene-b-styrene) thermoplastic elastomers is studied in dependence of molecular weight and degree of hydrogenation in the temperature range between −30° and +80 °C. The influence of these parameters on the structure of the physical network and the degree of partial mixing in the domain boundary is investigated by separating the stress-relaxation modulus into a viscoelastic term and an equilibrium network modulus calculated from the relaxation-time spectrum. The temperature dependence of the one-second relaxation modulus is quantitatively described by use of a modified Kerner model for the simulation of the viscoelastic term. The modification allows the estimation of the volume fraction of interfacial material and its correlation to the parameters which govern phase separation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01469666
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  • 8
    Electronic Resource
    Electronic Resource
    Stress induced crystallization in thermoplastic elastomers (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 323-331 
    Details
    ISSN: 1435-1536
    Keywords: Block copolymers ; stress induced crystallization ; relaxation behaviour ; crystallization kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Thermoplastic elastomers show considerable flow if they are subjected to large strains. To investigate the influence of stress induced crystallization, elastomers showing stress induced crystallization are synthesized by hydrogenation of poly(butadienes) and poly(styrene-b-butadiene-b-styrene) block polymers. The influence of the methylene sequence length on the crystallization behaviour is evaluated. From stress relaxation experiments, the crystallization kinetic is analyzed. Heterogeneous nucleation and fibrillar crystal growth is detected for all block polymer systems. The kinetic behaviour is described by a preorientation of elastomer chains near the domain surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418191
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  • 9
    Electronic Resource
    Electronic Resource
    Diffuse phase boundary in blockcopolymers-comparison of mechanical model results with thermodynamic theory (1984)
    Springer
    Colloid & polymer science 262 (1984), S. 466-469 
    Details
    ISSN: 1435-1536
    Keywords: blockcopolymers ; interphase ; phase separation ; thermodynamic theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract From mechanical model calculations the ratio of domain radius and interfacial thickness in SBS-blockcopolymers is obtained. The results for blockcopolymer systems varying in molecular weight and polymer-polymer interaction parameter are compared with predictions of the statistical thermodynamic theory. For the absolute value of the interfacial thickness values of 3 nm and 2 nm are calculated for nonhydrogenated and partially hydrogenated blockcopolymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412042
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  • 10
    Electronic Resource
    Electronic Resource
    Polybutadiene model networks —synthesis, mechanical characterization and comparison with rubber elasticity models (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 544-558 
    Details
    ISSN: 1435-1536
    Keywords: Polybutadiene ; random crosslinking ; rubber elasticity ; trapped entanglements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Model networks of defined crosslink density are prepared via nonradical statistical crosslinking of polybutadiene in bulk and concentrated solution using a masked bistriazolinedione as crosslinker. The kinetics of crosslinking is monitored by FT-IR-spectroscopy. The reaction follows pseudo-1st-order reaction kinetics. The activation parameter of the crosslinking reaction is estimated from crosslinking at various temperatures. Networks of deuterated polybutadiene are prepared by this reaction in a wide range of crosslink densities. The stress strain behavior is analyzed according to the Junction Constraint-Theory of rubber elasticity (JCT) and to the approach introduced by Graessley accounting for trapped topological constraints. The analysis clearly demonstrates that trapped entanglements contribute to the mechanically effective cycle rank, i.e., to the modulus in this system in the small and large strain limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658684
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